globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228706
论文题名:
Seismicity in the upper plate of the Northern Chilean offshore forearc: Evidence of splay fault south of the Mejillones Peninsula
作者: Pastén-Araya F.; Potin B.; Ruiz S.; Zerbst L.; Aden-Antoniów F.; Azúa K.; Rivera E.; Rietbrock A.; Salazar P.; Fuenzalida A.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 800
语种: 英语
中文关键词: 3D Tomography Model ; Aftershocks ; North of Chile ; Offshore Forearc ; Splay Fault
英文关键词: Faulting ; Offshore oil well production ; Structural geology ; Arrival time ; Fault system ; Focal mechanism ; Offshore fault system ; Repeating earthquake ; Rupture plane ; Seismic networks ; Seismotectonics ; Earthquakes ; aftershock ; basin evolution ; earthquake event ; earthquake magnitude ; fault zone ; plate motion ; seismicity ; three-dimensional modeling ; Chile
英文摘要: The region around the Mejillones Peninsula is characterized by major onshore and offshore fault systems. The existence of major splay faults in these fault systems has been debated. To improve our undestanding of seismotectonic processes affecting the MP, we built a new catalog of aftershocks of the 1995 Antofagasta earthquake (Mw 8.1) recorded by the CINCA seismic network. In addition, we build a three-dimensional tomographic model to determine the physical properties of the upper plate using arrival times from our new catalog combined with other earthquakes catalogs derived from several networks deployments across the MP. We detected seismicity in the outer wedge of the upper plate. The seismicity is partially defined by a clear lineament between 22 and 5 km depth that we defined as a splay fault. The focal mechanisms indicate a rupture plane with NE orientation and SE dip. The seismicity in the upper plate and splay fault are located in the areas in which the Vp and Vs velocities are decreased and the Vp/Vs ratio is increased, suggesting a fractured fault zone within the outer wedge of the upper plate. We propose the presence of fluids in the fracture fault zone within the outer wedge because the decrease in Vs larger than that of Vp and repeating earthquakes clusters were detected. Our observations present clear evidence of the activation of the splay fault in the outer wedge of the North Chilean offshore forearc. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170883
Appears in Collections:气候变化与战略

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作者单位: Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile; Geophysical Institute (GPI), Karlsruhe Institute of Technology, Karlsruhe, Germany; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; European-Mediterranean Seismological Centre, c/o CEA, Arpajon, Cedex, 91297, France; Departamento de Ciencias Geológicas, Universidad Católica del Norte, Centro de Investigación para la Gestión Integrada del Riesgo de Desastre (CIGIDEN), Antofagasta, Chile

Recommended Citation:
Pastén-Araya F.,Potin B.,Ruiz S.,et al. Seismicity in the upper plate of the Northern Chilean offshore forearc: Evidence of splay fault south of the Mejillones Peninsula[J]. Tectonophysics,2021-01-01,800
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