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Science 11 March 2005:
Vol. 307. no. 5715, pp. 1615 - 1618
DOI: 10.1126/science.1108339
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Reports

High-Resolution Surface-Wave Tomography from Ambient Seismic Noise

Nikolai M. Shapiro,1* Michel Campillo,2 Laurent Stehly,2 Michael H. Ritzwoller1

Cross-correlation of 1 month of ambient seismic noise recorded at USArray stations in California yields hundreds of short-period surface-wave group-speed measurements on interstation paths. We used these measurements to construct tomographic images of the principal geological units of California, with low-speed anomalies corresponding to the main sedimentary basins and high-speed anomalies corresponding to the igneous cores of the major mountain ranges. This method can improve the resolution and fidelity of crustal images obtained from surface-wave analyses.

1 Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Boulder, CO, USA.
2 Laboratoire de Géophysique Interne et de Tectonophysique, Université Joseph Fourier, Grenoble, France.

* To whom correspondence should be addressed. E-mail: nshapiro{at}ciei.colorado.edu

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