Conjugate ruptures and seismotectonic implications of the 2019 Mindanao earthquake sequence inferred from Sentinel-1 InSAR data
Conjugate ruptures and seismotectonic implications of the 2019 Mindanao earthquake sequence inferred from Sentinel-1 InSAR data
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根据 Sentinel-1 InSAR 数据推断的 2019 年棉兰老岛地震序列的共轭破裂和地震构造意义
DOI：
10.1016/j.jag.2020.102127
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发表时间：
2020-08
影响因子：
7.5
通讯作者：
Wenhao Shen
中科院分区：
文献类型：
--
作者：
Bingquan Li;Yongsheng Li;Wenliang Jiang;Zhe Su;Wenhao Shen
2019年，菲律宾棉兰老岛连续发生4次Mw>6.4级强震。根据USGS和PHIVOLCS的报告，这些地震以走滑破裂为主。这些地震在时间和空间上是否相关仍然未知。我们使用 InSAR 技术和 Sentinel-1 SAR 数据来表征地震序列期间的同震位移场。 InSAR 变形测量令人信服地揭示了四次地震产生了不同的同震位移模式。我们用两步反演策略估计了地震的震源参数。最优模型表明，地震序列是由共轭断层结构的重新激活引起的，该断层结构涉及两个近垂直的左旋走滑断层和两个高角度的右旋走滑断层。我们计算了地震序列中的库仑应力变化，表明之前的强震对后续事件具有显着的应力鼓励作用。基于GPS分析的区域速度表明，这种共轭结构的形成主要是由于俯冲的菲律宾海板块向西运动所致。该地震序列为后续强震提供了地震构造背景，有助于更好地理解共轭构造破裂的形成机制和地震构造意义。
In 2019, four strong earthquakes of Mw>6.4 occurred successively in Mindanao, Philippines. Based on the reports from the USGS and PHIVOLCS, these earthquakes were dominated by strike-slip ruptures. Whether these earthquakes are temporally and spatially related remained unknown. We characterized the coseismic displacement fields during the earthquake sequence using an InSAR technique with Sentinel-1 SAR data. The InSAR deformation measurements convincingly reveal that the four earthquakes produced distinct coseismic displacement patterns. We estimated the source parameters of the earthquakes with a two-step inversion strategy. The optimal model suggests that the earthquake sequence resulted from the reactivation of a conjugate fault structure that involves two nearly vertical left-lateral strike-slip faults and two high-angle right-lateral strike-slip faults. We calculated Coulomb stress changes from the earthquake sequence, suggesting that the previous strong earthquakes had significant stress-encouraging effects on the following events. The regional velocities based on the GPS analysis suggest that the formation of this conjugate structure is mainly due to the westward movement of the subducting Philippine Sea Plate. This earthquake sequence provides a seismotectonic background for subsequent strong earthquakes and helps to better understand the formation mechanisms and seismotectonic implications of conjugate structure rupturing.
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DOI：
10.1109/igarss.2018.8517504
发表时间：
2018-07
期刊：
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium
影响因子：
--
作者：
P. Rosen;E. Gurrola;P. Agram;Joshua Cohen;M. Lavalle;B. Riel;H. Fattahi;M. Aivazis;M. Simons;S. Buckley
通讯作者：
P. Rosen;E. Gurrola;P. Agram;Joshua Cohen;M. Lavalle;B. Riel;H. Fattahi;M. Aivazis;M. Simons;S. Buckley
影响因子：
3.3
作者：
Kang Wang;R. Bürgmann
通讯作者：
Kang Wang;R. Bürgmann
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
DOI：
10.3133/ofr20101083m
发表时间：
2013
期刊：
--
影响因子：
--
作者：
G. Smoczyk;G. Hayes;M. Hamburger;H. Benz;A. Villaseñor;K. Furlong
通讯作者：
G. Smoczyk;G. Hayes;M. Hamburger;H. Benz;A. Villaseñor;K. Furlong
影响因子：
--
作者：
S. Toda;R. Stein;P. Reasenberg;J. Dieterich;A. Yoshida
通讯作者：
S. Toda;R. Stein;P. Reasenberg;J. Dieterich;A. Yoshida