volcanic-activity (4)

Earth Watch Report - Volcanic Activity

 

.....

RSOE EDIS

Volcano Eruption Ecuador Andes, [Reventador volcano] Damage level Details

 

.....

Volcano Eruption in Ecuador on Thursday, 27 March, 2014 at 04:08 (04:08 AM) UTC.

Description
The volcano has entered a new eruptive phase since yesterday, Ecuador's Institute of Geophysics (IGP) reported. Starting from 15:00 local time yesterday, increasing tremor was registered and steady ash emissions were observed. At night, incandescent blocks could be seen and heard rolling down from the crater where probably a new lava dome has started to appear. Small pyroclastic flows descended on the eastern, southeastern and southern flanks of the volcano, probably as a result of re-mobilization of fresh lava and tephra deposits. These so-called secondary pyroclastic flows reached lengths of 500 m below the summit. IGP assumes the most likely scenario for the evolution of the new eruptive episode is that activity continues at similar levels for a while. So far, lava avalanches and pyroclastic flows have been confined within the caldera, near the flanks of the main cone. So far, no reports of ash falls became available from communities in the nearby areas, suggesting that the eruption is still small. An important hazard remains in the form of lahars (mud flows), which can be generated by re-mobilization of loose material during heavy rainfall and would most likely threaten the bed and banks of the Quijo river.

 

.....

VolcanoDiscovery's start page

Reventador volcano, Ecuador: news & activity updates

Reventador volcano (Ecuador): new eruption

Wednesday Mar 26, 2014 16:36 PM | BY: T

Continuous ash emission and incandescent avalanches on Reventador's eastern flank (image: G. Taipe / IGP)

Continuous ash emission and incandescent avalanches on Reventador's eastern flank (image: G. Taipe / IGP)

... IGP assumes the most likely scenario for the evolution of the new eruptive episode is that activity continues at similar levels for a while. So far, lava avalanches and pyroclastic flows have been confined within the caldera, near the flanks of the main cone. So far, no reports of ash falls became available from communities in the nearby areas, suggesting that the eruption is still small. An important hazard remains in the form of lahars (mud flows), which can be generated by re-mobilization of loose material during heavy rainfall and would most likely threaten the bed and banks of the Quijo river.

 

Read More Here

.....

 

 

Enhanced by Zemanta

Read more…

LISS Seismic Server & Volcanic Activity

Earth Watch Report – Friday August 31st, 2012

LISS – Live Internet Seismic Server

GSN Stations

These data update automatically every 30 minutes. Last update: August 31, 2012 08:19:06 UTC

Seismograms may take several moments to load. Click on a plot to see larger image.

CU/ANWB, Willy Bob, Antigua and Barbuda

ANWB 24hr plot

CU/BBGH, Gun Hill, Barbados

BBGH 24hr plot

CU/BCIP, Isla Barro Colorado, Panama

BCIP 24hr plot

CU/GRGR, Grenville, Grenada

GRGR 24hr plot

CU/GTBY, Guantanamo Bay, Cuba

GTBY 24hr plot

CU/MTDJ, Mount Denham, Jamaica

MTDJ 24hr plot

CU/TGUH, Tegucigalpa, Honduras

TGUH 24hr plot

IC/BJT, Baijiatuan, Beijing, China

BJT 24hr plot

IC/ENH, Enshi, China

ENH 24hr plot

IC/HIA, Hailar, Neimenggu Province, China

HIA 24hr plot

IC/LSA, Lhasa, China

LSA 24hr plot

IC/MDJ, Mudanjiang, China

MDJ 24hr plot

IC/QIZ, Qiongzhong, Guangduong Province, China

QIZ 24hr plot

IU/AFI, Afiamalu, Samoa

AFI 24hr plot

IU/ANMO, Albuquerque, New Mexico, USA

ANMO 24hr plot

IU/ANTO, Ankara, Turkey

ANTO 24hr plot

IU/BBSR, Bermuda

BBSR 24hr plot

IU/CASY, Casey, Antarctica

CASY 24hr plot

IU/CCM, Cathedral Cave, Missouri, USA

CCM 24hr plot

IU/CHTO, Chiang Mai, Thailand

CHTO 24hr plot

IU/COLA, College Outpost, Alaska, USA

COLA 24hr plot

IU/COR, Corvallis, Oregon, USA

COR 24hr plot

IU/CTAO, Charters Towers, Australia

CTAO 24hr plot

IU/DAV,Davao, Philippines

DAV 24hr plot

IU/DWPF,Disney Wilderness Preserve, Florida, USA

DWPF 24hr plot

IU/FUNA,Funafuti, Tuvalu

FUNA 24hr plot

IU/GNI, Garni, Armenia

GNI 24hr plot

IU/GRFO, Grafenberg, Germany

GRFO 24hr plot

IU/GUMO, Guam, Mariana Islands

GUMO 24hr plot

IU/HKT, Hockley, Texas, USA

HKT 24hr plot

IU/HNR, Honiara, Solomon Islands

HNR 24hr plot

IU/HRV, Adam Dziewonski Observatory (Oak Ridge), Massachusetts, USA

HRV 24hr plot

IU/INCN, Inchon, Republic of Korea

INCN 24hr plot

IU/JOHN, Johnston Island, Pacific Ocean

JOHN 24hr plot

IU/KBS, Ny-Alesund, Spitzbergen, Norway

KBS 24hr plot

IU/KEV, Kevo, Finland

KEV 24hr plot

IU/KIEV, Kiev, Ukraine

KIEV 24hr plot

IU/KIP, Kipapa, Hawaii, USA

KIP 24hr plot

IU/KMBO, Kilima Mbogo, Kenya

KMBO 24hr plot

IU/KNTN, Kanton Island, Kiribati

KNTN 24hr plot

IU/KONO, Kongsberg, Norway

KONO 24hr plot

IU/KOWA, Kowa, Mali

KOWA 24hr plot

IU/LCO, Las Campanas Astronomical Observatory, Chile

LCO 24hr plot

IU/LSZ, Lusaka, Zambia

LSZ 24hr plot

IU/LVC, Limon Verde, Chile

LVC 24hr plot

IU/MA2, Magadan, Russia

MA2 24hr plot

IU/MAJO, Matsushiro, Japan

MAJO 24hr plot

IU/MAKZ,Makanchi, Kazakhstan

MAKZ 24hr plot

IU/MBWA, Marble Bar, Western Australia

MBWA 24hr plot

IU/MIDW, Midway Island, Pacific Ocean, USA

MIDW 24hr plot

IU/NWAO, Narrogin, Australia

NWAO 24hr plot

IU/OTAV, Otavalo, Ecuador

OTAV 24hr plot

IU/PAB, San Pablo, Spain

PAB 24hr plot

IU/PAYG Puerto Ayora, Galapagos Islands

PAYG 24hr plot

IU/PET, Petropavlovsk, Russia

PET 24hr plot

IU/PMG, Port Moresby, Papua New Guinea

PMG 24hr plot

IU/PMSA, Palmer Station, Antarctica

PMSA 24hr plot

IU/POHA, Pohakaloa, Hawaii

POHA 24hr plot

IU/PTCN, Pitcairn Island, South Pacific

PTCN 24hr plot

IU/PTGA, Pitinga, Brazil

PTGA 24hr plot

IU/QSPA, South Pole, Antarctica

QSPA 24hr plot

IU/RAO, Raoul, Kermandec Islands

RAO 24hr plot

IU/RAR, Rarotonga, Cook Islands

RAR 24hr plot

IU/RCBR, Riachuelo, Brazil

RCBR 24hr plot

IU/RSSD, Black Hills, South Dakota, USA

RSSD 24hr plot

IU/SAML, Samuel, Brazil

SAML 24hr plot

IU/SBA, Scott Base, Antarctica

SBA 24hr plot

IU/SDV, Santo Domingo, Venezuela

SDV 24hr plot

IU/SFJD, Sondre Stromfjord, Greenland

SFJD 24hr plot

IU/SJG, San Juan, Puerto Rico

SJG 24hr plot

IU/SLBS, Sierra la Laguna Baja California Sur, Mexico

SLBS 24hr plot

IU/SNZO, South Karori, New Zealand

SNZO 24hr plot

IU/SSPA, Standing Stone, Pennsylvania USA

SSPA 24hr plot

IU/TARA, Tarawa Island, Republic of Kiribati

TARA 24hr plot

IU/TATO, Taipei, Taiwan

TATO 24hr plot

IU/TEIG, Tepich, Yucatan, Mexico

TEIG 24hr plot

IU/TIXI, Tiksi, Russia

TIXI 24hr plot

IU/TRIS, Tristan da Cunha, Atlantic Ocean

TRIS 24hr plot

IU/TRQA, Tornquist, Argentina

TRQA 24hr plot

IU/TSUM, Tsumeb, Namibia

TSUM 24hr plot

IU/TUC, Tucson, Arizona

TUC 24hr plot

IU/ULN, Ulaanbaatar, Mongolia

ULN 24hr plot

IU/WAKE, Wake Island, Pacific Ocean

WAKE 24hr plot

IU/WCI, Wyandotte Cave, Indiana, USA

WCI 24hr plot

IU/WVT, Waverly, Tennessee, USA

WVT 24hr plot

IU/XMAS, Kiritimati Island, Republic of Kiribati

XMAS 24hr plot

IU/YSS, Yuzhno Sakhalinsk, Russia

YSS 24hr plot

**********************************************************************************************************

Volcanic Activity

Earthquakes raise alert level at Alaska volcano

Alaska Dispatch

A series of small earthquakes which began Wednesday night and continued into Thursday near a long-dormant volcanic peak in Alaska’s Aleutian Islands has prompted researchers to raise the alert level for the Little Sitkin volcano.

The nearly 4,000-foot-high Little Sitkin volcano is named for the island where it resides, located in the Rat Islands in the Aleutian chain. The volcano has shown little activity since scientists have started observing it, with only three questionable eruptive events at the volcano since that time. The most recent eruption may have come in 1900, according to the Alaska Volcano Observatory.

Still, the AVO page for Little Sitkin mentions there may have been a “cataclysmic eruption” on the island sometime after the last ice age, which ended more than 11,000 years ago.

Seismic equipment located near the volcano began detecting a “swarm of high-frequency earthquakes” at about 7:15 p.m. Wednesday, the AVO reports. The earthquakes continued through the night into Thursday, prompting the alert level at the volcano being raised. The alert level is currently at yellow, which means that the “volcano is exhibiting signs of elevated unrest above known background level.” Additionally, aircraft traveling in the area are advised to exercise caution.

The volcano is located in a remote part of the Aleutians, about 35 miles northwest of the World War II outpost of Amchitka and 200 miles west of Adak.

Little Sitkin joins two other Alaska volcanoes, Iliamna and Cleveland, currently sitting at elevated alert levels.

Photos: Alaska volcanoes
Apr 02, 2012
Pavlof volcano and eruption plume on evening of Aug. 30, 2007. View is to the south. Plume height approximately 17-18,000 ft.
Chris Waythomas/Alaska Volcano Observatory photo

Iliamna, 130 miles from Anchorage, Alaska’s largest city, was first elevated in March of this year following a continued increase in seismic activity.

“The current level of activity at Iliamna does not indicate an imminent or certain eruption,” a status update from the AVO said Thursday. “Seismic activity, along with gas emissions, appear to be declining gradually.”

Meanwhile, the oft-erupting Cleveland volcano which, like Sitkin, is located in the Aleutians, remains elevated as well. Cleveland has been upgraded a half-dozen times in since 2010 alone, and most recently erupted in June, when a pilot reported an ash cloud reaching up to 35,000 feet. Cleveland sits at a higher alert level than Iliamna or Little Sitkin, meaning the volcano still has a higher potential for eruption at any time.

For updates on these and other volcanoes across Alaska, visit the Alaska Volcano Observatory.

Contact Ben Anderson at ben(at)alaskadispatch.com

Today Volcano Activity USA State of Alaska, [Little Sitkin Volcano] Damage level Details

Volcano Activity in USA on Friday, 31 August, 2012 at 02:27 (02:27 AM) UTC.

Description
Seismologists say a cluster of earthquakes has been detected at a remote volcano in Alaska’s western Aleutian Islands. The Alaska Volcano Observatory says the quakes began Wednesday evening at Little Sitkin Volcano and are continuing as of Thursday morning. No eruption has been detected. Scientist in charge John Power says there is no direct link to the swarm of earthquakes at Little Sitkin and a cluster of quakes that shook California’s Imperial County earlier this week. Powers says Little Sitkin is located on an uninhabited island and is far from any populated areas. He says the seismic activity is unusual for Little Sitkin, whose last eruption possibly in the early 1900s is questionable. Powers says the concern about an eruption would be the possible threat posed to aircraft.
Read more…

Earthquakes & Volcanic Activity

Earth Watch Report – Saturday August 25th, 2012

Earthquakes

RSOE EDIS

Date/Time (UTC) Magnitude Area Country State/Prov./Gov. Location Risk Source Details
25.08.2012 10:45:36 2.9 North America United States California Cobb There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 10:50:23 2.3 Europe Italy Calabria Salerni VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 10:35:34 2.1 North America United States Alaska Sterling VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 10:50:47 2.4 Europe Italy Calabria Salerni VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 10:40:33 3.4 Caribbean British Virgin Islands Road Town VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 09:50:19 4.1 Asia Turkey Manisa Golmarmara There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 09:20:57 2.3 North America United States California Big Bear Lake There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
25.08.2012 10:00:30 4.0 Caribbean British Virgin Islands Road Town VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 10:51:10 4.0 Caribbean Sea British Virgin Islands Road Town VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 10:52:02 3.9 Caribbean British Virgin Islands Road Town VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 08:52:29 2.3 North America United States California Saratoga VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
25.08.2012 08:30:56 2.8 North America United States Utah Big Water There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 08:50:20 3.8 Europe Greece Central Greece Roviai VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 08:50:51 2.9 Europe Greece Crete Kissamos VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 08:51:34 2.4 Europe Bosnia and Herzegovina Federation of Bosnia and Herzegovina Vitez VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 07:50:18 2.4 Europe Greece North Aegean Mithymna VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 06:45:26 3.1 South-America Chile Región Metropolitana La Pintana There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 05:55:33 2.8 North America United States California Avalon VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 07:50:43 2.3 Asia Turkey Amasya Dedekoy VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 07:51:04 3.8 Europe Russia Tyva Sukpak VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 07:51:25 2.6 Asia Turkey Antalya Kalkan VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 05:50:28 4.4 Pacific Ocean – West Vanuatu Torba Sola VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 06:45:45 4.4 Pacific Ocean – West Vanuatu Torba Sola VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 06:46:03 2.8 Asia Turkey Amasya Dedekoy VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 05:40:37 2.8 Asia Turkey Amasya Dedekoy VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 06:46:22 2.2 Asia Turkey Amasya Dedekoy VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 04:56:05 2.5 North America United States California Indianola VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 05:41:44 3.1 Europe Greece Crete Yialos VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 04:40:50 2.3 North America United States Alaska Petersville VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 04:40:21 2.5 Europe Italy Sicily Saponara Villafranca There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 03:40:20 2.7 Europe Romania Mehedin?i Svinita VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 03:40:44 3.5 Europe Greece Peloponnese Elafonisos VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 02:45:55 3.1 Caribbean U.S. Virgin Islands Saint Thomas Island Charlotte Amalie VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 03:41:10 4.1 Africa Algeria Chlef Sidi Akkacha VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 01:16:21 2.1 North America United States California Big Bear City There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
25.08.2012 06:16:00 2.2 North America United States Oregon Paisley VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 01:40:18 4.6 Indonesian Archipelago Indonesia Bengkulu Curup VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 01:41:38 4.7 Indonesian archipelago Indonesia Bengkulu Curup VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 01:40:46 2.4 Europe Italy Calabria Nicastro There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 01:41:11 4.4 South-America Chile Valparaíso San Antonio VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 00:50:57 4.7 South America Chile Valparaíso San Antonio VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 00:35:26 2.4 Europe Italy Abruzzo Balsorano Vecchio VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 00:35:51 3.0 Europe Greece North Aegean Agia Paraskevi VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 00:36:13 2.0 Europe Italy Lombardy Ospitaletto VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 00:05:27 3.9 North America United States Alaska Healy There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 00:36:34 4.7 Indonesian Archipelago Indonesia Aceh Meulaboh VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
25.08.2012 00:10:26 4.7 Indonesian archipelago Indonesia Aceh Meulaboh VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 00:36:55 2.6 Europe Italy Emilia-Romagna San Prospero VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 06:46:42 2.0 Asia Turkey Van Toyga There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 00:37:17 2.7 Asia Turkey Afyonkarahisar Kiziloren VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details

…………………………………………….

Four quakes rock Nepal in past 12 hours

National Seismological Centre has its stations across the country.

KESHAV P. KOIRALA

KATHMANDU: Four consecutive earthquakes — two of them powerful ones — rocked western Nepal in past 12 hours.

With their epicentres in the border area of Rolpa and Rukum districts, the tremors of the first quake were felt in Kathmandu at 10:15 pm last night.

Its magnitude was 5.6 on the Richter Scale, according to Dilli Ram Tiwari, survey officer at National Seismological Centre (NSC) in Kathmandu.

The second quake was measured at 10:27 pm yesterday, and it was 4.4 in magnitude.

The NSC has recorded two earthquakes this morning also.

The quakes at 6:02 am and 9.40 am were 4.4 and 5.2 on the Richter Scale, Tiwari said.

It is yet to learn whether the quakes caused any damage in the areas near epicentre.

Courtesy: National Seismological Centre, Lainchaur

Antarctic Ice Sheet Quakes Shed Light On Ice Movement and Earthquakes

ScienceDaily

Analysis of small, repeating earthquakes in an Antarctic ice sheet may not only lead to an understanding of glacial movement, but may also shed light on stick slip earthquakes like those on the San Andreas fault or in Haiti, according to Penn State geoscientists.


Analysis of small, repeating earthquakes in an Antarctic ice sheet may not only lead to an understanding of glacial movement, but may also shed light on stick slip earthquakes like those on the San Andreas fault or in Haiti, according to Penn State geoscientists. (Credit: © Achim Baqué / Fotolia)

“No one has ever seen anything with such regularity,” said Lucas K. Zoet, recent Penn State Ph. D. recipient, now a postdoctoral fellow at Iowa State University. “An earthquake every 25 minutes for a year.”

The researchers looked at seismic activity recorded during the Transantarctic Mountains Seismic Experiment from 2002 to 2003 on the David Glacier in Antarctica, coupled with data from the Global Seismic Network station Vanda. They found that the local earthquakes on the David Glacier, about 20,000 identified, were predominantly the same and occurred every 25 minutes give or take five minutes.

The researchers note in the current Nature Geoscience that, “The remarkable similarity of the waveforms … indicates that they share the same source location and source mechanisms.” They suggest that “the same subglacial asperity repeatedly ruptures in response to steady loading from the overlying ice, which is modulated by stress from the tide at the glacier front.”

“Our leading idea is that part of the bedrock is poking through the ductile till layer beneath the glacier,” said Zoet.

The researchers have determined that the asperity — or hill — is about a half mile in diameter.

The glacier, passing over the hill, creates a stick slip situation much like that on the San Andreas fault. The ice sticks on the hill and stress gradually builds until the energy behind the obstruction is high enough to move the ice forward. The ice moves in a step-by-step manner rather than smoothly.

But motion toward the sea is not the only thing acting on the ice streaming from David glacier. Like most glaciers near oceans, the edge of the ice floats out over the water and the floating ice is subject to the action of tides.

“When the tide comes in it pushes back on the ice, making the time between slips slightly longer,” said Sridhar Anandakrishnan, professor of geoscience. “When the tide goes out, the time between slips decreases.”

However, the researchers note that the tides are acting at the ground line, a long way from the location of the asperity and therefore the effects that shorten or lengthen the stick slip cycle are delayed.

“This was something we didn’t expect to see,” said Richard B. Alley, Evan Pugh Professor of Geosciences. “Seeing it is making us reevaluate the basics.”

He also noted that these glacial earthquakes, besides helping glaciologists understand the way ice moves, can provide a simple model for the stick slip earthquakes that occur between landmasses.

“We have not completely explained how ice sheets flow unless we can reproduce this effect,” said Alley. “We can use this as a probe and look into the physics so we better understand how glaciers move.”

Before 2002, this area of the David glacier flowed smoothly, but then for nearly a year the 20-minute earthquake intervals occurred and then stopped. Something occurred at the base of the ice to start and then stop these earthquakes.

“The best idea we have is that during those 300 days, a dirty patch of ice was in contact with the mount, changing the way stress was transferred,” said Zoet. “The glacier is experiencing earthquakes again, although at a different rate. It would be nice to study that.”

Unfortunately, the seismographic instruments that were on the glacier in 2002 no longer exist, and information is coming from only one source at the moment.

Tectonic Shoving Match Formed Caribbean Island Arc

OurAmazingPlanet Staff

The image shows how the Caribbean plate is pushed to the east relative to the South American plate, causing the Caribbean Islands' distinctive arc shape.
The image shows how the Caribbean plate is pushed to the east relative to the South American plate, causing the Caribbean Islands’ distinctive arc shape.
CREDIT: Courtesy of Meghan Miller and Thorsten Becker

The movement of Earth’s viscous mantle against South America has pushed the Caribbean islands east over the last 50 million years, according to a study published Monday (Aug. 20) in the journal Nature Geoscience.

The University of Southern California, in announcing the study, said the findings upend previous hypotheses of the seismic activity beneath the Caribbean Sea and provide an important new look at the unique tectonic interactions that are causing the Caribbean plate to tear away from South America.

The Caribbean plate is being pushed eastward due to a thick section of the South American plate called a “cratonic keel.” This section of crust is three times

Meanwhile, part of the South American plate is being pushed beneath the Caribbean plate, a process called subduction. Intense heat and pressure gradually force water-containing magma to rise into the Earth’s mantle and fuel the many active volcanoes in the region.

All of this pushing and pulling formed the distinctive arc shape of the Caribbean islands and has created a very complex system of faults between the two plates, in northern South America, according to the USC statement. The study mapped several of these strike-slip faults, which are similar to California’s San Andreas Fault.

Recent earthquakes in the area helped the two researchers develop an image of the Earth’s deep interior. The earthquake waves move slower or quicker depending on the temperature and composition of the rock.

“Studying the deep earth interior provides insights into how the Earth has evolved into its present form,” researcher Meghan S. Miller said in the statement.

For their study, the researchers used earthquake data to develop 176 computer models, USC said

**********************************************************************************************************

Volcanic Activity

Volcano activity of August 23-24, 2012 – Mt. Tongariro, Sotara, Shiveluch, Karymsky, Santiaguito, Fuego, Sakurajima, Batu Tara, Tungurahua, Kilauea and Nevado del Ruiz

By Richard Wilson and Armand Vervaeck

August , 2012 volcano activity

Mount Tongariro volcano (New Zealand) showed some seismicity earlier today (see seismogram below). The activity can only be seen in Oturere and West Tongariro seismograms (close to the Te Maari craters). Below also one of the rara clear view images of Mt. Tongariro with a strongly steaming vent. N report from GNS science about the seismicity however.  The Park service has announced that the trekking trails at Mount Tongariro would be reopened. A 3 km hazard and risk zone will remain in place for some time and might be further reduced once new information of the gas and ash composition is known.

Mt. Tongariro activity zone on one of these few clear moments since August 6 - Image courtesy Geonet and GNS Science

According to INGEOMINAS, the Observatorio Vulcanológico and Sismológico de Popayán reported that during 8-14 August seismic activity at Sotará increased. The seismic network recorded 110 magnitude 0.2-1.6 events mainly located in an area 0.1-5 km NE of the peak, at depths of 2-6 km. Inflation was detected in the NE area, coincident with the zone of increased seismicity. Web-camera views showed no morphological changes. The Alert Level was raised to III (Yellow; “changes in the behavior of volcanic activity”), or the second lowest level. (Smithsonian Institute)

KVERT reported moderate seismic activity from Karymsky during 10-20 August. Satellite imagery showed a weak thermal anomaly on the volcano during 10-13, 15, and 18-20 August. The Aviation Color Code remained at Orange.

KVERT reported that during 10-18 August weak seismic activity was detected at Shiveluch. Observers noted gas-and-steam activity during 15-17 August; weather conditions prevented observations of the volcano on the other days. Satellite imagery showed a thermal anomaly on the lava dome during 10, 12-13, and 18-19 August. Seismic activity increased to moderate levels and hot avalanches were observed during 19-20 August. The Aviation Color Code remained at Orange.

Insivumeh reports 2 moderate explosions at Santiaguito (Santa Maria), Guatemala. The other Guatemala volcano, Fuego sends a white plume approx. 50 meter in the air and grumbles every 1 to 3 minutes. See also seismograms from both volcanoes.

Activity observed by satellites
VAAC reports still the same volcanoes which can be dangerous for aviation ; Sakurajima, Batu Tara and a very active Tungurahua

SO2 satellite imagery shows SO2 clouds at the following volcanoes : Etna, Kilauea and Nevado del Ruiz. Clouds of a number of other volcanoes are not defined enough to be sure.

A smoking Nevado del Ruiz yesterday – image courtesy Ingeominas Colombia

Read more…

Earthquakes & Volcanic Activity

Earthquakes

 

 

RSOE EDIS

 

 

Date/Time (UTC) Magnitude Area Country State/Prov./Gov. Location Risk Source Details
26.08.2012 08:10:33 2.5 North America United States California Yountville There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
26.08.2012 07:40:21 3.2 Asia Turkey Manisa Golmarmara There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:43:26 2.0 North America United States California Brawley There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
26.08.2012 06:43:50 2.0 North America United States Alaska Nanwalek There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 06:44:07 2.0 North America United States California Brawley There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
26.08.2012 06:31:48 2.7 North America United States Hawaii Pahala There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 07:40:42 3.2 Asia Turkey Manisa Golmarmara There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:40:27 3.1 Asia Turkey Manisa Golmarmara There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:40:54 3.0 South-America Chile Valparaíso Los Andes There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 07:41:24 2.7 Asia Turkey Kütahya Saphane There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:41:13 2.2 Europe Norway Nordland Hemnesberget VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 07:41:42 2.2 Asia Turkey Malatya Arguvan VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 05:40:27 4.6 Atlantic Ocean – North Greenland Kujalleq Prins Christians Sund VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
26.08.2012 05:42:57 4.8 Atlantic Ocean Greenland Kujalleq Prins Christians Sund VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 05:40:52 4.6 Atlantic Ocean – North Greenland Kujalleq Prins Christians Sund VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
26.08.2012 05:36:02 4.6 Atlantic Ocean Greenland Kujalleq Prins Christians Sund VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 05:41:14 2.1 Europe Italy Emilia-Romagna San Prospero VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 04:00:34 2.4 North America United States Alaska Nanwalek There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 07:42:08 3.0 Asia Turkey Mu?la Ula VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 07:42:26 2.8 Asia Turkey Tokat Yesilyurt VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 03:30:28 2.3 North America United States California Markleeville VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 03:35:25 2.5 Europe Greece Central Greece Kastrakion VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 03:35:43 2.9 Europe Greece South Aegean Oia There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 02:45:30 2.1 North America United States Washington Danville VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
26.08.2012 02:35:39 2.0 Europe Spain Andalusia Villarrubia VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 01:50:31 2.0 North America United States Hawaii Pahala There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 02:36:01 3.2 Asia Turkey Kütahya Simav There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 01:25:34 2.1 North America United States Alaska Four Mile Road VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 06:41:31 2.2 Asia Turkey Malatya Doganyol VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 00:15:28 2.7 Middle America Mexico Baja California Alberto Oviedo Mota There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
26.08.2012 02:55:27 2.1 North America United States California Bertsch-Oceanview VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 00:40:26 3.0 Caribbean British Virgin Islands Road Town VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
26.08.2012 00:20:22 2.4 Europe Italy Sicily Letoianni There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:41:50 2.6 Asia Turkey ?zmir Seferihisar VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 23:20:20 2.3 South-America Chile Antofagasta Tocopilla VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 23:05:40 3.1 Caribbean Puerto Rico Rincon Stella VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
25.08.2012 23:20:49 3.5 South-America Argentina San Juan Calingasta VulkĂĄn 0 VulkĂĄn 0 VulkĂĄn 0 EMSC Details
26.08.2012 06:42:08 2.2 Asia Turkey Van Toyga There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 22:20:25 2.7 Europe Croatia Splitsko-Dalmatinska Strazica VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:42:27 2.2 Asia Turkey Van Yuvacik There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 21:50:42 3.3 North America United States Alaska Port Alsworth There are volcano(s) nearby the epicenter. VulkĂĄn 0 VulkĂĄn 0 USGS-RSOE Details
26.08.2012 06:42:46 2.6 Asia Turkey ?zmir Candarli VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 21:00:36 5.1 Asia Japan Fukushima Iwaki VulkĂĄn 0 There are airport(s) nearby the epicenter. There are nuclear facilities nearby the epicenter. USGS-RSOE Details
25.08.2012 21:15:21 5.1 Asia Japan Fukushima Iwaki There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. There are nuclear facilities nearby the epicenter. EMSC Details
25.08.2012 21:15:44 2.5 Europe Greece Peloponnese Velon There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 06:43:05 2.6 Asia Turkey Kütahya Saphane VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
26.08.2012 05:41:34 2.3 Asia Turkey Kütahya Simav There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 19:45:37 4.2 Middle America Mexico Sonora Puerto Penasco VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 USGS-RSOE Details
25.08.2012 20:15:26 4.2 Middle-America Mexico Sonora Puerto Penasco VulkĂĄn 0 There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details
25.08.2012 20:15:46 2.9 Europe Spain Canary Islands La Restinga There are volcano(s) nearby the epicenter. There are airport(s) nearby the epicenter. VulkĂĄn 0 EMSC Details

 

 

 

……………………………….

Mild Quake Hits Southwestern Iran

TEHRAN (FNA)- An earthquake measuring 3.3 on the Richter scale hit the town of Lali in Khuzestan province, Southwestern Iran, on Friday.

The Seismological center of Khuzestan province affiliated to the Geophysics Institute of Tehran University registered the quake at 08:02 hours local time (0332 GMT).

The epicenter of the quake was located in an area 49.2 degrees in longitude and 33.6 degrees in latitude.

Iran sits astride several major faults in the earth’s crust, and is prone to frequent earthquakes, many of which have been devastating.

The worst in recent times hit Bam in southeastern Kerman province in December 2003, killing 31,000 people – about a quarter of its population – and destroying the city’s ancient mud-built citadel.

The deadliest quake in the country was in June 1990 and measured 7.7 on the Richter scale. About 37,000 people were killed and more than 100,000 injured in the northwestern provinces of Gilan and Zanjan. It devastated 27 towns and about 1,870 villages.

Tehran alone sits on two major fault lines, and the capital’s 14 million residents fear a major quake.

 

 

Tremors jolt Rolpa villages

HIMALAYAN NEWS SERVICE

ROLPA: Villages in Rolpa got up this morning to an earthquake to the 10 consecutive time, locals said.

According to local Jay Prakash Rokamagar, they felt the shake for at least 10 times till 9.45 today morning. “Villagers have been staying out in the open since the first tremor,” he said.

With the quake’s epicenter in the border areas of Rukum and Baglung, the tremor of the first quake was felt in Kathmandu at 10.15 pm yesterday for 23 seconds. Its magnitude was 5 on the Richter Scale.

The tremor, measured at 28.699 degree North, 82.693 degree East and 38.3 kilometre depth, was mostly felt around Rukum and Rolpa’s eastern region and Rolpa’s northern areas, District Police Office Inspector, Rolpa, Rupesh Khadka said.

Newly build Thawang-4-based Bir Balbhadra Higher Secondary School and two-storey hostel building of Thawang Higher Secondary School have been collapsed by the quake. After the incident, all the students were shifted to safer places.

Likewise, Thawang VDC’s health post’s wall and Area Police Office building were also cracked by the tremors, DSP Kedar Rajaure informed.

More than a dozen houses, including Thawang-8’s Dil Bahadur Pariyar’s house and shed, Ramu Pariyar’s and Utte Pariyar’s houses and Kureli-8’s Reg Bahadur Budha’s two storey house were damaged by the shake.

Almost all the people of headquarters Libang and Rolpa are said to be staying in open after the tremor of the first quake.

The details of the further destruction are yet to arrive, District Police Office said.

**********************************************************************************************************

Volcanic Activity

Tangkubanperahu volcano (West Java): increased earthquakes prompt rise of alert level

BY: T

An increase in seismic activity at Tangkubanperahu volcano near Bandung, the capital of West Java, has been detected since 13 August and promted the Indonesian Volcanological survey (PVMBG) to increase the alert level of the volcano from 1 (normal) to 2 (alert) on 23 August.

Between 1 July and 23 Aug, 264 volcanic earthquakes were recorded, which is almost double to values measured during similar periods of time at the beginning of the year. In addition, pulses of volcanic tremor could be recognized.
Tangkubanperahu has 2 main craters, each about 1000 m wide and 400 m deep, filled by crater lakes, Kawah Ratu (queen) and Kawah Upas, respectively. The craters and lakes along with fumaroles and warm springs are popular tourist destinations. (It is recommended not to climb the volcano’s crater, which is a popular tourist destination in the area.
The last eruptions of the Tangkubanperahu were phreatic explosions in 1994.


Links / Sources:
Read more…

Blog Topics by Tags

Monthly Archives