Near ancient Long Valley Supervolcano – Seismologists are keeping a close eye on an area southwest of Hawthorne, Nevada where hundreds of earthquakes – the largest a 4.4-magnitude – have struck since Sunday.
“It’s a little bit concerning in a sense,” says Graham Kent is Director of Nevada Seismological Laboratory at the University of Nevada Reno. The largest earthquakes in these sequences are pretty large in size. “These are the biggest in a sequence we’ve seen at least in the last couple of years.”
Size is not the only reason Kent says they are watching the swarm of quakes closely. These quakes occurred on top of a fault that has until now remained unknown or has not been active.
But just because those devastating quakes happened on un-named faults, says Kent, does not mean that the series of quakes near Hawthorne will lead to a big quake there.
Most of the quakes have been small, most have occurred within a few minutes of each other, and their number has increased almost daily since April 7.
Right now, there is no way to predict where the next big quake will occur.
See entire article:
Thanks to Stephanie Relfe, Benjamin Napier, Russell Steele, Kim Courter and John McCann for this link
Stephanie points out that Hawthorne lies atop the ancient Long Valley Supervolcano.
Two magnitude-4 earthquakes today, 15 Apr 2011