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North Fork Valley Seismic Network — Third Quarter 2010
<br />Table 3 when available, along with the station that recorded the ground motion and the event -to-
<br />station distance. The largest PGA recorded during the third quarter was 0.012 g at station FGH
<br />for a M 1.9 event at a distance of approximately 0.88 km (0.55 mi). This event occurred on 15
<br />August 2010 07:08 GMT at the Oxbow Mine. The largest PGA recorded at the West Elk Mine
<br />was 0.004 g at station MCD resulting from the 4 September 22:41 GMT M 2.3 seismic event
<br />that occurred at a distance of approximately 1.90 kin (1. 18 mi). Note distances are approximate
<br />given uncertainties in the event locations due to uncertainties in the velocity model used in the
<br />relocations.
<br />ACKNOWLEDGMENTS
<br />The NFVSN data analysis and evaluation are jointly supported by MCC and BRL. Our thanks to
<br />Wendell Koontz, MCC Project Manager, and Jim Abshire, BRL Project Manager for their
<br />support. Our appreciation to Pete Swanson (NIOSH/CDS) for his operation and maintenance of
<br />the network. Our thanks to Melinda Lee for her assistance in the preparation of this report.
<br />REFERENCES
<br />Banfill, R., 1995, PC -SUDS Utilities, A collection of tools for routine processing of seismic data
<br />stored in the seismic unified data system for DOS (PC- SUDS).
<br />Johnson, C.E., Bittenbinder, A., Bogaert B., Dietz L., and Kohler W., 1995, EW: A Flexible
<br />Approach to Seismic Network Processing: IRIS Newsletter, v. 14, no. 2, p. 1 -4.
<br />Koontz, W., 2007, Memorandum on the West Elk Mine B Seam Bounce on November 17, 2007,
<br />2 p.
<br />Swanson, P. and Koontz, W., 2006, Measurement and analysis of mining induced seismic
<br />ground motion in the vicinity of the West Elk Coal Mine, Somerset, CO (abstract):
<br />Seismological Research Letters, v. 77, no. 2, p. 318.
<br />Swanson, P., Stewart, C., and Koontz, W., 2007, Installation of a digital, wireless, strong - motion
<br />network for monitoring seismic activity in a western Colorado coal mining region,
<br />Proceedings of the 20th Symposium on Application of Geophysics to Engineering and
<br />Environmental Problems (SAGEEP), Environmental and Engineering Geophysical
<br />Society, p. 559 -565.
<br />Wong, I.G. and McGarr, A., 1990, Implosional failure in mining- induced seismicity: A critical
<br />review, in Rockbursts and Seismicity in Mines, Proceedings of the Second International
<br />Symposium, C. Fairhurst (ed.), A.A. Balkema Publishers, p. 45 -51.
<br />WAX_WCFS \PROJECTS \WEST ELK -MTN COAL \2010 Q3 \Q3_2010_MCC.DOC\11- JAN -11\ \OAK 5
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