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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 . ISSN 0094-8276. (In Press)

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Coherent radiators imaged by back-projections (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 re-examine 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 back-projected as coherent radiators near the trench. S wave BP doesn't image energy radiation near the trench. We interpret those coda waves as localized water reverberation phases excited near the trench. We perform a 2D 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.

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Additional Information:© 2017 American Geophysical Union. Accepted manuscript online: 22 May 2017; Manuscript Accepted: 17 May 2017; Manuscript Revised: 15 May 2017; Manuscript Received: 25 February 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 & 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, National Science Foundation of U.S. grant 1447107, ear1614609.
Group:Seismological Laboratory
Funding AgencyGrant Number
National Basic Research Program of China2012CB417301
Subject Keywords:Back-projection; Water phases; EGF; Simulation
Record Number:CaltechAUTHORS:20170523-082116647
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Official Citation:Yue, H., J. C. Castellanos, C. Yu, L. Meng, and Z. Zhan (2017), Localized water reverberation phases and its impact on back-projection images, Geophys. Res. Lett., 44, doi:10.1002/2017GL073254
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77647
Deposited By: Tony Diaz
Deposited On:06 Jun 2017 22:16
Last Modified:06 Jun 2017 22:16

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