Landslides Triggered by the 2020 Qiaojia <i>M</i><sub>w</sub>5.1 Earthquake, Yunnan, China: Distribution, Influence Factors and Tectonic Significance

Xiangli He; Chong Xu; Wenwen Qi; Yuandong Huang; Jia Cheng; Xiwei Xu; Qi Yao; Yongkun Lu; Boyang Dai

doi:10.1007/s12583-021-1492-1

Volume 32 Issue 5

Oct 2021

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Journal of Earth Science > 2021 > 32(5): 1056-1068.

Xiangli He, Chong Xu, Wenwen Qi, Yuandong Huang, Jia Cheng, Xiwei Xu, Qi Yao, Yongkun Lu, Boyang Dai. Landslides Triggered by the 2020 Qiaojia Mw5.1 Earthquake, Yunnan, China: Distribution, Influence Factors and Tectonic Significance. Journal of Earth Science, 2021, 32(5): 1056-1068. doi: 10.1007/s12583-021-1492-1

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Xiangli He, Chong Xu, Wenwen Qi, Yuandong Huang, Jia Cheng, Xiwei Xu, Qi Yao, Yongkun Lu, Boyang Dai. Landslides Triggered by the 2020 Qiaojia M_w5.1 Earthquake, Yunnan, China: Distribution, Influence Factors and Tectonic Significance. Journal of Earth Science, 2021, 32(5): 1056-1068. doi: 10.1007/s12583-021-1492-1

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Landslides Triggered by the 2020 Qiaojia M_w5.1 Earthquake, Yunnan, China: Distribution, Influence Factors and Tectonic Significance

doi: 10.1007/s12583-021-1492-1

Xiangli He^{1, 2
,},
Chong Xu^{1, 2
,
,
,},
Wenwen Qi^{1, 2},
Yuandong Huang³,
Jia Cheng¹,
Xiwei Xu¹,
Qi Yao⁴,
Yongkun Lu⁵,
Boyang Dai⁵

1.
National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
2.
Key Laboratory of Compound and Chained Natural Hazards Dynamics (Under Construction), Ministry of Emergency Management of China, Beijing 100085, China
3.
China University of Geosciences, Beijing 100083, China
4.
China Earthquake Networks Center, Beijing 100045, China
5.
Yunnan Earthquake Agency, Kunming 650224, China

More Information

Corresponding author: Chong Xu: xc11111111@126.com
Received Date: 09 Mar 2021
Accepted Date: 03 Jun 2021
Publish Date: 01 Oct 2021

Abstract

Abstract

On May 18, 2020, an M_w5.1 earthquake occurred in Qiaojia County, Yunnan Province, China. This moderate-sized event triggered massive coseismic landslides, resulting in some damage. In this work, through visual interpretation of high-resolution (0.8-2 m) Gaofen satellite images before and after the earthquake, 167 landslides were delineated, 18 of which were inspected in the field. Using the landslide number density (LND) and landslide area percentage (LAP), we characterized the spatial distribution of these landslides, and analyzed their possible influence factors and tectonic significance. The results show that these landslides are distributed mostly in the NW-SE direction, roughly parallel to the long axis of seismic intensity zones and the strike of the Xiaohe-Baogunao fault (XBF). The LND and LAP decrease with increasing distances to the fault and from the epicenter to fault ends of the XBF. These permit to suggest that the seismogenic fault of the Qiaojia earthquake is likely a hidden branch of the XBF. All of the landslides induced by this event occurred in the region with the seismic intensity of six degrees or greater of the 2014 M_w6.2 Ludian earthquake. Therefore, it was inferred that the 2020 Qiaojia earthquake was probably the subsequent release of accumulated elastic strain after the 2014 Ludian earthquake in a same tectonic stress regime.
- Qiaojia earthquake,
- landslide inventory,
- spatial distribution,
- seismogenic fault,
- Ludian earthquake

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