2018年帕卢<i>M</i><sub>W</sub>7.6地震震源及苏拉威西地区构造应力场特征

崔华伟; 万永革; 王晓山; 黄骥超; 靳志同

doi:10.3799/dqkx.2020.243

Volume 46 Issue 7

Jul. 2021

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Article Navigation > Earth Science > 2021 > 46(7): 2657-2674

Cui Huawei, Wan Yongge, Wang Xiaoshan, Huang Jichao, Jin Zhitong, 2021. Characteristic of Tectonic Stress Field in Source Region of 2018 MW7.6 Palu Earthquake and Sulawesi Area. Earth Science, 46(7): 2657-2674. doi: 10.3799/dqkx.2020.243

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Cui Huawei, Wan Yongge, Wang Xiaoshan, Huang Jichao, Jin Zhitong, 2021. Characteristic of Tectonic Stress Field in Source Region of 2018 M_W7.6 Palu Earthquake and Sulawesi Area. Earth Science, 46(7): 2657-2674. doi: 10.3799/dqkx.2020.243

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Characteristic of Tectonic Stress Field in Source Region of 2018 M_W7.6 Palu Earthquake and Sulawesi Area

doi: 10.3799/dqkx.2020.243

Cui Huawei^{1, 2
,
,},
Wan Yongge^{2, 3
,
,
,},
Wang Xiaoshan⁴,
Huang Jichao^{2, 3},
Jin Zhitong^{2, 3}

1.
Shandong Earthquake Agency, Jinan 250014, China
2.
Hebei Key Laboratory of Earthquake Dynamics, Sanhe 065201, China
3.
Institute of Disaster Prevention, Sanhe 065201, China
4.
Hebei Earthquake Agency, Shijiazhuang 050021, China

Received Date: 2020-08-17
Publish Date: 2021-07-15

Abstract

Abstract

In order to analyse the characteristic of seismogenic structure and tectonic stress field about Palu earthquake. Based on the focal mechanism solution from Global CMT catalog between January 1976 and April 2018, the tectonic stress field is inverted about Palu Indonesia earthquake on September 28th, 2018 and Sulawesi area. The conclusions are obtained as follows: Tectonic stress field are consistency and inhomogeneity in both sides of the boundary 0°. The compressive axis is plunging to north with lower plunge and extensional axis is plunging to south with larger plunge in North area. And South area is compressed in the direction of NNW-EW and extended in the direction of N-S with lower plunge. The tectonic stress field in northern area is a subduction zone, and the stress regime is difference in North Sula Block and Manado Block, because of pushing from Batui Thrust and blocking from Celebes Sea. In the south area, the crustal material is escaped in the direction of NNE-SSW, under compression in the direction of E-W, from Banda Sea and Makasa Basin. Lower R value in central Sulawesi is probably caused by mantle flow upwelling from upper mantle. The tectonic stress field and R value are complicated and heterogeneous in eastern area, which is effected by Sanghie double subduction, Minahassa Trench and active volcano. The tectonic stress field is strike slip regime with a little part of normal in western area, which is beneficial to trigger this earthquake and supershear.
- Palu earthquake,
- Sulawesi area,
- focal mechanism solution,
- tectonic stress field,
- R value,
- earthquake

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References(89)

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Characteristic of Tectonic Stress Field in Source Region of 2018 MW7.6 Palu Earthquake and Sulawesi Area

doi: 10.3799/dqkx.2020.243

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Characteristic of Tectonic Stress Field in Source Region of 2018 M_W7.6 Palu Earthquake and Sulawesi Area