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(go dare to read dat)
3.2 2008/12/28 09:23:57 44.505 -110.363 West Yellowstone, MT
2.2 2008/12/28 07:15:19 44.487 -110.358 West Yellowstone, MT
2.1 2008/12/28 06:37:20 44.491 -110.383 West Yellowstone, MT
2.4 2008/12/28 05:23:54 44.490 -110.360 West Yellowstone, MT
3.8 2008/12/28 05:15:56 44.492 -110.365 West Yellowstone, MT
2.6 2008/12/28 00:08:50 44.493 -110.354 West Yellowstone, MT
3.2 2008/12/27 22:30:03 44.495 -110.367 West Yellowstone, MT
3.4 2008/12/27 20:26:27 44.488 -110.365 West Yellowstone, MT
3.5 2008/12/27 20:17:32 44.481 -110.362 West Yellowstone, MT
2.3 2008/12/27 18:56:35 44.484 -110.367 West Yellowstone, MT
2.8 2008/12/27 18:23:07 44.490 -110.369 West Yellowstone, MT
2.5 2008/12/27 17:01:07 44.484 -110.367 West Yellowstone, MT
2.6 2008/12/27 16:30:53 44.497 -110.368 West Yellowstone, MT
From 1,000 to 3,000 earthquakes typically occur each year within Yellowstone National Park and its immediate surroundings. Although most are too small to be felt, these quakes reflect the active nature of the Yellowstone region, one of the most seismically active areas in the United States. Each year, several quakes of magnitude 3 to 4 are felt by people in the park.
Although some quakes are caused by rising magma and hot-ground-water movement, many emanate from regional faults related to crustal stretching and mountain building. For example, major faults along the Teton, Madison, and Gallatin Ranges pass through the park and likely existed long before the beginning of volcanism there. Movements along many of these faults are capable of producing significant earthquakes. The most notable earthquake in Yellowstone’s recent history occurred in 1959. Centered near Hebgen Lake, just west of the park, it had a magnitude of 7.5. This quake caused $11 million in damage (equivalent to $70 million in 2005 dollars) and killed 28 people, most of them in a landslide that was triggered by the quake.
Geologists conclude that large earthquakes like the Hebgen Lake event are unlikely within the Yellowstone Caldera itself, because subsurface temperatures there are high, weakening the bedrock and making it less able to rupture. However, quakes within the caldera can be as large as magnitude 6.5. A quake of about this size that occurred in 1975 near Norris Geyser Basin was felt throughout the region.
Even distant earthquakes can affect Yellowstone. In November 2002, the magnitude 7.9 Denali Fault earthquake struck central Alaska, 1,250 miles (2,000 km) northwest of Yellowstone. Because this quake’s energy was focused toward the active Yellowstone volcanic and hydrothermal system, it triggered hundreds of small earthquakes there. The region’s hydrothermal system is highly sensitive to quakes and undergoes significant changes in their wake. Earthquakes may have the potential to cause Yellowstone’s hot-water system to destabilize and produce explosive hydrothermal eruptions.
The university says the quakes of magnitude 3.5 and lower have been occurring beneath Yellowstone Lake, five to nine miles south-southeast of Fishing Bridge, a park landmark. The earthquakes that began on Friday and continued on Saturday intensified during the weekend, and there were reports that people in the Yellowstone Lake area felt the quakes.
The University of Utah says they've been in an area of the park where swarms are common.
Originally posted by sad_eyed_lady
Great job! I checked google to see if any news services have picked this up yet and they haven't. Five of the 13 are over 3.0. This is very noteworthy. Thanks for bringing it to ATS.