DOI: 10.1016/j.epsl.2021.116842
论文题名: Dynamic rupture of subduction earthquakes located near the trench
作者: Otarola C. ; Ruiz S. ; Herrera C. ; Madariaga R. ; Siegel C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 562 语种: 英语
中文关键词: dynamic inversion
; dynamic source parameters
; source seismic
; subduction earthquakes
英文关键词: Crystallization
; Drops
; Kinematics
; Nucleation
; Dynamic parameters
; Earthquake nucleation
; Hypocentral depth
; Intermediate-depth earthquakes
; Interplate earthquakes
; Source parameters
; Subduction earthquakes
; Subduction interface
; Earthquakes
; earthquake magnitude
; earthquake rupture
; inversion tectonics
; seismic source
; source parameters
; subduction zone
; trench
; tsunami
; Chile
英文摘要: We perform kinematic and dynamic source inversions of four interplate thrust earthquakes that occurred near the trench at the base of the continental wedge in Northern Chile and we compare them to deeper intraplate events. The magnitudes of these interplate events were between Mw 6.3 and Mw 6.5, with hypocentral depths varying between 17.8 km and 28 km. These earthquakes correspond to one foreshock and three aftershocks of the large 2014 Mw 8.2 Iquique earthquake. The geometry of the seismic rupture obtained from the kinematic and dynamic inversions were similar for the four earthquakes studied and their dynamic source parameters are in accordance with typical interplate earthquakes around Mw 6.5. We compare the dynamic rupture of these events with those of five intraplate, intermediate-depth earthquakes that occurred in Northern Chile, Japan, Argentina and Mexico with depths between 57 km and 250 km. We also compare these events with the Mw 6.9 Valparaiso earthquake that was also a shallow interplate thrust event. Results show that the main dynamic parameters of the interplate events (stress in the nucleation zone, overall stress drop and fracture energy rate) were smaller than those of the intraplate intermediate-depth earthquakes. Furthermore, we compare our results with those obtained with several methodologies commonly used to estimate values of stress drop, fault radius and corner frequency. We find some minor differences between them for most of the earthquakes analyzed. Finally, we infer from our results that the studied area, located in the subduction interface zone near the trench, is suitable for earthquake nucleation of small to moderate earthquakes and does not represent a barrier for a future large tsunamigenic rupture. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165622
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile; School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road VictoriaBC V8P 5C2, Canada; Département de Géologie, Ecole Normale Superieure, PSL University, Paris, 75005, France
Recommended Citation:
Otarola C.,Ruiz S.,Herrera C.,et al. Dynamic rupture of subduction earthquakes located near the trench[J]. Earth and Planetary Science Letters,2021-01-01,562