%0 Journal Article %1 thurber_etal:2003 %A Thurber, C. %A Roecker, S. %A Roberts, K. %A Gold, M. %A Powell, L. %A Rittger, K. %D 2003 %J Geophysical Research Letters %K geophysics seismology %N 3 %P 1112 %R 10.1029/2002GL016004 %T Earthquake locations and three-dimensional fault structure along the creeping section of the San Andreas fault near Parkfield, CA: Preparing for SAFOD %U http://dx.doi.org/10.1029/2002GL016004 %V 30 %X Arrival-time data from 453 local earthquakes and 6 explosions at Parkfield, CA, are inverted for earthquake locations and three-dimensional Vp and Vp/Vs structure. The structure is dominated by the velocity contrast across the SAF, with the southwest side about 20-25\% faster, consistent with previous studies. Nearly all the earthquakes occur almost directly beneath the fault trace. We find high-Vp/Vs anomalies that correlate with low-resistivity features in a magnetotelluric model that are interpreted to represent fluids. We locate a magnitude 2 earthquake that is a potential target event for the final stage of SAFOD drilling, yielding a depth of 3.1 km below surface and an epicenter 100 m southwest of the fault trace. Nonlinear analyses indicate 95\%-confidence relative and absolute uncertainties on the order of 500-700 m vertically and 200-300 m horizontally for this target earthquake.

@article{thurber_etal:2003, abstract = {Arrival-time data from 453 local earthquakes and 6 explosions at Parkfield, CA, are inverted for earthquake locations and three-dimensional Vp and Vp/Vs structure. The structure is dominated by the velocity contrast across the SAF, with the southwest side about 20-25\% faster, consistent with previous studies. Nearly all the earthquakes occur almost directly beneath the fault trace. We find high-Vp/Vs anomalies that correlate with low-resistivity features in a magnetotelluric model that are interpreted to represent fluids. We locate a magnitude 2 earthquake that is a potential target event for the final stage of SAFOD drilling, yielding a depth of 3.1 km below surface and an epicenter 100 m southwest of the fault trace. Nonlinear analyses indicate 95\%-confidence relative and absolute uncertainties on the order of 500-700 m vertically and 200-300 m horizontally for this target earthquake.}, added-at = {2012-09-01T13:08:21.000+0200}, author = {Thurber, C. and Roecker, S. and Roberts, K. and Gold, M. and Powell, L. and Rittger, K.}, biburl = {https://www.bibsonomy.org/bibtex/265dc408b01364eaf1cc1d43b856190c7/nilsma}, day = 5, doi = {10.1029/2002GL016004}, interhash = {11e7183110ede35120fa320884746535}, intrahash = {65dc408b01364eaf1cc1d43b856190c7}, issn = {0094-8276}, journal = {Geophysical Research Letters}, keywords = {geophysics seismology}, month = feb, number = 3, pages = 1112, timestamp = {2021-02-09T13:26:58.000+0100}, title = {Earthquake locations and three-dimensional fault structure along the creeping section of the San Andreas fault near Parkfield, CA: Preparing for SAFOD}, url = {http://dx.doi.org/10.1029/2002GL016004}, volume = 30, year = 2003 }