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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - First Quarter 2008 ..........................................................................1 <br />Summary ..............................................................................................................................1 <br />Introduction ..........................................................................................................................1 <br />Network Operations .............................................................................................................1 <br />Data Processing ....................................................................................................................2 <br />Identification of Events ............................................................................................2 <br />Location Methodology .............................................................................................3 <br />Magnitude Estimation ..............................................................................................3 <br />Results ....................................................................................... <br />Seismic Event Locations ................................................ <br />Seismic Event Magnitudes ............................................. <br />Recorded Peak Ground Accelerations ............................ <br />Acknowledgments ..................................................................... <br />References ................................................................................. <br />Tables <br />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 />Seismic Station Locations, Permit Area, and Mine Location Map <br />2 Relocated Seismicity, 1 January to 31 March 2008 <br />..................4 <br />..................4 <br />..................4 <br />..................4 <br />..................5 <br />..................5 <br />EW W:V(_WCFS\PROJECTS\WEST ELK-MTN COAL\2008 Q1\Q1_2008 MCC_FINAL.DOC\16-MAY-08\\OAK i