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Originally posted by MischeviousElf
have been digging around really wanted to read it again and bring to ATS the info.
Originally posted by TrueAmerican
Val, in a general sense, could you give us your take on this recent swarm activity at Yellowstone? Where does it all fit in? Do you feel these quakes are caused from hydrothermal or geothermal activity, or both? And why in your opinion is the USGS justified at this point in not raising the alert level? Or do you feel otherwise?
I don't remember seeing you giving an overall opinion on these quakes, but forgive if I missed it.
QUAKE IN ALASKA CHANGED YELLOWSTONE GEYSERS
Some Erupted More Often, Others Less Often After Big Jolt 2,000 Miles
May 27, 2004 - A powerful earthquake that rocked Alaska in 2002
not only triggered small earthquakes almost 2,000 miles away at
Wyoming's Yellowstone National Park - as was reported at the time - but
also changed the timing and behavior of some of Yellowstone's geysers
and hot springs, a new study says.
"We did not expect to see these prolonged changes in the hydrothermal system," says University of Utah seismologist Robert B.
Smith, a co-author of the study in the June issue of the journal
While other large quakes have been known to alter the activity
of nearby geysers and hot springs, the Denali fault earthquake of Nov.
3, 2002, is the first known to have changed the behavior of such
hydrothermal features at great distances, according to Smith and his
colleagues. They say the magnitude-7.9 quake was one of the strongest of
its type in North America in the past 150 years.
Smith conducted the study with Stephan Husen, a University of
Utah adjunct assistant professor of geophysics who works at the Swiss
Federal Institute of Technology; Ralph Taylor, an engineer who designs
geyser monitoring equipment at Yellowstone National Park; and Henry
Heasler, Yellowstone National Park's geologist.
Less than 18 hours after the Denali earthquake in Alaska, Smith
and colleagues at the University of Utah Seismograph Stations reported
the major jolt had triggered more than 200 small earthquakes in
Yellowstone - something widely reported by news media in the days
following the quake.
Smith now says the triggered quakes at Yellowstone numbered more
than 1,000 within a week of the Denali quake - if the count includes
tiny temblors that were not "located," meaning their epicenters and
depths were not determined. He says the quakes ranged in magnitude from
minus 0.5 to just under 3.0. (Tiny quakes have negative magnitudes
because modern seismic equipment can detect quakes smaller than was
possible when the logarithmic magnitude scales were devised.)
Most of the triggered quakes were centered near geysers and hot
Strong Earthquakes as Seismic and Geothermal Triggers
Scientists once believed that an earthquake at one location
could not trigger earthquakes at distant sites. That belief was
shattered in 1992 when the magnitude-7.3 Landers earthquake in
California's Mojave Desert triggered a swarm of quakes more than 800
miles away at Yellowstone, as well as other temblors near Mammoth Lakes,
Calif., and Yucca Mountain, Nev.
Originally posted by Valhall
The Baker activity is interesting in light of the recent Yellowstone activity.