Quake - Southern Mid-Atlantic Ridge - originally USGS posted as 5.8, already downgraded

[Joan C.]

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2010yybt.php

[Joan C.]

Is this the information that you're referring to? NST=238, Nph=238, Dmin=894 km, Rmss=1.01 sec, Gp= 36°,
M-type=body wave magnitude (Mb), Version=7

[Stephen Gerard]

The big question is 5.8 what? There's more than one earthquake magnitude scale and each is used for different reasons.

[Joan C.]

RSOE had it posted as 5.8 magnitude as well. There's a 3.5 mag is posted for Portugal - on the Northern mid atlantic ridge.

[Stephen Gerard]

GEOFON is showing it as a 5.6 but doesn't say if that's Richter (ML), Mw, Mb, or Ms.

Red Puma shows this:
20Jul2010 17:19:50.5 29.1S 13.2W 20 MS=5.5 M*GSR SOUTHERN MID-ATLANTIC RIDG1922
20Jul2010 17:19:52.1 29.1S 13.2W 19 M =5.5 M*NEI SOUTHERN MID-ATLANTIC RIDG1804
20Jul2010 17:20:03.6 27.1S 14.0W 60 mb=5.4 M*ROM SOUTHERN MID-ATLANTIC RIDG1800