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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - First Quarter 2010 .......................................................................... 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 .............................................................................................. 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 January to 31 March 2010 <br />um W:\X_WCFS\PROJECTS\WEST ELK-MTN COAL\2010 Q1\Q1_2010_MCC.DOC\31-AUG-10\\OAK i