Structure of the San Andreas Fault at SAFOD from P-wave tomography and fault-guided wave mapping

被引：20

作者：

Malin, Peter ^{[1
]}

Shalev, Eylon ^{[1
]}

Balven, Heather ^{[1
]}

Lewis-Kenedi, Catherine ^{[1
]}

机构：

[1] Duke Univ, Nicholas Sch Environm & Earth Sci, Div Earth & Ocean Sci, Durham, NC 27708 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 13期

关键词：

D O I：

10.1029/2006GL025973

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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 similar to 2 km north and 3 km south of the SAFOD site. This similar to 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.

引用

页数：3

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