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Ambient noise cross-correlation observations of fundamental and higher-mode Rayleigh wave propagation governed by basement resonance

Savage, Martha K. and Lin, Fan-Chi and Townend, John (2013) Ambient noise cross-correlation observations of fundamental and higher-mode Rayleigh wave propagation governed by basement resonance. Geophysical Research Letters, 40 (14). pp. 3556-3561. ISSN 0094-8276. doi:10.1002/grl.50678. https://resolver.caltech.edu/CaltechAUTHORS:20130923-085942634

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Abstract

Measurement of basement seismic resonance frequencies can elucidate shallow velocity structure, an important factor in earthquake hazard estimation. Ambient noise cross correlation, which is well-suited to studying shallow earth structure, is commonly used to analyze fundamental-mode Rayleigh waves and, increasingly, Love waves. Here we show via multicomponent ambient noise cross correlation that the basement resonance frequency in the Canterbury region of New Zealand can be straightforwardly determined based on the horizontal to vertical amplitude ratio (H/V ratio) of the first higher-mode Rayleigh waves. At periods of 1–3 s, the first higher-mode is evident on the radial-radial cross-correlation functions but almost absent in the vertical-vertical cross-correlation functions, implying longitudinal motion and a high H/V ratio. A one-dimensional regional velocity model incorporating a ~ 1.5 km-thick sedimentary layer fits both the observed H/V ratio and Rayleigh wave group velocity. Similar analysis may enable resonance characteristics of other sedimentary basins to be determined.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/grl.50678 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/grl.50678/abstractPublisherArticle
Additional Information:© 2013 American Geophysical Union. Received 9 May 2013; revised 14 June 2013; accepted 17 June 2013; published 19 July 2013. This work was funded by grants from the New Zealand Earthquake Commission, the New Zealand Marsden Fund, U.S. National Science Foundation, and GNS Science. F. Lin was supported by the Director’s Post-Doctoral Fellowship of the Seismological Laboratory at the California Institute of Technology and NSF grant EAR-1252191. GNS Science Wairakei, University of Auckland and PASSCAL RAMP provided instrumentation. M. Henderson, K. Allan, A. Zaino, J. Eccles, K. Jacobs, C. Boese, R. Davy, A. Wech, N. Lord, and A. Carrizales helped in the field and with organizing the data. Z. Rawlinson, P. Malin, and B. Fry helped plan station locations. F. Brenguier provided cross-correlation codes. Y. Behr and C. Juretzek provided further codes and initial analysis of vertical-component seismograms. C. Thurber and E. Syracuse helped plan and carry out the deployment. F. Ghisetti and R. Sibson provided the color version of their basement depth map used as a background in Figure 1.
Funders:
Funding AgencyGrant Number
New Zealand Earthquake CommissionUNSPECIFIED
New Zealand Marsden FundUNSPECIFIED
GNS ScienceUNSPECIFIED
Caltech Seismological Laboratory Director’s Post-Doctoral FellowshipUNSPECIFIED
NSFEAR-1252191
Issue or Number:14
DOI:10.1002/grl.50678
Record Number:CaltechAUTHORS:20130923-085942634
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130923-085942634
Official Citation:Savage, M. K., F.-C. Lin, and J. Townend (2013), Ambient noise cross-correlation observations of fundamental and higher-mode Rayleigh wave propagation governed by basement resonance, Geophys. Res. Lett., 40, 3556–3561, doi:10.1002/grl.50678
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41465
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Sep 2013 17:53
Last Modified:10 Nov 2021 04:30

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