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Predicting short-period, wind-wave-generated seismic noise in coastal regions

Gimbert, Florent and Tsai, Victor C. (2015) Predicting short-period, wind-wave-generated seismic noise in coastal regions. Earth and Planetary Science Letters, 426 . pp. 280-292. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20150707-153131318

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Abstract

Substantial effort has recently been made to predict seismic energy caused by ocean waves in the 4–10 s period range. However, little work has been devoted to predict shorter period seismic waves recorded in coastal regions. Here we present an analytical framework that relates the signature of seismic noise recorded at 0.6–2 s periods (0.5–1.5 Hz frequencies) in coastal regions with deep-ocean wave properties. Constraints on key model parameters such as seismic attenuation and ocean wave directionality are provided by jointly analyzing ocean-floor acoustic noise and seismic noise measurements. We show that 0.6–2 s seismic noise can be consistently predicted over the entire year. The seismic noise recorded in this period range is mostly caused by local wind-waves, i.e. by wind-waves occurring within about 2000 km of the seismic station. Our analysis also shows that the fraction of ocean waves traveling in nearly opposite directions is orders of magnitude smaller than previously suggested for wind-waves, does not depend strongly on wind speed as previously proposed, and instead may depend weakly on the heterogeneity of the wind field. This study suggests that wind-wave conditions can be studied in detail from seismic observations, including under specific conditions such as in the presence of sea ice.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2015.06.017DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X15003738PublisherArticle
ORCID:
AuthorORCID
Gimbert, Florent0000-0001-7350-3563
Tsai, Victor C.0000-0003-1809-6672
Additional Information:© 2015 Elsevier B.V. Received 19 March 2015; Received in revised form 5 June 2015; Accepted 6 June 2015; Available online 7 July 2015. This study was partially funded by Stanback Discovery Fund for Global Environmental Science and NSF grant EAR-1453263. We thank two anonymous reviewers for helpful reviews.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Stanback Discovery Fund for Global Environmental ScienceUNSPECIFIED
NSFEAR-1453263
Subject Keywords:ocean waves; seismic noise; directional spectra; wind
Record Number:CaltechAUTHORS:20150707-153131318
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150707-153131318
Official Citation:Florent Gimbert, Victor C. Tsai, Predicting short-period, wind-wave-generated seismic noise in coastal regions, Earth and Planetary Science Letters, Volume 426, 15 September 2015, Pages 280-292, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2015.06.017. (http://www.sciencedirect.com/science/article/pii/S0012821X15003738)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58797
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Jul 2015 23:54
Last Modified:23 Nov 2016 19:22

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