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E <br />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 />Mining Progress .................................................. <br />Seismic Event Locations ..................................... <br />Seismic Event Magnitudes .................................. <br />Recorded Peak Ground Accelerations ................ <br />Acknowledgments ........................................................... <br />References ....................................................................... <br />Tables <br />.....................................................1 <br />.....................................................1 <br />..................................................... l <br />.....................................................2 <br />.....................................................2 <br />.....................................................3 <br />.....................................................4 <br />.....................................................4 <br />.....................................................4 <br />.....................................................4 <br />.....................................................5 <br />.....................................................5 <br />.....................................................6 <br />.....................................................7 <br />1 Seismograph Stations of the North Fork Valley Seismic Network <br />2 Velocity Model Used in Locating Seismic Events <br />3 Event Locations and Maximum Recorded PGAs <br />Figures <br />1 Seismic Station Locations, Permit Areas, and Mine Location Map <br />2 Monthly Mining Progress <br />3 Relocated Seismicity, 1 October to 31 December 2007 <br />4 Coal Bump and Fault Map, East Mains Development <br />5 PGA Values for Q4 2007 Shown With McGarr and Fletcher (2005) Attenuation <br />Relationship <br />UM WAx_wdsTROJECTMNorth Fork-Bowie\Quarterly reports\2007 Q4\04 Final Report 030308\Q4_2007_BRL_Final_030308.doc\OAK i