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Localized water reverberation phases and its impact on back-projection images

Yue, Han and Castellanos, Jorge C. and Yu, Chunquan and Meng, Lingsen and Zhan, Zhongwen (2017) Localized water reverberation phases and its impact on back-projection images. Geophysical Research Letters, 44 (19). pp. 9573-9580. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20170523-082116647

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Abstract

Coherent radiators imaged by backprojections (BP) are commonly interpreted as part of the rupture process. Nevertheless, artifacts introduced by structure related phases are rarely discriminated from the rupture process. In this study, we use a calibration event to discriminate between rupture and structure effects. We reexamine the waveforms and BP images of the 2012 M_w 7.2 Indian Ocean earthquake and a calibration event (M_w 6.2). The P wave codas of both events present similar shape with characteristic period of approximately 10 s, which are backprojected as coherent radiators near the trench. S wave BP does not image energy radiation near the trench. We interpret those coda waves as localized water reverberation phases excited near the trench. We perform a 2-D waveform modeling using realistic bathymetry model and find that the steep near-trench bathymetry traps the acoustic water waves forming localized reverberation phases. These waves can be imaged as coherent near-trench radiators with similar features as that in the observations. We present a set of methodologies to discriminate between the rupture and propagation effects in BP images, which can serve as a criterion of subevent identification.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2017GL073254DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2017GL073254/fullPublisherArticle
ORCID:
AuthorORCID
Yue, Han0000-0002-8888-2727
Castellanos, Jorge C.0000-0002-0103-6430
Yu, Chunquan0000-0001-8681-8572
Meng, Lingsen0000-0003-2428-0548
Zhan, Zhongwen0000-0002-5586-2607
Additional Information:© 2017 American Geophysical Union. Received 25 FEB 2017; Accepted 17 MAY 2017; Accepted article online 22 MAY 2017; Published online 3 OCT 2017. Data analysis and plotting made use of GMT and Matlab. The teleseismic data are recorded by GSN network and accessed through the IRIS data management center. F-net data are accessed through NIED, and the European data are accessed through Observatories and Research Facilities for European Seismology. We thank the extensive discussion with Hiroo Kanamori, Thorne Lay, Don Helmberger, Miyaki Ishii, Zach Ross, and Victor Tsai. We appreciate two anonymous reviewers for their constructive suggestions. This work is supported by National Basic Research Program of China grant 2012CB417301 and National Science Fundation of the United States grants 1447107 and ear1614609.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
National Basic Research Program of China2012CB417301
NSFEAR-1447107
NSFEAR-1614609
Subject Keywords:Back-projection; Water phases; EGF; Simulation
Record Number:CaltechAUTHORS:20170523-082116647
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170523-082116647
Official Citation:Yue, H., J. C. Castellanos, C. Yu, L. Meng, and Z. Zhan (2017), Localized water reverberation phases and its impact on backprojection images, Geophys. Res. Lett., 44, 9573–9580, doi:10.1002/2017GL073254
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77647
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:06 Jun 2017 22:16
Last Modified:02 Nov 2017 21:28

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