Geodetic Observations of the 2018 Mw 7.5 Sulawesi Earthquake and Its Implications for the Kinematics of the Palu Fault

Geodetic Observations of the 2018 Mw 7.5 Sulawesi Earthquake and Its Implications for the Kinematics of the Palu Fault
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2018年苏拉威西7.5级地震的大地测量及其对帕鲁断层运动学的影响

DOI:
10.1029/2019gl082045
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发表时间:
2019-04
影响因子:
5.2
通讯作者:
Qu Chunyan
Qu Chunyan
中科院分区:
地球科学1区
文献类型:
--
作者:
Song Xiaogang;Zhang Yingfeng;Shan Xinjian;Liu Yunhua;Gong Wenyu;Qu Chunyan

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使用上升和下降干涉合成孔径雷达数据来研究2018年印度尼西亚苏拉威西7.5级地震的断层破裂和滑动模型。最佳拟合滑动模型表明,这次地震不仅破裂了帕卢断裂向北延伸的一段,而且破裂了西北部近海段。向岸断层上的滑动以左旋走滑为主。离岸断层的滑动以正断层为主,最大滑动量约为6.3 m。新发现的近海正断层很可能是震后海啸的成因。结合以往的地貌、构造、大地测量和模型研究,我们认为帕卢断裂的运动学自北向南保持了相同的断裂样式,这是由于深部东倾断裂发生斜向伸展的结果。苏拉威西西北部的变形模式是由这种滑动机制。
The ascending and descending interferometric synthetic aperture radar data are used to investigate the fault rupture and slip model of the 2018 Mw 7.5 Sulawesi, Indonesia, earthquake. The best fitting slip model indicates that this earthquake ruptured not only a segment extending the Palu fault to the north but also a northwestern segment offshore. The slip on the onshore fault is predominant left‐lateral strike slip. The slip on the offshore fault is dominated by normal faulting with a maximum slip of ~6.3 m. The newly discovered offshore normal faulting is likely to be the cause of the tsunami after the shock. Combined with previous geomorphic, tectonic, geodetic, and modeling studies, we suggest that the kinematics of the Palu fault maintained the same style of faulting from north to south, which resulted from an oblique extension occurred on an east dipping fault at depths. The deformation pattern of NW Sulawesi is dominated by this slip mechanism.
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