The SAFOD Pilot Hole seismic array: Wave propagation effects as a function of sensor depth and source location

被引：12

作者：

Chavarria, JA ^{[1
]}

Malin, PE ^{[1
]}

Shalev, E ^{[1
]}

机构：

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2004年 / 31卷 / 12期

关键词：

D O I：

10.1029/2003GL019382

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

In July 2002 we installed a vertical array of seismometers in the San Andreas Fault Observatory at Depth (SAFOD) Pilot Hole (PH). The bottom of this 32 level, 1240 m long array of 3-components is located at a depth of similar to2100 m below ground. Surface-explosion and microearthquake seismograms recorded by the array give valuable insights into the structure of the SAFOD site. The ratios of P- and S-wave velocities (Vp/Vs) along the array suggest the presence of two faults intersecting the PH. The Vp/Vs ratios also depend on source location, with high values to the NW, and lower ones to the SE, correlating with high and low creep rates along the SAF, respectively. Since higher ratios can be produced by increasing fluid saturation, we suggest that this effect might account for both our observations and their correlation with the creep distribution.

引用

页码：L12S071 / 5

页数：5

共 17 条

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