Yellowstone Earthquake Cluster, Dec 2008
This first post is a copy of an email from my friend Priscilla in Jackson Hole Wyoming regarding the Yellowstone Earthquake Cluster occurring in the latter part of December 2008; and my first email reply back. I've transferred this email discussion to the forum due to interest by a variety of parties. Please post here rather than emailing me directly. Thnx, Nick
EMAIL (This email was a forward to people in Jackson, in turn forwarded to me):
Scientists eye unusual swarm of Yellowstone quakes
By MEAD GRUVER – 3 hours ago
CHEYENNE, Wyo. (AP) — Yellowstone National Park was jostled by a host of small earthquakes for a third straight day Monday, and scientists watched closely to see whether the more than 250 tremors were a sign of something bigger to come. Swarms of small earthquakes happen frequently in Yellowstone, but it's very unusual for so many earthquakes to happen over several days, said Robert Smith, a professor of geophysics at the University of Utah.
"They're certainly not normal," Smith said. "We haven't had earthquakes in this energy or extent in many years."
Smith directs the Yellowstone Seismic Network, which operates seismic stations around the park. He said the quakes have ranged in strength from barely detectable to one of magnitude 3.8 that happened Saturday. A magnitude 4 quake is capable of producing moderate damage.
"This is an active volcanic and tectonic area, and these are the kinds of things we have to pay attention to," Smith said. "We might be seeing something precursory.
"Could it develop into a bigger fault or something related to hydrothermal activity? We don't know. That's what we're there to do, to monitor it for public safety."
The strongest of dozens of tremors Monday was a magnitude 3.3 quake shortly after noon. All the quakes were centered beneath the northwest end of Yellowstone Lake.
A park ranger based at the north end of the lake reported feeling nine quakes over a 24-hour period over the weekend, according to park spokeswoman Stacy Vallie. No damage was reported.
"There doesn't seem to be anything to be alarmed about," Vallie said.
Smith said it's difficult to say what might be causing the tremors. He pointed out that Yellowstone is the caldera of a volcano that last erupted 70,000 years ago.
He said Yellowstone remains very geologically active — and its famous geysers and hot springs are a reminder that a pool of magma still exists five to 10 miles underground.
"That's just the surface manifestation of the enormous amount of heat that's being released through the system," he said.
Yellowstone has had significant earthquakes as well as minor ones in recent decades. In 1959, a magnitude 7.5 quake near Hebgen Lake just west of the park triggered a landslide that killed 28 people.
My first Email reply:
Since I started my "Astronomical Earthgrid Spacetime Mapping" technique many years ago, I found that seismic clusters occur when there are long-standing planetary configurations occurring that are angular (horizon plane / meridian) for a given location. As Earth rotates, a specific location can remain in a standing wave composed of the astrophysical geometric configuration for many days, even weeks. It is also possible to see the crescendo of the standing wave; i.e., the potential for a large quake/s, and generally when they occur. I have a nice example of this (in un-published book) where three primary quakes sequentially walked along the fault line of Central America in July 94. Considering this is likely to be volcanism driven, there may additional factors involved.
I have not yet explored the recent Yellowstone quakes and mapping by long-hand is a rather time consuming process. However, having the geographical area already defined helps a lot. I will see if I can explore this a bit, and get back to you on my / any findings.
A few resources if you do not already have them.
USGS: Latest Earthquakes Magnitude 2.5 or Greater in the UShttp://earthquake.usgs.gov/eqcenter/rec ... s_all.html
Recent Earthquakes in the Intermountain West (Yellowstone region)http://www.seis.utah.edu/req2webdir/rec ... stone.html
Yellowstone Seismic and GPS Monitoring (in the News)http://www.yellowstonepark.com/MoreToKn ... ?newsid=45