气候变化领域集成服务门户(CCPortal): Absolute Centroid Location of Submarine Earthquakes from 3D Waveform Modeling of Water Reverberations

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DOI	10.1029/2019JB018941
	Absolute Centroid Location of Submarine Earthquakes from 3D Waveform Modeling of Water Reverberations
	Castellanos J.C.; Zhan Z.; Wu W.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Oceanic transform faults (OTFs) represent an attractive tectonic environment to investigate how slip is accommodated within the crust. However, as most of these fault systems grow in the deep ocean, where few local seismic observations are available, characterizing their earthquake behavior is complicated and remains a formidable challenge. Here we present a novel approach for retrieving precise centroid locations of submarine earthquakes that is based on the modeling of water phases in teleseismic records. Using a hybrid method for simulating far-field body waves with 3D source-side structures, we demonstrate that the scattered energy generated by the continuous bounces of an earthquake's P-wave trapped in the ocean is modelable and carries information about its source location. As a case study, we use a realistic bathymetry model of the Gofar transform fault on the East Pacific Rise and simulate the seismic wavefield at US Array stations for four of its moderate-sized (Mw5.0+) earthquakes. Our modeling results show that water phases are sensitive to a ∼5 km change in the earthquake's horizontal location and that a remarkable agreement between observed and synthetic water phases is achieved when the location of an event is close to its true one. We then relocate three of these events by systematically computing their water phases in candidate locations until a satisfactory waveform fit is achieved. This analysis technique paves a new route for studying earthquake source properties in isolated marine environments and serves as a mean to investigate the seismic behavior of OTFs on a global scale. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Oceanic transform fault; Water phases; Waveform modeling
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187861
作者单位	Seismological Laboratory, Department of Earth and Planetary Sciences, Caltech, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Castellanos J.C.,Zhan Z.,Wu W.. Absolute Centroid Location of Submarine Earthquakes from 3D Waveform Modeling of Water Reverberations[J],2020,125(5).
APA	Castellanos J.C.,Zhan Z.,&Wu W..(2020).Absolute Centroid Location of Submarine Earthquakes from 3D Waveform Modeling of Water Reverberations.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Castellanos J.C.,et al."Absolute Centroid Location of Submarine Earthquakes from 3D Waveform Modeling of Water Reverberations".Journal of Geophysical Research: Solid Earth 125.5(2020).