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Higher-mode ambient-noise Rayleigh waves in sedimentary basins

Ma, Yiran and Clayton, Robert W. and Li, Dunzhu (2016) Higher-mode ambient-noise Rayleigh waves in sedimentary basins. Geophysical Journal International, 206 (3). pp. 1634-1644. ISSN 0956-540X. doi:10.1093/gji/ggw235.

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We show that higher modes are an important component of high-frequency Rayleigh waves in the cross-correlations over sedimentary basins. The particle motions provide a good test for distinguishing and separating the fundamental from the first higher mode, with the fundamental mode having retrograde and the first higher mode having prograde motion in the 1–10 s period of interest. The basement depth controls the cut-off period of the first higher mode, which coincides with a rapid increase (over period) in the particle-motion ellipticity or H/V ratio of the fundamental mode. The strong higher mode we observed is not only due to the low-velocity sedimentary layer but also due to the noise sources with significant radial component such as the basin edge scattering. It is important to correctly identify the mode order when inverting the dispersion curves because misidentifying the higher mode as fundamental will lead to an anomalous high V_(SV) velocity.

Item Type:Article
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URLURL TypeDescription Information
Ma, Yiran0000-0002-8369-3310
Clayton, Robert W.0000-0003-3323-3508
Li, Dunzhu0000-0003-3149-0236
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. Accepted 2016 June 20. Received 2016 June 18; in original form 2016 January 21. First published online: June 24, 2016. We thank Mich Barklage and Dan Hollis from NodalSeismic, Paul Davis and Igor Stubailo from UCLA, Elizabeth Cochran from USGS, Jacha Polet from Cal Poly Pomona, and several grad students for their participation in the LASSIE experiment. We thank Victor Tsai at Caltech for useful discussions. We also thank two anonymous reviewers for their helpful comments. This work was partially supported by the USGS Earthquake Science Center/Caltech Cooperative Agreement G14AC00109 and by SCEC award #15018.
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)15018
Subject Keywords:Interferometry; Surface waves and free oscillations; Wave propagation
Issue or Number:3
Record Number:CaltechAUTHORS:20160819-084824753
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Official Citation:Yiran Ma, Robert W. Clayton, and Dunzhu Li Higher-mode ambient-noise Rayleigh waves in sedimentary basins Geophys. J. Int. (September, 2016) 206 (3): 1634-1644 first published online June 24, 2016 doi:10.1093/gji/ggw235
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69768
Deposited By: Tony Diaz
Deposited On:22 Aug 2016 22:13
Last Modified:11 Nov 2021 04:19

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