气候变化领域集成服务门户(CCPortal): Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption

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DOI	10.1029/2020GL088447
	Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption
	Moyer P.A.; Boettcher M.S.; Bohnenstiehl D.R.; Abercrombie R.E.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	Variations in stress drops of earthquakes associated with the April and May 2015 eruption of Axial Seamount, on the Juan de Fuca Ridge, suggest a reduction in crustal strength as a result of the eruption. Seismicity during the inflation and deflation periods was well recorded by ocean bottom seismometers located within and along the caldera. We use these nearby recordings and an empirical Green's function spectral ratio method to obtain corner frequencies for stress drops of earthquakes on caldera ring faults. We find stress drops from 0.6 to 43 MPa for 423 ring fault earthquakes (1.6 ≤ MW ≤ 3.6) and an average stress drop two times higher during the inflation period (6.4 MPa) prior to the eruption, than during the subsequent deflation (3.2 MPa). Stress drops also correlate with spatially varying shear wave speed, possibly reflecting a region of pervasive cracking in the northern caldera. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earthquakes; Faulting; Shear flow; Shear waves; Submarine geology; Average stress; Corner frequency; Crustal strength; Empirical green's functions; Ocean bottom seismometer; Shear wave speed; Spectral ratios; Stress drop; Drops; cracking (fracture); damage mechanics; earthquake event; Green function; ocean bottom seismometer; S-wave; seafloor; seamount; seismic data; seismicity; stress; volcanic eruption; Juan de Fuca Ridge; Pacific Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169911
作者单位	Department of Earth Sciences, University of New Hampshire, Durham, NH, United States; Department of Marine, Earth, and Atmospheric Sciences and Center for Geospatial Analytics, North Carolina State University, Raleigh, NC, United States; Department of Earth and Environment, Boston University, Boston, MA, United States
推荐引用方式 GB/T 7714	Moyer P.A.,Boettcher M.S.,Bohnenstiehl D.R.,et al. Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption[J],2020,47(16).
APA	Moyer P.A.,Boettcher M.S.,Bohnenstiehl D.R.,&Abercrombie R.E..(2020).Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption.Geophysical Research Letters,47(16).
MLA	Moyer P.A.,et al."Crustal Strength Variations Inferred From Earthquake Stress Drop at Axial Seamount Surrounding the 2015 Eruption".Geophysical Research Letters 47.16(2020).