The Seismic Sequence of the 16 September 2015 Mw 8.3 Illapel, Chile, Earthquake

被引:84
|
作者
Ruiz, Sergio [1 ]
Klein, Emilie [2 ]
del Campo, Francisco [3 ]
Rivera, Efrain [4 ]
Poli, Piero [5 ]
Metois, Marianne [6 ]
Vigny, Christophe [2 ]
Baez, Juan Carlos [3 ]
Vargas, Gabriel [4 ]
Leyton, Felipe [3 ]
Madariaga, Raul [2 ]
Fleitout, Luce [2 ]
机构
[1] Univ Chile, Dept Geofis, Blanco Encalada 2002, Santiago, Chile
[2] Ecole Normale Super, Geol Lab, 24 Rue Lhomond, F-75231 Paris, France
[3] Univ Chile, Ctr Sismol Nacl, Blanco Encalada 2002, Santiago, Chile
[4] Univ Chile, Dept Geol, Plaza Ercilla 803, Santiago, Chile
[5] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[6] Univ Lyon 1, ENS Lyon, CNRS UMR5276, Lab Geol Lyon Terre,Planetes,Environm, F-69622 Villeurbanne, France
基金
美国国家科学基金会;
关键词
MAULE EARTHQUAKE; COASTAL UPLIFT; DEFORMATION; SUBDUCTION; SLIP; REGION; EVENT; PLATE; GPS;
D O I
10.1785/0220150281
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
On 16 September 2015, the M-w 8.3 Illapel, Chile, earthquake broke a large area of the Coquimbo region of north-central Chile. This area was well surveyed by more than 15 high-rate Global Positioning System (GPS) instruments, installed starting in 2004, and by the new national seismological network deployed in Chile. Previous studies had shown that the Coquimbo region near Illapel was coupled to about 60%. After the M-w 8.8 Maule megathrust earthquake of 27 February 2010, we observed a large-scale postseismic deformation, which resulted in a strain rate increase of about 15% in the region of Illapel. This observation agrees with our modeling of viscous relaxation after the Maule earthquake. The area where upper-plate GPS velocity increased coincides very well with the slip distribution of the Illapel earthquake inverted from GPS measurements of coseismic displacement. The mainshock started with a small-amplitude nucleation phase that lasted 20 s. Backprojection of seismograms recorded in North America confirms the extent of the rupture, determined from local observations, and indicates a strong directivity from deeper to shallower rupture areas. The coseismic displacement shows an elliptical slip distribution of about 200 km x 100 km with a localized zone where the rupture is deeper near 31.3 degrees S. This distribution is consistent with the uplift observed in some GPS sites and inferred from field observations of bleached coralline algae in the Illapel coastal area. Most of aftershocks relocated in this study were interplate events, although some of the events deeper than 50 km occurred inside the Nazca plate and had tension (slab-pull) mechanisms. The majority of the aftershocks were located outside the 5 m contour line of the inferred slip distribution of the mainshock.
引用
收藏
页码:789 / 799
页数:11
相关论文
共 50 条
  • [21] Spatial-temporal properties of afterslip associated with the 2015 Mw 8.3 Illapel earthquake, Chile
    Xiang, Yunfei
    Yue, Jianping
    Jiang, Zhongshan
    Xing, Yin
    [J]. EARTH PLANETS AND SPACE, 2021, 73 (01):
  • [22] Remote Sensing of Atmospheric and Ionospheric Signals Prior to the Mw 8.3 Illapel Earthquake, Chile 2015
    Daneshvar, Mohammad Reza Mansouri
    Freund, Friedemann T.
    [J]. PURE AND APPLIED GEOPHYSICS, 2017, 174 (01) : 11 - 45
  • [23] Coseismic radiation and stress drop during the 2015 Mw 8.3 Illapel, Chile megathrust earthquake
    Yin, Jiuxun
    Yang, Hongfeng
    Yao, Huajian
    Weng, Huihui
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2016, 43 (04) : 1520 - 1528
  • [24] Imaging Rupture Process of the 2015 Mw 8.3 Illapel Earthquake Using the US Seismic Array
    Li, Bo
    Ghosh, Abhijit
    [J]. PURE AND APPLIED GEOPHYSICS, 2016, 173 (07) : 2245 - 2255
  • [25] Source model of the 16 September 2015 Illapel, Chile, Mw 8.4 earthquake based on teleseismic and tsunami data
    Heidarzadeh, Mohammad
    Murotani, Satoko
    Satake, Kenji
    Ishibe, Takeo
    Gusman, Aditya Riadi
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2016, 43 (02) : 643 - 650
  • [26] Imaging Rupture Process of the 2015 Mw 8.3 Illapel Earthquake Using the US Seismic Array
    Bo Li
    Abhijit Ghosh
    [J]. Pure and Applied Geophysics, 2016, 173 : 2245 - 2255
  • [27] Slip segmentation and slow rupture to the trench during the 2015, Mw8.3 Illapel, Chile earthquake
    Melgar, Diego
    Fan, Wenyuan
    Riquelme, Sebastian
    Geng, Jianghui
    Liang, Cunren
    Fuentes, Mauricio
    Vargas, Gabriel
    Allen, Richard M.
    Shearer, Peter M.
    Fielding, Eric J.
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2016, 43 (03) : 961 - 966
  • [28] Complex Rupture of the 2015 Mw 8.3 Illapel Earthquake and Prehistoric Events in the Central Chile Tsunami Gap
    Easton, Gabriel
    Gonzalez-Alfaro, Jose
    Villalobos, Angelo
    Alvarez, Gabriel
    Melgar, Diego
    Ruiz, Sergio
    Sepulveda, Bernardo
    Escobar, Manuel
    Leon, Tomas
    Baez, Juan Carlos
    Izquierdo, Tatiana
    Forch, Maximiliano
    Abad, Manuel
    [J]. SEISMOLOGICAL RESEARCH LETTERS, 2022, 93 (03) : 1479 - 1496
  • [29] Fast relocking and afterslip-seismicity evolution following the 2015 Mw 8.3 Illapel earthquake in Chile
    Joaquín Hormazábal
    Marcos Moreno
    Francisco Ortega-Culaciati
    Juan Carlos Báez
    Carlos Peña
    Christian Sippl
    Diego González-Vidal
    Javier Ruiz
    Sabrina Metzger
    Shoichi Yoshioka
    [J]. Scientific Reports, 13 (1)
  • [30] Retrieving real-time co-seismic displacements using GPS/GLONASS: a preliminary report from the September 2015 Mw 8.3 Illapel earthquake in Chile
    Chen, Kejie
    Ge, Maorong
    Babeyko, Andrey
    Li, Xingxing
    Diao, Faqi
    Tu, Rui
    [J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 2016, 206 (02) : 941 - 953