Cascadia Tremor Located Near Plate Interface Constrained by S Minus P Wave Times

被引：85

作者：

La Rocca, Mario ^{[1
]}

Creager, Kenneth C. ^{[2
]}

Galluzzo, Danilo ^{[1
]}

Malone, Steve ^{[2
]}

Vidale, John E. ^{[2
]}

Sweet, Justin R. ^{[2
]}

Wech, Aaron G. ^{[2
]}

机构：

[1] Ist Nazl Geofis & Vulcanol, Osserv Vesuviano, I-80124 Naples, Italy

[2] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA

来源：

SCIENCE | 2009年 / 323卷 / 5914期

基金：

美国国家科学基金会;

关键词：

NON-VOLCANIC TREMOR; EPISODIC TREMOR; EARTHQUAKES; SUBDUCTION; JAPAN;

D O I：

10.1126/science.1167112

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Nonvolcanic tremor is difficult to locate because it does not produce impulsive phases identifiable across a seismic network. An alternative approach to identifying specific phases is to measure the lag between the S and P waves. We cross- correlate vertical and horizontal seismograms to reveal signals common to both, but with the horizontal delayed with respect to the vertical. This lagged correlation represents the time interval between vertical compressional waves and horizontal shear waves. Measurements of this interval, combined with location techniques, resolve the depth of tremor sources within +/-2 kilometers. For recent Cascadia tremor, the sources locate near or on the subducting slab interface. Strong correlations and steady S- P time differences imply that tremor consists of radiation from repeating sources.

引用

页码：620 / 623

页数：4

共 23 条

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