![]() ![]() The entire map shows that in the next 50 years there is a 10% probability that the peak acceleration shown by the contour lines will be exceeded at any given point on the map. What it does show is the peak acceleration of a theoretical particle on the ground during an earthquake. It does not show the chances of an earthquake occurring. You can view a peak acceleration map (PDF) for Teton County generated by the USGS National Seismic Hazard Mapping Project of 2002. The Teton fault is a normal fault, which means that the mountains rise and the valley drops during episodes of movement. ![]() The main fault, the Teton Fault along the base of the Tetons, can produce a significant earthquake in the range of 7.0 to 7.5 according to Dr. ![]() In fact, there are many faults in Teton County. There have not been any quakes of this magnitude along the Teton fault in recorded history, but it is still considered an active fault. Each of these earthquakes are estimated to have caused 3 to 6 feet of vertical ground movement (Windows Into the Earth Smith and Siegel, 2000). The magnificent Teton range, although peaceful now, was formed through thousands of major earthquakes in the 7 to 7.5 magnitude range over 13 million years. This is a fairly innocuous description of what can be a traumatic event, to which anyone who has experienced an earthquake can surely testify. FEMA defines an earthquake as a sudden slipping or movement of a portion of the earth’s crust, accompanied and followed by a series of vibrations. ![]()
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