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TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Second Quarter 2009 .....................................................................1 <br />Surnmary .............................................................................................................................. I <br />Introduction .......................................................................................................................... l <br />Network Operations ............................................................................................................. I <br />Data Processing ....................................................................................................................2 <br />Identification of Events .............................................................................................2 <br />Location Methodology ..............................................................................................3 <br />Magnitude Estimation ...............................................................................................4 <br />Results ..................................................................................................................................4 <br />Seismic Event Locations ..........................................................................................4 <br />Seismic Event Magnitudes .......................................................................................5 <br />Recorded Peak Ground Accelerations .....................................................................5 <br />Acknowledgments ................................................................................................................6 <br />References ............................................................................................................................6 <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 April to 30 June 2009 <br />3 PGA Values for Q3 2007 to Q2 2009 Shown With McGarr and Fletcher (2005) <br />Attenuation Relationships <br />• <br /> <br /> <br />UM WAx_wds\PROJECTSWorth Fork-Bowie\Quarterly reports\2009 Q2\Q2_2009_BRL.doc\0AK 1