Lin, Fan-Chi and Tsai, Victor C. and Schmandt, Brandon (2014) 3-D crustal structure of the western United States: application of Rayleigh-wave ellipticity extracted from noise cross-correlations. Geophysical Journal International, 198 (2). pp. 656-670. ISSN 0956-540X. http://resolver.caltech.edu/CaltechAUTHORS:20140613-160117253
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We present a new 3-D seismic model of the western United States crust derived from a joint inversion of Rayleigh-wave phase velocity and ellipticity measurements using periods from 8 to 100 s. Improved constraints on upper-crustal structure result from use of short-period Rayleigh-wave ellipticity, or Rayleigh-wave H/V (horizontal to vertical) amplitude ratios, measurements determined using multicomponent ambient noise cross-correlations. To retain the amplitude ratio information between vertical and horizontal components, for each station, we perform daily noise pre-processing (temporal normalization and spectrum whitening) simultaneously for all three components. For each station pair, amplitude measurements between cross-correlations of different components (radial–radial, radial–vertical, vertical–radial and vertical–vertical) are then used to determine the Rayleigh-wave H/V ratios at the two station locations. We use all EarthScope/USArray Tranportable Array data available between 2007 January and 2011 June to determine the Rayleigh-wave H/V ratios and their uncertainties at all station locations and construct new Rayleigh-wave H/V ratio maps in the western United States between periods of 8 and 24 s. Combined with previous longer period earthquake Rayleigh-wave H/V ratio measurements and Rayleigh-wave phase velocity measurements from both ambient noise and earthquakes, we invert for a new 3-D crustal and upper-mantle model in the western United States. Correlation between the inverted model and known geological features at all depths suggests good resolution in five crustal layers. Use of short-period Rayleigh-wave H/V ratio measurements based on noise cross-correlation enables resolution of distinct near surface features such as the Columbia River Basalt flows, which overlie a thick sedimentary basin.
|Additional Information:||© 2014 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. First published online: May 31, 2014. The data used in this research were obtained from the IRIS Data Management Center and originate predominantly from the Transportable Array component of USArray. The authors are grateful to the editor Yehuda Ben-Zion, Vedran Lekic and an anonymous reviewer for comments that helped improve this paper. This research was supported by a grant from the U.S. National Science Foundation, grant EAR-1252191.|
|Subject Keywords:||Interferometry; Surface waves and free oscillations; Seismic tomography; Wave propagation; Crustal structure; North America|
|Official Citation:||Fan-Chi Lin, Victor C. Tsai, and Brandon Schmandt 3-D crustal structure of the western United States: application of Rayleigh-wave ellipticity extracted from noise cross-correlations Geophys. J. Int. (August, 2014) 198 (2): 656-670 first published online May 31, 2014 doi:10.1093/gji/ggu160|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||13 Jun 2014 23:11|
|Last Modified:||23 Nov 2016 19:36|
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