DOI: 10.1016/j.tecto.2020.228685
论文题名: Three-dimensional numerical simulation of the interseismic and coseismic phases associated with the 6 April 2009, Mw 6.3 L'Aquila earthquake (Central Italy)
作者: Albano M. ; Barba S. ; Bignami C. ; Carminati E. ; Doglioni C. ; Moro M. ; Stramondo S. ; Saroli M.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 798 语种: 英语
中文关键词: Coulomb stress
; Dilatancy
; Gravitational force
; InSAR
; L'Aquila earthquake
; Numerical model
; Tectonic force
英文关键词: 3D modeling
; Faulting
; Geodesy
; Geodynamics
; Numerical models
; Slip forming
; Stick-slip
; 3-D numerical modeling
; Central Apennines
; Hazard Assessment
; L'aquila earthquakes
; Seismic monitoring
; Stress and strain
; Strong earthquakes
; Three-dimensional numerical simulations
; Earthquakes
; computer simulation
; coseismic process
; earthquake event
; earthquake magnitude
; earthquake mechanism
; fault zone
; hazard assessment
; interferometry
; numerical model
; seismic hazard
; seismicity
; strong motion
; synthetic aperture radar
; tectonic setting
; three-dimensional modeling
; Abruzzi
; Apennines
; Italy
; L'Aquila
; Aquila
英文摘要: Although several observations have been reported in the literature before a strong earthquake, their relation with the forthcoming event is often controversial. Since many physical processes and parameters govern the dynamics of preparation, initiation, and occurrence of earthquakes, their understanding is essential for explaining anomalous seismological, geophysical, hydrological and geodetic signals before a strong earthquake that may be considered for seismic monitoring and hazard assessment. In this work, the interseismic and coseismic stress and strain fields associated with the 6 April 2009, Mw 6.3 L'Aquila earthquake are calculated via a 3D numerical model designed to simulate the crustal interseismic loading and the coseismic brittle episodic dislocation along the fault. The model adopts a framework of gravitational and tectonic forces that are compatible with the geodynamics of the Central Apennines region of the Italian territory. The model assumes a brittle upper crust, where the fault has stick-slip behaviour, and a plastic deeper crust, where the fault is in stationary creep. The results indicate that the concurrent action of gravitational and tectonic forces determines steep interseismic stress gradients at the transition between the creeping and locked fault planes that promote the coseismic subsidence of the hanging wall. The interseismic strain above the transition between that locked upper fault and its unlocked lower shear zone develops a dilated volume in the hanging wall and a contracted volume in the footwall. These stress and strain variations are compatible with seismological, geophysical and geodetic anomalies observed before the earthquake, i.e., Vp/Vs anomalies and location of foreshocks. Interseismic stress and strain patterns invert during the coseismic stage. The dilated volume, formed during the interseismic phase, will be contracted at the coseismic stage and, conversely, the footwall volume previously contracted will be expanded. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170766
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna murata 605, Roma, 00143, Italy; Dipartimento di Scienze della Terra, “Sapienza” Università di Roma, Piazzale Aldo Moro 5, Roma, 00185, Italy; Dipartimento di Ingegneria Civile e Meccanica, Università degli Studi di Cassino e del Lazio meridionale, via G. di Biasio 43, Cassino (FR), 03043, Italy
Recommended Citation:
Albano M.,Barba S.,Bignami C.,et al. Three-dimensional numerical simulation of the interseismic and coseismic phases associated with the 6 April 2009, Mw 6.3 L'Aquila earthquake (Central Italy)[J]. Tectonophysics,2021-01-01,798