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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Fourth Quarter 2010 ........................................ ..............................1 <br />Summary............................................................................................... ............................... l <br />Introduction............................................................................................ ..............................1 <br />NetworkOperations ............................................................................... ..............................1 <br />DataProcessing ...................................................................................... ..............................3 <br />Identification of Events .............................................................. ..............................3 <br />LocationMethodology ............................................................... ..............................3 <br />MagnitudeEstimation ................................................................ ..............................4 <br />Results.................................................................................................... ..............................4 <br />Seismic Event Locations ............................................................ ..............................4 <br />Seismic Event Magnitudes ......................................................... ..............................5 <br />Recorded Peak Ground Accelerations ....................................... ..............................5 <br />Acknowledgments................................................................................. ............................... <br />5 <br />References.............................................................................................. ..............................5 <br />Tables <br />1 Seismograph Stations of the North Fork Valley Seismic Network <br />2 Velocity Model Used in Locating Earthquakes <br />3 Event Locations and Maximum Recorded PGAs <br />Figures <br />1 Seismic Station Locations, Permit Area, and Mine Location Map <br />2 Relocated Seismicity, 1 October to 31 December 2010 <br />1W WAX_WCFS \PROJECTS \WEST ELK -MTN COAL \2010 Q4 \Q4_2010_ MCC.DOC \18- MAR -11\ \OAK i <br />