气候变化领域集成服务门户(CCPortal): Globally Scattered 2011 Tohoku Tsunami Waves From a Seafloor Sensor Array in the Northeast Pacific Ocean

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DOI	10.1029/2020JB020221
	Globally Scattered 2011 Tohoku Tsunami Waves From a Seafloor Sensor Array in the Northeast Pacific Ocean
	Kohler M.D.; Bowden D.C.; Ampuero J.-P.; Shi J.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	Modeling of tsunami wave propagation for forecasting focuses on the arrival time and amplitude of the earliest tsunami waves reaching coastlines. The complex later tsunami wavefield, in which scattering is predominant, poses additional hazards due to possible constructive interference of coherent packets of wave energy. However, almost no data sets exist to characterize the geographical sources and temporal evolution of the scattered waves. Here we show how recordings of the 2011 Tohoku tsunami by an array of pressure gauge sensors in the northeastern Pacific Ocean reveal coherent waves that are produced by scattering from distant coastlines including South America and Antarctica, as well as multiple seafloor fracture zones, ridges, and island chains. Multiple signal classification analysis and backward propagation ray tracing provide tight constraints on the origin of each scattered phase and resolve simultaneous wave arrivals from different scatterers. Incoming waves from constant back azimuths occur over time durations of several hours, revealing the time persistence of specific geographical scatterers. The results can advance numerical predictions of tsunami wave impact because they provide direct evidence for the necessity of incorporating both local and distant bathymetry over a range of length scales and for long time durations, to account for the azimuthal dependence of scatterer strength. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	2011 Tohoku earthquake; backprojection; beamforming; pressure gauge array; scattering; tsunami
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/187489
作者单位	Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA, United States; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States; Now at Institute of Geophysics, ETH Zürich, Zürich, Switzerland; Now at Université Côte d'’Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Géoazur, France
推荐引用方式 GB/T 7714	Kohler M.D.,Bowden D.C.,Ampuero J.-P.,et al. Globally Scattered 2011 Tohoku Tsunami Waves From a Seafloor Sensor Array in the Northeast Pacific Ocean[J],2020,125(11).
APA	Kohler M.D.,Bowden D.C.,Ampuero J.-P.,&Shi J..(2020).Globally Scattered 2011 Tohoku Tsunami Waves From a Seafloor Sensor Array in the Northeast Pacific Ocean.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Kohler M.D.,et al."Globally Scattered 2011 Tohoku Tsunami Waves From a Seafloor Sensor Array in the Northeast Pacific Ocean".Journal of Geophysical Research: Solid Earth 125.11(2020).