PSN-L Email List Message
Subject: Alaska's swarm
From: tchannel1@............
Date: Thu, 7 Aug 2008 17:40:54 -0600
Hi All, I have a friend, who has a friend in Alaska, he =
writes......below........He sent me a screenshot of his helicorder, I =
have no way to post it here but just email me directly and I will send =
it to you..It is massive...........I counted 248 events at hour 22:00 =
today.
Thanks, Ted
here's a helicorder image (PNG format) of the swarm from an 3C short =
period instrument=20
on Great Sitkin island, 30 miles from Kasatochi
M
it is crazy around here now. let me send you a screenshot of the =
earthquake swarm=20
here in a second.=20
in the last hour continuous tremor has begun to accompany the =
earthquakes, so=20
this may become volcanic instead of just tectonic. the volcano =
(Kasatochi) is not well known and has=20
no seismic instruments. the closest seismometers are about 30 miles =
away.
however, the tremor is strong enough to be seen there.
the swarm to the best of my knowledge is not a typical =
mainshock-aftershock=20
sequence. so this means it may be a result of an intrusion.
M=20
Hi All, I have a friend, who =
has a=20
friend in Alaska, he writes......below........He sent me a screenshot of =
his=20
helicorder, I have no way to post it here but just email me directly and =
I will=20
send it to you..It is massive...........I counted 248 events at hour =
22:00=20
today.
Thanks, Ted
here's a helicorder image (PNG format) of the swarm from an 3C =
short period=20
instrument
on Great Sitkin island, 30 miles from =
Kasatochi
M
it is crazy around here now. let me send you a screenshot of the=20
earthquake swarm
here in a second.
in the last hour continuous tremor has begun to accompany the=20
earthquakes, so
this may become volcanic instead of just tectonic. the volcano=20
(Kasatochi) is not well known and has
no seismic instruments. the closest seismometers are about 30 =
miles=20
away.
however, the tremor is strong enough to be seen there.
the swarm to the best of my knowledge is not a typical=20
mainshock-aftershock
sequence. so this means it may be a result of an intrusion.
M
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