06/09/10 14:56: 7.83 GMT
GULF OF MEXICO
Epicenter: 26.339 -86.568
MW 6.0 Depth 10km (6.2 miles)
Sweet! An intraplate earthquake right south of Alabama. *swoon*
This earthquake was centered beneath the Gulf of Mexico, well distant from the nearest active plate boundary. Such “midplate” earthquakes are much less common than earthquakes occurring on faults near plate boundaries … This is the largest of more than a dozen shocks that have been instrumentally recorded from the eastern Gulf of Mexico in the past three decades, and it is the most widely felt. The most recent significant earthquake in the region occurred on February 10th, 2006 and had a magnitude of 5.2. We have not associated this earthquake with a specific causative fault.
In other words, this moderately deep earthquake did not occur along a fault, although the moment tensor solution suggests movement along an almost N-S-oriented
normal reverse fault with a shallow southwest dip. Eeeeenteresting.
At 9:56 this morning, I was cleaning my floors with the old Eureka Wind Tunnel, a seismic source unto itself, so I may or may not have felt the quake. Also realize that a seismograph located here would go nuts every 15 minutes, i.e. when the RTA bus goes by. Do you know how irritated this geologist is at not having experienced an earthquake in her own backyard? If, however you felt it, let the USGS know.