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09-26-2014, 09:01 PM
[quote='Skywise' pid='435' dateline='1411723927']
Very vigorous swarm going on. As I write this (2:30AM Pacific) there are over 500 quakes in last 24 hours. M3.8 is the largest so far. Depths are mostly 4-7km. It's definitely in the caldera and appears to be in the resurgent dome as well.
I did a quick search on the area for all of 1980. There were nearly 800 events over the entire year but it should be noted that the smallest are about M3 since the instrumentation wasn't as dense or sensitive back then. This swarm has events measured down to the M0 range.
If I limit the current event to M2.5 and above, there are only 34 in the past 24 hours, which roughly puts in comparable to the 1980 sequence.
There was a M6.1 on May 25th, 1980 preceded by months of lower level activity. I think there's a good chance we could see some 4's and maybe at least a 5 in the current sequen
END QUOTE
I note that the sequence is about 10-11 km depth, with one about 6 km. So far no shallowing, but who knows? Bears watching.
Very vigorous swarm going on. As I write this (2:30AM Pacific) there are over 500 quakes in last 24 hours. M3.8 is the largest so far. Depths are mostly 4-7km. It's definitely in the caldera and appears to be in the resurgent dome as well.
I did a quick search on the area for all of 1980. There were nearly 800 events over the entire year but it should be noted that the smallest are about M3 since the instrumentation wasn't as dense or sensitive back then. This swarm has events measured down to the M0 range.
If I limit the current event to M2.5 and above, there are only 34 in the past 24 hours, which roughly puts in comparable to the 1980 sequence.
There was a M6.1 on May 25th, 1980 preceded by months of lower level activity. I think there's a good chance we could see some 4's and maybe at least a 5 in the current sequen
END QUOTE
I note that the sequence is about 10-11 km depth, with one about 6 km. So far no shallowing, but who knows? Bears watching.