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Published June 28, 2012 | Published + Supplemental Material
Journal Article Open

Joint inversion of Rayleigh wave phase velocity and ellipticity using USArray: Constraining velocity and density structure in the upper crust


Rayleigh wave ellipticity, or H/V ratio, observed on the surface is particularly sensitive to shallow earth structure. In this study, we jointly invert measurements of Rayleigh wave H/V ratio and phase velocity between 24–100 and 8–100 sec period, respectively, for crust and upper mantle structure beneath more than 1000 USArray stations covering the western United States. Upper crustal structure, in particular, is better constrained by the joint inversion compared to inversions based on phase velocities alone. In addition to imaging Vs structure, we show that the joint inversion can be used to constrain Vp/Vs and density in the upper crust. New images of uppermost crustal structure (<3 km depth) are in excellent agreement with known surface features, with pronounced low Vs, low density, and high Vp/Vs anomalies imaged in the locations of several major sedimentary basins including the Williston, Powder River, Green River, Denver, and San Juan basins. These results demonstrate not only the consistency of broadband H/V ratios and phase velocity measurements, but also that their complementary sensitivities have the potential to resolve density and Vp/Vs variations.

Additional Information

© 2012 American Geophysical Union. Received 27 April 2012; accepted 23 May 2012; published 21 June 2012. Instruments (data) used in this study were made available through EarthScope (EAR-0323309), supported by the National Science Foundation. The facilities of the IRIS Data Management System (EAR-0552316) were used for access the waveform and metadata required in this study. The authors are grateful to Donald Forsyth and an anonymous reviewer for comments that helped to improve this paper. This research was supported by the Director's Post-Doctoral Fellowship of the Seismological Laboratory at the California Institute of Technology and the Gordon and Betty Moore Foundation. The Editor thanks the two anonymous reviewers for assisting in the evaluation of this paper.

Attached Files

Supplemental Material - 2012gl052196-fs01.pdf

Supplemental Material - 2012gl052196-ts01.pdf

Published - Lin2012p18921Geophys_Res_Lett.pdf


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August 22, 2023
August 22, 2023