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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Fourth Quarter 2009 ........................................ ..............................1 <br />Summary................................................................................................ ..............................1 <br />Introduction........................................................................................... ............................... l <br />NetworkOperations ............................................................................... ..............................1 <br />DataProcessing ...................................................................................... ..............................2 <br />Identification of Events .............................................................. ..............................2 <br />LocationMethodology ............................................................... ..............................3 <br />MagnitudeEstimation ................................................................ ..............................4 <br />Results.............................................................. ............................... <br />Seismic Event Locations ...................... ............................... <br />Seismic Event Magnitudes ................... ............................... <br />Recorded Peak Ground Accelerations . ............................... <br />Acknowledgments............................................ ............................... <br />References ------ ---- -------- - - - - -- <br />Tables <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 Relocated Seismicity, 1 October to 31 December 2009 <br />.........................4 <br />.........................4 <br />.........................5 <br />.........................5 <br />.........................6 <br />.........................6 <br />3 PGA Values for Q3 2007 to Q4 2009 Shown With McGarr and Fletcher (2005) <br />Attenuation Relationships <br />• <br />C <br />• <br />U W1x_wds\PROJECTSWorth Fork- Bowie\Quarterly reports\2009 Q4 \Q4 2009 BRL.doc \OAK 1 <br />