Relation Between Oceanic Plate Structure, Patterns of Interplate Locking and Microseismicity in the 1922 Atacama Seismic Gap

被引：6

作者：

Gonzalez-Vidal, Diego ^{[1
]}

Moreno, Marcos ^{[2
]}

Sippl, Christian ^{[3
]}

Baez, Juan Carlos ^{[4
]}

Ortega-Culaciati, Francisco ^{[5
]}

Lange, Dietrich ^{[6
]}

Tilmann, Frederik ^{[7
,8
]}

Socquet, Anne ^{[9
]}

Bolte, Jan ^{[10
]}

Hormazabal, Joaquin ^{[5
]}

Langlais, Mickael ^{[9
]}

Morales-Yanez, Catalina ^{[11
]}

Melnick, Daniel ^{[1
]}

Benavente, Roberto ^{[11
,12
]}

Muenchmeyer, Jannes ^{[9
]}

Araya, Rodolfo ^{[13
,14
]}

Heit, Benjamin ^{[7
]}

机构：

[1] Univ Concepcion, Fac Ciencias Fis & Matemat, Dept Geofis, Concepcion, Chile

[2] Pontificia Univ Catolica Chile, Dept Engn & Geotecton, Santiago, Chile

[3] Czech Acad Sci, Inst Geophys, Prague, Czech Republic

[4] Univ Chile, Fac Phys & Math Sci, Natl Seismol Ctr, Santiago, Chile

[5] Univ Chile, Fac Phys & Math Sci, Dept Geophys, Santiago, Chile

[6] GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany

[7] Deutsch GeoForschungsZentrum GFZ, Wissenschaftpk Albert Einstein, Dept Geophys, Potsdam, Germany

[8] Free Univ Berlin, Inst Geol Sci, Berlin, Germany

[9] Univ Grenoble Alpes, Univ Gustave Eiffel, Univ Savoie Mt Blanc, ISTerre,CNRS,IRD, Grenoble, France

[10] Univ Kiel, Dept Math, Kiel, Germany

[11] Univ Catolica Santisima Concepcion, Dept Civil Engn, Concepcion, Chile

[12] Natl Res Ctr Integrated Nat Disaster Management CI, Santiago, Chile

[13] Univ Concepcion, Dept Ingn Matemat, Concepcion, Chile

[14] Univ Concepcion, CI2MA, Concepcion, Chile

来源：

GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 15期

基金：

欧洲研究理事会;

关键词：

Atacama 1922 seismic gap; Chile; GNSS; interplate locking; locking degree; seismic catalog; SLOW SLIP EVENT; SUBDUCTION ZONE; ILLAPEL EARTHQUAKE; CENTRAL CHILE; MODELS; FAULT; TOMOGRAPHY; NORTH; GPS;

D O I：

10.1029/2023GL103565

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We deployed a dense geodetic and seismological network in the Atacama seismic gap in Chile. We derive a microseismicity catalog of >30,000 events, time series from 70 GNSS stations, and utilize a transdimensional Bayesian inversion to estimate interplate locking. We identify two highly locked regions of different sizes whose geometries appear to control seismicity patterns. Interface seismicity concentrates beneath the coastline, just downdip of the highest locking. A region with lower locking (27.5 & DEG;S-27.7 & DEG;S) coincides with higher seismicity levels, a high number of repeating earthquakes and events extending toward the trench. This area is situated where the Copiapo Ridge is subducted and has shown previous indications of both seismic and aseismic slip, including an earthquake sequence in 2020. While these findings suggest that the structure of the downgoing oceanic plate prescribes patterns of interplate locking and seismicity, we note that the Taltal Ridge further north lacks a similar signature.

引用

页数：11