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Changes in array parameters (such as station delays and the velocity model) should be based on
<br />good coverage of the area of interest with events and on a large number of events. As the mining
<br />by MCC progresses to the south, these criteria will be more closely satisfied and adjustments can
<br />be made.
<br />CONCLUSIONS The seismic network is operational. The seismic activity in the North Fork Valley
<br />is being recorded and the largest events are processed in a preliminary fashion. Station delays to
<br />account for station elevation differences will be necessary to precisely correlate the events with the
<br />mining activity.
<br />References:
<br />Brown, Steve, Geotechnical evaluation of mine-induced seismicity on Monument Dam, Delta
<br />County, Colorado, 2005, GEI Consultants, Inc., Englewood, Colorado 80112, 2005.
<br />Huzjak, Robert J., Geotechnical evaluation of mine-induced seismicity on Bruce Park Dam, Delta
<br />County, Colorado, 2002, GEI Consultants, Inc., Englewood, Colorado 80112, 2002.
<br />Johnson, L., and Butler, David, 1975, Prediction analysis applied to local hypocenter location,
<br />Soc.Exp. Geop., (abstract), 45th Annual International Meeting, Denver, Colorado,
<br />October12-16,1975.
<br />Swanson, P. and W. Koontz, Measurement and Analysis of Mining-Induced Seismic Ground
<br />Motion in the Vicinity of the West Elk Coal Mine, Somerset, CO (abstract), Seism. Res. Lett., v. 77,
<br />no.2, p. 318, 2006.
<br />Thatcher, Wayne, A note of discrepancies between local magnitude (ML) and microearthquake
<br />magnitude scales, Bull. Seis. Soc. Am. 1973, v. 63, no. 1, p. 313-318, 1973.
<br />Wald, David J.,Vincent Quitoriano, Thomas H. Heaton, Hiroo Kanamori, Relationships between
<br />Peak Ground Acceleration, Peak Ground Velocity and Modified Mercalli Intensity in California,
<br />Earthquake Spectra, v15, p. 557-564, 1999.
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