First Quarter Hanford Seismic Report for Fiscal Year 2010 [report]

Alan C. Rohay, Mark D. Sweeney, Donald C. Hartshorn, Ray E. Clayton, Joseph L. Devary
2010 unpublished
The Hanford Seismic Assessment Program (HSAP) provides an uninterrupted collection of highquality 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
more » ... na 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 Assessment Team. The Hanford Seismic Network recorded 81 local earthquakes during the first quarter of FY 2010. Sixty-five of these earthquakes were detected in the vicinity of Wooded Island, located about eight miles north of Richland just west of the Columbia River. The Wooded Island events recorded this quarter were a continuation of the swarm events observed during fiscal year 2009 and reported in previous quarterly and annual reports 2009a , 2009b , and 2009c . Most of the events were considered minor (coda-length magnitude [Mc] less than 1.0) with only 1 event in the 2.0-3.0 range; the maximum magnitude event (2.5 Mc) occurred on December 22 at depth 2.
doi:10.2172/982570 fatcat:yr3mbmo4xvfb5envfkar4mzpy4