气候变化领域集成服务门户(CCPortal): Near-Field Modeling of the 1964 Alaska Tsunami: The Role of Splay Faults and Horizontal Displacements

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DOI	10.1029/2020JB019620
	Near-Field Modeling of the 1964 Alaska Tsunami: The Role of Splay Faults and Horizontal Displacements
	Suleimani E.; Freymueller J.T.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Near-field observations of tsunami waves generated by the Mw9.2 1964 Alaska earthquake reveal a complex relationship between coseismic slip and the tsunami wavefield in the source area. The documented times and amplitudes of first arrivals, measured run-up heights and inundation areas along the coasts of the Kenai Peninsula and Kodiak Island show that secondary splay faults played an important role in generating destructive tsunami waves. We find that a splay fault extending to about 150°W is required to fit tsunami first arrivals on the Kenai Peninsula but that the splay fault did not rupture along the entire length of the Kenai Peninsula. This extent supports the connection of splay faulting to a persistent Prince William Sound asperity. Our results also show that the contribution of coseismic horizontal displacements into the initial tsunami wavefield does not change the pattern of tsunami arrivals much but increases the amplitude. The coseismic deformation model of Suito and Freymueller (2009, https://doi.org/10.1029/2008JB005954) explains the pattern of tsunami arrivals in the Kodiak Island region well, indicating that it provides a good estimate of slip on the megathrust in the Kodiak asperity. The sensitivity of the near-field arrival information to the coseismic slip model shows that such data are important in distinguishing between slip on splay faults and on the megathrust and in discriminating between competing slip models. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	1964 Great Alaska earthquake; coseismic slip; horizontal displacements; near-field tsunami; splay fault
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/187763
作者单位	Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Now at Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States
推荐引用方式 GB/T 7714	Suleimani E.,Freymueller J.T.. Near-Field Modeling of the 1964 Alaska Tsunami: The Role of Splay Faults and Horizontal Displacements[J],2020,125(7).
APA	Suleimani E.,&Freymueller J.T..(2020).Near-Field Modeling of the 1964 Alaska Tsunami: The Role of Splay Faults and Horizontal Displacements.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Suleimani E.,et al."Near-Field Modeling of the 1964 Alaska Tsunami: The Role of Splay Faults and Horizontal Displacements".Journal of Geophysical Research: Solid Earth 125.7(2020).