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+--- Thread: M7.2 SW Mexico subduction quake today (/showthread.php?tid=89)
M7.2 SW Mexico subduction quake today - Island Chris - 04-18-2014
M7.2 thrust (subduction) quake SW Mexican coast. This is the same subducting plate, the Cocos plate, that caused a M6.6 quake far to the SE, a week ago beneath Nicaragua.
A couple of Great quakes have had large foreshocks lately: a M7.4 a few days before the 2011 M9.0 Tohoku (Japan) quake, and a M6.7 on March 16 2014 before the M8.2 North Chile quake.
Of course, Great quakes having foreshocks at a high percentage lately (but small sample) is not the same as the chance of a given M6 or M7 being followed by a larger one. I think USGS has said that chance is 5 to 10%.
http://earthquake.usgs.gov/earthquakes/eventpage/usb000pq41#summary
Chris