reply to post by speculativeoptimist
Hi speculativeoptimist. Thanks for linking that article. It's really a darn shame that they have to scrounge for funding when lives are at stake.
Especially disconcerting was the mention of hydroelectric dams. If one fails, that will be catastrophic for everyone down stream.
ETA: Your avatar is a hoot! Cute pup.
reply to post by fastfred
Thanks for posting your firsthand knowledge of the volcano fastfred.
I had read that there are fumeroles on the mountain, but I didn't realize
that the sulfur smell was so strong. Really interesting--I'm definitely going to do some more reading.
In Mt. Hood Earthquake Activity: Tectonic or Volcanic Origins? found here
, the authors state
that the very last known volcanic activity was between 1859-1865, when early settlers reporting seeing a glow from the summit.
reply to post by mark1167
Sweet .gif mark1167. Did you make that, or is it hidden on USGS and I just never noticed?
After reading the article linked above, the PNSN scientists are fairly certain these quakes are from normal mechanism faulting--the farthest north
such Basin and Range type extensional faulting. But
, (there always seems to be a "but") they hold out saying so with absolute certainty for a
The 2002 swarm had a mainshock, followed by smaller aftershocks, indicating just your run-of the-mill fault rupture. Earlier swarms from the 1980's
and 1990's (as well as this latest swarm) do not follow this pattern.
And, proximity to a historically active volcano.
Also interesting, during the number crunching of the 2002 swarm, they discovered a weak
low-velocity zone at 4 km depth. (low-velocity zones
can indicate an area of warm, possible molten rock)
I'm hoping they will analyze this latest swarm to see if the weak, slow zone is still there.
edit on 2/24/2012 by Olivine because: edit
edit on 2/24/2012 by Olivine because: (no reason given)