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Originally posted by oghamxx
A 2.8 in Oklahoma about 2 hours ago. I have noticed NM, OK and a spot in north central Arkansas (next?) seem to have had quakes close together in time in the past. Makes me think the failed east-west rift from Texas thru Arkansas intersects with the Reelfoot rift underlying the NM fault zone and they affect one another.
Given all the advances in geology, including GPS and study of the magma plumes, I wonder if a magma plume is rising under the rifts and will make them active again. Volcanoes on the way???
Originally posted by yaquii
Some Californians and others think a 4.0 isnt a big deal. Well it is, depending where you live.. California is built on sand. Strike the sand with a hammer and it is pretty well absorbed. Strike bedrock, and well, your hands are gonna ring.
Originally posted by Virgil Cain
Based on what you've read in there, do you think it's possible that there may have been some foreshocks that went unnoticed because of lack of communication and/or the sparse population at the time?
A common assumption -one that we hold also- is that the currentseismicity is illuminating the most active faults, i.e. those that ruptured in 1811-1812 and also in pre-1811activity. The hypocenters are located with regional seismographic networks operated by three universities(Saint Louis, Memphis, and Kentucky). Within the NMSZ, which is defined by the epicenter alignmentswithin 35.5-37.0'N and 89.2-90.5'W, the-epicentral uncertainty is < 1 km, but depths are poorlyconstrained. Since network monitoring began in 1974 more than 3000 NMSZ earthquakes have beenlocated (Herrmann et al 1994), none of which reach moment magnitude M 5.0.