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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Third Quarter 2008 .........................................................................1 <br />Summary ..............................................................................................................................1 <br />Introduction .......................................................................................................................... I <br />Network Operations .............................................................................................................1 <br />Data Processing ....................................................................................................................2 <br />Identification of Events ............................................................................................2 <br />Location Methodology .............................................................................................3 <br />Magnitude Estimation ..............................................................................................3 <br />Results ..................................................................................................................................4 <br />Seismic Event Locations ...........................................................................................4 <br />Seismic Event Magnitudes ........................................................................................4 <br />Recorded Peak Ground Accelerations .......................................................................4 <br />Acknowledgments ................................................................................................................ 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 2008 <br />UM W:\X_WCFS\PROJECTS\WEST ELK-MTN COAL\2008 Q4\Q4_2008_MCC.DOC\17-FEB-091\OAK i