气候变化领域集成服务门户(CCPortal): Seasonal and Coseismic Velocity Variation in the Region of L'Aquila From Single Station Measurements and Implications for Crustal Rheology

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DOI	10.1029/2019JB019316
	Seasonal and Coseismic Velocity Variation in the Region of L'Aquila From Single Station Measurements and Implications for Crustal Rheology
	Poli P.; Marguin V.; Wang Q.; D'Agostino N.; Johnson P.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	We performed measurements of velocity variations for variable coda waves time lapse using empirical Green's functions reconstructed by autocorrelation of seismic noise recorded during a period of 17 years in the region of L'Aquila, Italy. The time lapse approach permitted us to evaluate the spatial (depth) dependence of velocity variation (dv/v). By quantitatively comparing the 17 years of dv/v time series with independent data (e.g., strain induced by earthquakes and hydrological loading), we unravel a group of physical processes inducing velocity variations in the crust over multiple time and spatial scales. We find that rapid shaking due to three magnitude 6+ earthquakes mainly induced near surface velocity variations. On the other hand, slow strain perturbation (period 5 years, in the preseismic period) associated with hydrological cycles, induced velocity changes primarily in the middle crust. The observed behavior suggests the existence of a large volume of fluid-filled cracks exist deep in the crust. Our study highlights the possibility of using seasonal and multiyear perturbations to probe the physical properties of seismogenic fault volumes and shed new light into the depth-dependent rheology of crustal rocks in the region or L'Aquila. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	earthquakes; Italy; seismology; velocity variation
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/187787
作者单位	Institut de Sciences de la Terre, Université Grenoble Alpes, France; Département des sciences de la Terre, Université de Genève, Geneva, Switzerland; Osservatorio Nazionale Terremoti, Istituto Nazionale Geofisica Vulcanologia, Rome, Italy; Geophysics, Los Alamos National Laboratory, Los Alamos, NM, United States
推荐引用方式 GB/T 7714	Poli P.,Marguin V.,Wang Q.,et al. Seasonal and Coseismic Velocity Variation in the Region of L'Aquila From Single Station Measurements and Implications for Crustal Rheology[J],2020,125(7).
APA	Poli P.,Marguin V.,Wang Q.,D'Agostino N.,&Johnson P..(2020).Seasonal and Coseismic Velocity Variation in the Region of L'Aquila From Single Station Measurements and Implications for Crustal Rheology.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Poli P.,et al."Seasonal and Coseismic Velocity Variation in the Region of L'Aquila From Single Station Measurements and Implications for Crustal Rheology".Journal of Geophysical Research: Solid Earth 125.7(2020).