High-Resolution Surface-Wave Tomography from Ambient Seismic Noise

Author:

Shapiro Nikolai M.12,Campillo Michel12,Stehly Laurent12,Ritzwoller Michael H.12

Affiliation:

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.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference33 articles.

1. USArray (www.iris.iris.edu/USArray) is one of the components of the new EarthScope (www.earthscope.org) initiative in the United States. PASSCAL (www.iris.edu/about/PASSCAL) is a program of the Incorporated Research Institutions for Seismology (IRIS) (www.iris.edu).

2. Wave front healing and the evolution of seismic delay times

3. The effect of scattering in surface wave tomography

4. M. H. Ritzwoller, N. M. Shapiro, M. P. Barmin, A. L. Levshin, J. Geophys. Res.107, 2235 (2002).

5. Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise

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