Monday, April 25, 2016

Quake swarm continues in northwest Arizona

The earthquake swarm continues in northwest Arizona near the Nevada border. There were more than a dozen events during the past week, with the largest being a magnitude 2.7 yesterday (Sunday) just after noon.  A magnitude 1.9 event just one minute later.   [Right, epicenters of last weeks quakes shown by yellow dots. The orange dots are from Sunday's quakes. Credit, USGS]

The swarm began on March 28 and more than 50 earthquakes have been recorded so far.   Swarms in other areas have lasted for months in some cases.

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