气候变化领域集成服务门户(CCPortal): Spatiotemporal analysis of seismic velocity changes at Okmok volcano, Alaska and implications from deformation source modeling

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DOI	10.1016/j.epsl.2021.116809
	Spatiotemporal analysis of seismic velocity changes at Okmok volcano, Alaska and implications from deformation source modeling
	Bennington N.L.; Ohlendorf S.J.; Thurber C.H.; Haney M.M.
发表日期	2021
ISSN	0012821X
卷号	561
英文摘要	In this study, we use ambient noise interferometry to determine temporal changes in seismic velocity at Okmok volcano, Alaska, during the inter-eruptive period between the 1997 and 2008 eruptions. Specifically, we examine seismic velocity changes between 2005 and 2007. We further calculate seismic velocity changes in the frequency and depth domains. Examination of depth-constrained changes in seismic velocity allow us to distinguish between volcanic and non-volcanic processes occurring at Okmok. We show evidence that the presence of overlying lava flows may result in long term increases in the seismic velocity of the subsurface. Using the software package Coulomb 3.3, complementary theoretical volumetric strain modeling of volcanic deformation at Okmok is also carried out. These strain models are interpreted in tandem with our depth-constrained changes in seismic velocity. This joint analysis technique allows us to determine the location of the volcanic deformation at Okmok during the 1997-2008 inter-eruptive period. The location technique that we develop requires the use of only three seismic stations or station pairs in order to locate the center of volcanic deformation. Thus, this technique is a potentially valuable tool for monitoring the location of active magma storage at sparsely instrumented volcanoes worldwide. © 2021
关键词	ambient noise interferometry strain volcanic deformation
英文关键词	Deformation; Location; Seismic waves; Velocity; Volcanoes; Location techniques; Seismic station; Seismic velocities; Source modeling; Spatiotemporal analysis; Volcanic deformation; Volcanic process; Volumetric strain; Seismology; ambient noise; deformation; interferometry; lava flow; seismic velocity; spatiotemporal analysis; strain analysis; volcanism; Alaska; Aleutian Islands; Fox Islands; Okmok Volcano; Umnak Island; United States
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203031
作者单位	U.S. Geological Survey, Hawaiian Volcano Observatory, Hilo, HI, United States; University of Wisconsin-Madison, Madison, WI, United States; National Tsunami Warning Center, Palmer, AK, United States; U.S. Geological Survey, Alaska Volcano Obsevatory, Anchorage, AK, United States
推荐引用方式 GB/T 7714	Bennington N.L.,Ohlendorf S.J.,Thurber C.H.,et al. Spatiotemporal analysis of seismic velocity changes at Okmok volcano, Alaska and implications from deformation source modeling[J],2021,561.
APA	Bennington N.L.,Ohlendorf S.J.,Thurber C.H.,&Haney M.M..(2021).Spatiotemporal analysis of seismic velocity changes at Okmok volcano, Alaska and implications from deformation source modeling.Earth and Planetary Science Letters,561.
MLA	Bennington N.L.,et al."Spatiotemporal analysis of seismic velocity changes at Okmok volcano, Alaska and implications from deformation source modeling".Earth and Planetary Science Letters 561(2021).