Phase velocities from seismic noise using beamforming and cross correlation in Costa Rica and Nicaragua

被引：77

作者：

Harmon, Nicholas ^{[1
]}

Gerstoft, Peter ^{[1
]}

Rychert, Catherine A. ^{[1
]}

Abers, Geoffrey A. ^{[2
]}

de la Cruz, Mariela Salas ^{[3
]}

Fischer, Karen M. ^{[3
]}

机构：

[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

[2] Columbia Univ, Earth Inst, Lamont Doherty Earth Observ, Palisades, NY 10964 USA

[3] Brown Univ, Providence, RI 02912 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 19期

关键词：

D O I：

10.1029/2008GL035387

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

An expression for the cross correlation of noise between seismic stations and the 2D Green's function is derived assuming that noise travels as 2D surface waves. The phase velocity is obtained directly from the noise correlation function with a phase shift of +pi/4. Mean phase velocity dispersion curves are calculated for the TUCAN seismic array in Costa Rica and Nicaragua from ambient seismic noise using two independent methods, noise cross correlation and beamforming. The noise cross correlation and beamforming methods are compared and contrasted by evaluating results from the TUCAN array. The results of the two methods as applied to the TUCAN array agree within 1%, giving good confidence in the phase velocities extracted from noise.

引用

页数：6

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