Second and Third Quarter Hanford Seismic Report for Fiscal Year 2001 Page: 4 of 43
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Hanford Seismic Monitoring provides an uninterrupted collection of high-quality raw and processed
seismic data from the Hanford Seismic Network (HSN) for the U.S. Department of Energy and its con-
tractors. Hanford Seismic Monitoring also locates and identifies sources of seismic activity and monitors
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 assess-
ments, and engineering design and construction. In addition, the seismic monitoring organization works
with the Hanford Site Emergency Services Organization to provide assistance in the event of a significant
earthquake on the Hanford Site.
The HSN and the Eastern Washington Regional Network (EWRN) consist of 41 individual sensor
sites and 15 radio relay sites maintained by the Hanford Seismic Monitoring staff.
For the HSN, there were 333 triggers during the second quarter of fiscal year (FY) 2001 and 587 trig-
gers during the third quarter on the data acquisition system. Of these triggers, 153 were earthquakes
during the second quarter and 190 were earthquakes during the third quarter.
Nineteen earthquakes were located in the HSN area during the second quarter and 18 during the third
quarter. For the second and third quarters, respectively, 8 and 12 occurred in the Columbia River basalt, 5
and 0 were earthquakes in the pre-basalt sediments, and 6 and 6 were earthquakes in the crystalline base-
ment. Geographically, 14 earthquakes occurred in swarm areas in the second quarter and 8 in the third
quarter. No earthquakes were associated with major structures in the second quarter but 4 were in the
third quarter. There were 5 random events in the second quarter and 6 in the third quarter.
The February 28, 2001 Nisqually earthquake triggered the Hanford Strong Motion Accelerometers
during the second quarter of FY 2001. There were no triggers during the third quarter.
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Hartshorn, Donald C.; Reidel, Stephen P.; Rohay, Alan C. & Valenta, Michelle M. Second and Third Quarter Hanford Seismic Report for Fiscal Year 2001, report, September 28, 2001; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc935026/m1/4/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.