Sunday, July 24, 2016

Small quake felt in Arizona, New Mexico; aftershock to 2014 Duncan earthquake?

A magntiude 3.0 earthquake struck on the Arizona-New Mexico border just before 7 am this morning, and residents in both states report feeling it.  The preliminary epicenter calculated by the USGS is about 3-4 miles south of Duncan Highway - US70 between Lordsburg and Safford.  [right, orange star marks epicenter.  Credit, USGS]


AZGS has a temporary seismic station in the area following the Duncan M-5.3 earthquake of 2014, so we should be able to provide a more accurate location once those data are analyzed. We are still seeing numerous aftershocks from that event. 

Today's quake is roughly 10 miles south-southeast of Duncan and near the eastern edge of the aftershock zone from the 2014 main quake.  [Below, location of the 2014 Duncan main shock and aftershocks through September 2014.  Credit, Jeri Young, AZSG]  

I speculate that today's event is yet another in the ongoing aftershocks of that M=5.3 quake.




3 comments:

  1. Hello, cool blog, congrats! sorry for not understanding the area so much, but what is the source of all these quakes? results of the san andreas fault?

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  2. Lucas, the quakes appear to be occurring on relatively small faults that are part of the Basin & Range extension regime, and not related to the San Andreas system.

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