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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Second Quarter 2010 .....................................................................1 <br />Summary ..............................................................................................................................1 <br />Introduction .......................................................................................................................... l <br />Network Operations .............................................................................................................1 <br />Data Processing ....................................................................................................................2 <br />Identification of Events ............................................................................................2 <br />Location Methodology .............................................................................................3 <br />Magnitude Estimation ..............................................................................................4 <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 April to 30 June 2010 <br />W:\X WCFS\PROJECTS\WEST ELK-MTN COAL\2010 Q2\Q2_2010_MCC.DOC\31-AUG10\\OAK i