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North Fork Valley Seismic Network — First Quarter 2010 <br />on 1 January 2010 07:14 GMT at the Bowie No. 2 Mine. The largest PGA recorded at the West <br />Elk Mine was 0.002 g at station WFW resulting from the 25 February 21:08 GMT M 1.8 <br />seismic event that occurred at a distance of approximately 1.58 km (0.98 mi). Note distances are <br />approximate given uncertainties in the event locations due to uncertainties in the velocity model <br />used in the 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 />W:\X_WCFS \PROJECTS \WEST ELK -MTN COAL \2010 Q1 \Q1_2010_ MCC. DOC \31- AUG -10\ \OAK 5 <br />