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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Fourth Quarter 2007 ......................................................................1 <br />Summary ...................................................................... <br />Introduction .................................................................. <br />Network Operations ..................................................... <br />Data Processing ............................................................ <br />Identification of Events .................................... <br />Location Methodology ..................................... <br />Magnitude Estimation ...................................... <br />Results .......................................................................... <br />Seismic Event Locations ................................... <br />Seismic Event Magnitudes ................................ <br />Recorded Peak Ground Accelerations ............... <br />Acknowledgments ........................................................ <br />References .................................................................... <br />Tables <br />1 <br />2 <br />3 <br />Figures <br />1 <br />2 <br />.....................................................1 <br />.....................................................1 <br />.....................................................1 <br />.....................................................2 <br />.....................................................2 <br />.....................................................3 <br />.....................................................3 <br />.....................................................4 <br />.....................................................4 <br />.....................................................4 <br />.....................................................4 <br />.....................................................5 <br />.....................................................5 <br />Seismograph Stations of the North Fork Valley Seismic Network <br />Velocity Model Used in Locating Earthquakes <br />Event Locations and Maximum Recorded PGAs <br />Seismic Station Locations, Permit Area, and Mine Location Map <br />Relocated Seismicity, 1 October to 31 December 2007 <br />UMS W:\X WCFS\PROJECTS\WEST ELK-MTN COAL\2007 Q4\Q4 2007 MCC FINAL.DOC\22-FEB-OROAK i