USGS New Insights into Earthquakes Around Nation
SHUT DOWN CGS NOW! OR and WA are among the top States that will be affected.
*The hazard is especially high along the west coast, intermountain west, and in several active regions of the central and eastern U.S., such as near New Madrid, MO, and near Charleston, SC. The 16 states at highest risk are Alaska, Arkansas, California, Hawaii, Idaho, Illinois, Kentucky, Missouri, Montana, Nevada, Oregon, South Carolina, Tennessee, Utah, Washington, and Wyoming.
*In Washington, scientists incorporated new knowledge of the Tacoma Fault into the maps and identified changes to the geometry of the Whidbey Island fault in the northern Puget Sound. Earthquake hazard also increased for Las Vegas because of new science. In Utah, scientists dug trenches to study prehistoric earthquakes along the Wasatch Fault. While the overall seismic hazard didn’t change significantly, detailed changes were made to the fault models in this region and robust data were acquired to hone the assessments. This is valuable since approximately 75% of Utah’s population, including the residents of Salt Lake City, lives near this fault.
The magnitude 7.9 earthquake in Wenchuan, China in 2008 provided many new records of shaking that are very similar to anticipated future earthquakes in the western U.S., as the fault structures are similar. Previously, scientists did not have nearly as many shaking records from earthquakes of this size.