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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L13314,
3 PP., 2006
doi:10.1029/2006GL025973
Structure of the San Andreas Fault at SAFOD from P-wave tomography and fault-guided wave mapping
Nicholas School of the Environment and Earth Sciences, Division of Earth and Ocean Sciences, Duke University, Durham, North Carolina, USA
Nicholas School of the Environment and Earth Sciences, Division of Earth and Ocean Sciences, Duke University, Durham, North Carolina, USA
Nicholas School of the Environment and Earth Sciences, Division of Earth and Ocean Sciences, Duke University, Durham, North Carolina, USA
Nicholas School of the Environment and Earth Sciences, Division of Earth and Ocean Sciences, Duke University, Durham, North Carolina, USA
Fault-guided waves reveal a low-velocity fault segment a few hundred meters southwest of the main strand of the San Andreas Fault (SAF) system. In 2004, the San Andreas Fault Observatory at Depth (SAFOD) Main Hole was drilled 2.5 km underground and 0.7 km west of the SAF surface trace. A 3-component, 4.5-Hz seismograph was installed near the bottom of this hole. This instrument recorded fault zone guided (Fg) waves originating from earthquakes along the main SAF ∼2 km north and 3 km south of the SAFOD site. This ∼5 km length corresponds to a distinctive low-velocity structure imaged in 2003 using microearthquakes recorded on the Pilot Hole array. Because this structure transmits Fg-waves from the main fault, it is probably connected to the main SAF and is most likely a major, unmapped fault.
Received 6 February 2006; accepted 21 March 2006; published 15 July 2006.
Citation: (2006), Structure of the San Andreas Fault at SAFOD from P-wave tomography and fault-guided wave mapping, Geophys. Res. Lett., 33, L13314, doi:10.1029/2006GL025973.
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