Earth Watch Report - Earthquakes
Photo of EQ’s for the last 7 days
Alaska – 16 EQs May 15-16-17 2013 Photo of EQs last 30 days
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M3.1 – 60km SSE of Cantwell, Alaska
2013-05-15 06:45:32 UTC
Event Time
- 2013-05-15 06:45:32 UTC
- 2013-05-14 22:45:32 UTC-08:00 at epicenter
- 2013-05-15 01:45:32 UTC-05:00 system time
Location
62.858°N 148.700°W depth=61.2km (38.0mi)
Nearby Cities
- 60km (37mi) SSE of Cantwell, Alaska
- 157km (98mi) NNE of Knik-Fairview, Alaska
- 193km (120mi) NNE of Anchorage, Alaska
- 223km (139mi) SSW of Badger, Alaska
- 756km (470mi) WNW of Whitehorse, Canada
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M2.8 – 86km E of Old Iliamna, Alaska
2013-05-15 07:19:17 UTC
Event Time
- 2013-05-15 07:19:17 UTC
- 2013-05-14 23:19:17 UTC-08:00 at epicenter
- 2013-05-15 02:19:17 UTC-05:00 system time
Location
59.779°N 153.386°W depth=130.8km (81.3mi)
Nearby Cities
- 86km (53mi) E of Old Iliamna, Alaska
- 249km (155mi) SW of Anchorage, Alaska
- 283km (176mi) SW of Knik-Fairview, Alaska
- 635km (395mi) SSW of Fairbanks, Alaska
- 1017km (632mi) W of Whitehorse, Canada
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M2.5 – 33km SE of King Salmon, Alaska
2013-05-15 10:09:49 UTC
Event Time
- 2013-05-15 10:09:49 UTC
- 2013-05-15 02:09:49 UTC-08:00 at epicenter
- 2013-05-15 05:09:49 UTC-05:00 system time
Location
58.456°N 156.301°W depth=197.0km (122.4mi)
Nearby Cities
- 33km (21mi) SE of King Salmon, Alaska
- 472km (293mi) SW of Anchorage, Alaska
- 505km (314mi) SW of Knik-Fairview, Alaska
- 841km (523mi) SW of College, Alaska
- 1220km (758mi) W of Whitehorse, Canada
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M2.5 – 63km ENE of Sand Point, Alaska
2013-05-15 12:04:01 UTC
Event Time
- 2013-05-15 12:04:01 UTC
- 2013-05-15 04:04:01 UTC-08:00 at epicenter
- 2013-05-15 07:04:01 UTC-05:00 system time
Location
55.505°N 159.549°W depth=65.6km (40.8mi)
Nearby Cities
- 63km (39mi) ENE of Sand Point, Alaska
- 849km (528mi) SW of Anchorage, Alaska
- 883km (549mi) SW of Knik-Fairview, Alaska
- 1224km (761mi) SW of College, Alaska
- 1544km (959mi) W of Whitehorse, Canada
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M2.7 – 18km SE of Redoubt Volcano, Alaska
2013-05-15 12:41:48 UTC
Event Time
- 2013-05-15 12:41:48 UTC
- 2013-05-15 04:41:48 UTC-08:00 at epicenter
- 2013-05-15 07:41:48 UTC-05:00 system time
Location
60.387°N 152.464°W depth=96.7km (60.1mi)
Nearby Cities
- 18km (11mi) SE of Redoubt Volcano, Alaska
- 167km (104mi) WSW of Anchorage, Alaska
- 199km (124mi) SW of Knik-Fairview, Alaska
- 552km (343mi) SSW of Fairbanks, Alaska
- 953km (592mi) W of Whitehorse, Canada
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M2.7 – 63km SE of Adak, Alaska
2013-05-15 13:26:55 UTC
Event Time
- 2013-05-15 13:26:55 UTC
- 2013-05-15 01:26:55 UTC-12:00 at epicenter
- 2013-05-15 08:26:55 UTC-05:00 system time
Location
51.490°N 175.997°W depth=23.6km (14.7mi)
Nearby Cities
- 63km (39mi) SE of Adak, Alaska
- 1524km (947mi) SSE of Anadyr’, Russia
- 1730km (1075mi) E of Petropavlovsk-Kamchatskiy, Russia
- 1747km (1086mi) E of Yelizovo, Russia
- 2692km (1673mi) W of Whitehorse, Canada
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M2.7 – 95km N of Kodiak, Alaska
2013-05-15 15:16:55 UTC
Event Time
- 2013-05-15 15:16:55 UTC
- 2013-05-15 07:16:55 UTC-08:00 at epicenter
- 2013-05-15 10:16:55 UTC-05:00 system time
Location
58.648°N 152.537°W depth=4.7km (2.9mi)
Nearby Cities
- 95km (59mi) N of Kodiak, Alaska
- 321km (199mi) SSW of Anchorage, Alaska
- 358km (222mi) SSW of Knik-Fairview, Alaska
- 734km (456mi) SSW of Fairbanks, Alaska
- 1008km (626mi) W of Whitehorse, Canada
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M2.7 – 112km ESE of Akutan, Alaska
2013-05-15 20:28:28 UTC
Event Time
- 2013-05-15 20:28:28 UTC
- 2013-05-15 09:28:28 UTC-11:00 at epicenter
- 2013-05-15 15:28:28 UTC-05:00 system time
Location
53.833°N 164.138°W depth=41.1km (25.5mi)
Nearby Cities
- 112km (70mi) ESE of Akutan, Alaska
- 1180km (733mi) SW of Anchorage, Alaska
- 1213km (754mi) SW of Knik-Fairview, Alaska
- 1530km (951mi) SW of College, Alaska
- 1894km (1177mi) W of Whitehorse, Canada
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M3.4 – 209km SSE of Akutan, Alaska
2013-05-15 23:48:07 UTC
Event Time
- 2013-05-15 23:48:07 UTC
- 2013-05-15 12:48:07 UTC-11:00 at epicenter
- 2013-05-15 18:48:07 UTC-05:00 system time
Location
52.401°N 164.556°W depth=25.5km (15.8mi)
Nearby Cities
- 209km (130mi) SSE of Akutan, Alaska
- 1322km (821mi) SW of Anchorage, Alaska
- 1356km (843mi) SW of Knik-Fairview, Alaska
- 1683km (1046mi) SW of College, Alaska
- 2001km (1243mi) W of Juneau, Alaska
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M2.7 – 45km SSE of Adak, Alaska
2013-05-16 06:10:42 UTC
Event Time
- 2013-05-16 06:10:42 UTC
- 2013-05-15 18:10:42 UTC-12:00 at epicenter
- 2013-05-16 01:10:42 UTC-05:00 system time
Location
51.515°N 176.360°W depth=31.4km (19.5mi)
Nearby Cities
- 45km (28mi) SSE of Adak, Alaska
- 1516km (942mi) SSE of Anadyr’, Russia
- 1705km (1059mi) E of Petropavlovsk-Kamchatskiy, Russia
- 1722km (1070mi) E of Yelizovo, Russia
- 2710km (1684mi) W of Whitehorse, Canada
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M4.3 – 10km ESE of Nikolski, Alaska
2013-05-16 10:58:56 UTC
Event Time
- 2013-05-16 10:58:56 UTC
- 2013-05-16 01:58:56 UTC-09:00 at epicenter
- 2013-05-16 05:58:56 UTC-05:00 system time
Location
52.890°N 168.728°W depth=45.8km (28.5mi)
Nearby Cities
- 10km (6mi) ESE of Nikolski, Alaska
- 1462km (908mi) WSW of Anchorage, Alaska
- 1493km (928mi) WSW of Knik-Fairview, Alaska
- 1535km (954mi) SE of Anadyr’, Russia
- 2203km (1369mi) W of Whitehorse, Canada
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M2.5 – 17km WNW of Willow, Alaska
2013-05-16 21:48:30 UTC
Event Time
- 2013-05-16 21:48:30 UTC
- 2013-05-16 13:48:30 UTC-08:00 at epicenter
- 2013-05-16 16:48:30 UTC-05:00 system time
Location
61.780°N 150.364°W depth=8.5km (5.3mi)
Nearby Cities
- 17km (11mi) WNW of Willow, Alaska
- 50km (31mi) NW of Knik-Fairview, Alaska
- 67km (42mi) NNW of Anchorage, Alaska
- 365km (227mi) SSW of Fairbanks, Alaska
- 828km (514mi) WNW of Whitehorse, Canada
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M4.3 – 44km SW of Homer, Alaska
2013-05-17 05:24:55 UTC
Event Time
- 2013-05-17 05:24:55 UTC
- 2013-05-16 21:24:55 UTC-08:00 at epicenter
- 2013-05-17 00:24:55 UTC-05:00 system time
Location
59.309°N 151.993°W depth=54.4km (33.8mi)
Nearby Cities
- 44km (27mi) SW of Homer, Alaska
- 242km (150mi) SSW of Anchorage, Alaska
- 278km (173mi) SSW of Knik-Fairview, Alaska
- 654km (406mi) SSW of Badger, Alaska
- 954km (593mi) W of Whitehorse, Canada
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Instrumental Intensity
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M3.5 – 176km SE of Chirikof Island, Alaska
2013-05-17 15:43:24 UTC
Event Time
- 2013-05-17 15:43:24 UTC
- 2013-05-17 05:43:24 UTC-10:00 at epicenter
- 2013-05-17 10:43:24 UTC-05:00 system time
Location
54.668°N 153.735°W depth=9.8km (6.1mi)
Nearby Cities
- 176km (109mi) SE of Chirikof Island, Alaska
- 763km (474mi) SSW of Anchorage, Alaska
- 799km (496mi) SSW of Knik-Fairview, Alaska
- 1180km (733mi) SSW of Badger, Alaska
- 1251km (777mi) W of Juneau, Alaska
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M2.5 – 39km SSW of Redoubt Volcano, Alaska
2013-05-17 23:58:06 UTC
Event Time
- 2013-05-17 23:58:06 UTC
- 2013-05-17 15:58:06 UTC-08:00 at epicenter
- 2013-05-17 18:58:06 UTC-05:00 system time
Location
60.162°N 153.031°W depth=121.9km (75.7mi)
Nearby Cities
- 39km (24mi) SSW of Redoubt Volcano, Alaska
- 207km (129mi) WSW of Anchorage, Alaska
- 239km (149mi) SW of Knik-Fairview, Alaska
- 588km (365mi) SSW of Fairbanks, Alaska
- 988km (614mi) W of Whitehorse, Canada
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M2.6 – 186km NNE of Cape Yakataga, Alaska
2013-05-18 01:59:14 UTC
Event Time
- 2013-05-18 01:59:14 UTC
- 2013-05-17 18:59:14 UTC-07:00 at epicenter
- 2013-05-17 20:59:14 UTC-05:00 system time
Location
61.504°N 140.689°W depth=0.1km (0.1mi)
Nearby Cities
- 186km (116mi) NNE of Cape Yakataga, Alaska
- 316km (196mi) WNW of Whitehorse, Canada
- 474km (295mi) E of Knik-Fairview, Alaska
- 493km (306mi) E of Anchorage, Alaska
- 499km (310mi) NW of Juneau, Alaska
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Tectonic Summary
Seismotectonics of Alaska
The Aleutian arc extends approximately 3,000 km from the Gulf of Alaska in the east to the Kamchatka Peninsula in the west. It marks the region where the Pacific plate subducts into the mantle beneath the North America plate. This subduction is responsible for the generation of the Aleutian Islands and the deep offshore Aleutian Trench.
The curvature of the arc results in a westward transition of relative plate motion from trench-normal (i.e., compressional) in the east to trench-parallel (i.e., translational) in the west, accompanied by westward variations in seismic activity, volcanism, and overriding plate composition. The Aleutian arc is generally divided into three regions: the western, central, and eastern Aleutians. Relative to a fixed North America plate, the Pacific plate is moving northwest at a rate that increases from roughly 60 mm/yr at the arc’s eastern edge to 76 mm/yr near its western terminus. The eastern Aleutian arc extends from the Alaskan Peninsula in the east to the Fox Islands in the west. Motion along this section of the arc is characterized by arc-perpendicular convergence and Pacific plate subduction beneath thick continental lithosphere. This region exhibits intense volcanic activity and has a history of megathrust earthquakes.
The central Aleutian arc extends from the Andreanof Islands in the east to the Rat Islands in the west. Here, motion is characterized by westward-increasing oblique convergence and Pacific plate subduction beneath thin oceanic lithosphere. Along this portion of the arc, the Wadati-Benioff zone is well defined to depths of approximately 200 km. Despite the obliquity of convergence, active volcanism and megathrust earthquakes are also present along this margin.
The western Aleutians, stretching from the western end of the Rat Islands in the east to the Commander Islands, Russia, in the west, is tectonically different from the central and eastern portions of the arc. The increasing component of transform motion between the Pacific and North America plates is evidenced by diminishing active volcanism; the last active volcano is located on Buldir Island, in the far western portion of the Rat Island chain. Additionally, this portion of the subduction zone has not hosted large earthquakes or megathrust events in recorded history. Instead, the largest earthquakes in this region are generally shallow, predominantly strike-slip events with magnitudes between M5-6. Deeper earthquakes do occur, albeit rather scarcely and with small magnitudes (M<4), down to approximately 50 km.
Most of the seismicity along the Aleutian arc results from thrust faulting that occurs along the interface between the Pacific and North America plates, extending from near the base of the trench to depths of 40 to 60 km. Slip along this interface is responsible for generating devastating earthquakes. Deformation also occurs within the subducting slab in the form of intermediate-depth earthquakes that can reach depths of 250 km. Normal faulting events occur in the outer rise region of the Aleutian arc resulting from the bending of the oceanic Pacific plate as it enters the Aleutian trench. Additionally, deformation of the overriding North America plate generates shallow crustal earthquakes.
The Aleutian arc is a seismically active region, evidenced by the many moderate to large earthquakes occurring each year. Since 1900, this region has hosted twelve large earthquakes (M>7.5) including the May 7, 1986 M8.0 Andreanof Islands, the June 10, 1996 M7.9 Andreanof Islands, and the November 17, 2003 M7.8 Rat Islands earthquakes. Six of these great earthquakes (M8.3 or larger) have occurred along the Aleutian arc that together have ruptured almost the entire shallow megathrust contact. The first of these major earthquakes occurred on August 17, 1906 near the island of Amchitka (M8.3) in the western Aleutian arc. However, unlike the other megathrust earthquakes along the arc, this event is thought to have been an intraplate event occurring in the shallow slab beneath the subduction zone interface.
The first megathrust event along the arc during the 20th century was the November 10, 1938 M8.6 Shumagin Island earthquake. This event ruptured an approximately 300 km long stretch of the arc from the southern end of Kodiak Island to the northern end of the Shumagin Islands and generated a small tsunami that was recorded as far south as Hawaii.
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Alaska – 5 Earthquakes , 4.5 to 2.6 Magnitude May 14th, 2013 : Total of 126 EQ’s in the last 27 days
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Alaska – 5.7 Magnitude Earthquake, 46km W of Amukta Island. Total of 122 EQ’s in 27 days
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Alaska - 2 Earthquakes , 4.8 to 4.2 Magnitude May 10th, 2013 : Total of 121 EQ’s in the last 26 days
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Alaska - 16 Earthquakes Ranging from 4.5 to 2.5 Magnitude in the last 3 days May 7th – 9th, 2013 : Total of 119 EQ’s in the last 25 days
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Alaska - 8 Earthquakes Ranging From 3.6 to 2.6 Magnitude May 3rd, 4th and 5th 2013 : Total of 103 EQ’s in the last 22 days
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Alaska - 6 Earthquakes Ranging From 4.5 to 2.5 Magnitude May 2nd, 2013 : Total of 95 EQ’s in the last 19 days
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Alaska - 6 Earthquakes Ranging From 3.2 to 2.5 Magnitude : Total of 89 EQ’s in the last 18 days
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Alaska – 8 EQ’s ranging from 3.2 to2.6 magnitude April 30th, 2013 : Total of 83 Earthquakes in the last 17 days
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Alaska – Nineteen Earthquakes Ranging From 5.1 to 2.5 Magnitude April 22nd and 23rd , 2013. A Total of 75 EQ’s in the last 10 days
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Alaska – Three Earthquakes Ranging From 5.7 to 2.5 Magnitude April 21st , 2013. A Total of 56 EQ’s in the last 8 days
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Alaska : Earthquake swarm. 12 earthquakes within the range of 2.5 to 4.5 Magnitude registered April 13th and 14th, 2013
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