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Authors: Nadeau, R. M.* 
Michelini, A.* 
Uhrhammer, R. A.* 
Dolenc, D.* 
McEvilly, T. V.* 
Title: Detailed kinematics, structure and recurrence of micro-seismicity inthe SAFOD target region
Issue Date: 2004
Series/Report no.: /31(2004)
DOI: 10.1029/2003GL019409
Keywords: Detailed kinematics,
Subject Classification04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous 
Abstract: Large numbers of small earthquakes recorded over 2 decades and analyzed with advanced techniques are used to characterize the detailed kinematics, structure and recurrence interval scaling properties of micro-seismicity in a 4 4 km lateral and 6 km deep crustal volume encompassing the region of the SAFOD deep drilling experiment. The characterization reveals that the seismically active San Andreas fault in the vicinity of SAFOD’s repeating magnitude 2 target earthquakes is composed of two sub-parallel fault strands that are creeping at comparable rates and that one of the strands lies between the SAFOD drilling platform and SAFOD’s target events. In the region, 55% of the earthquakes are members of 52 characteristically repeating earthquake sequences. The recurrence intervals of the repeating target events are consistent with the interval scaling of the other sequences. However this scaling is contrary to that expected from standard constant stress-drop theory.
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