First Quarter Hanford Seismic Report for Fiscal Year 2009 Page: 4 of 41
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The Hanford Seismic Assessment Program (HSAP) provides an uninterrupted collection of high-
quality raw and processed seismic data from the Hanford Seismic Network for the U.S. Department of
Energy and its contractors. The HSAP is responsible for locating and identifying sources of seismic
activity and monitoring changes in the historical pattern of seismic activity at the Hanford Site. The data
are compiled, archived, and published for use by the Hanford Site for waste management, natural
phenomena hazards assessments, and engineering design and construction. In addition, the HSAP works
with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant
earthquake on the Hanford Site. The Hanford Seismic Network and the Eastern Washington Regional
Network consist of 44 individual sensor sites and 15 radio relay sites maintained by the Hanford Seismic
For the Hanford Seismic Network, ten local earthquakes were recorded during the first quarter of
fiscal year 2009. All earthquakes were considered as "minor" with magnitudes (Mc) less than 1.0.
Two earthquakes were located at shallow depths (less than 4 km), most likely in the Columbia River
basalts; five earthquakes at intermediate depths (between 4 and 9 km), most likely in the sub-basalt
sediments); and three earthquakes were located at depths greater than 9 km, within the basement.
Geographically, four earthquakes occurred in known swarm areas and six earthquakes were classified as
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Rohay, Alan C.; Sweeney, Mark D.; Hartshorn, Donald C.; Clayton, Ray E. & Devary, Joseph L. First Quarter Hanford Seismic Report for Fiscal Year 2009, report, March 15, 2009; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc932191/m1/4/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.