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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Third Quarter 2009 .........................................................................1 <br />Summary ............................................................... <br />Introduction ........................................................... <br />Network Operations .............................................. <br />Data Processing ..................................................... <br />Identification of Events ............................. <br />L t* Mthdl <br />............................................................1 <br />............................................................ l <br />oca ion e o 0 ogy ............................................ <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 />............................................. I <br />..............................................2 <br />..............................................2 <br />..............................................3 <br />................ ..........................4 <br />..............................................4 <br />..............................................4 <br />..............................................4 <br />.......................5 <br />..............................................6 <br />..............................................6 <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 July to 30 September 2009 <br />3 PGA Values for Q3 2007 to Q3 2009 Shown With McGarr and Fletcher (2005) <br />Attenuation Relationships <br />• <br />• <br />r: <br />u WAx_wds\PROJECTSWorth Fork-Bowie\Quarterly reports\2009 Q3\Q3_2009_BRL.doc\OAK 1