Investigating the reactivation of historical landslides during the 2022 Luding MS6.8 earthquake

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences
Tao Wei, Mingyao Xia, Xinxin Zhang, Shaojian Qi
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Abstract

On September 5, 2022, a strong earthquake with a magnitude of MS6.8 struck Luding County in Sichuan Province, China, triggering thousands of landslides along the Dadu River in the northwest-southeast (NW-SE) direction. We investigated the reactivation characteristics of historical landslides within the epicentral area of the Luding earthquake to identify the initiation mechanism of earthquake-induced landslides. Records of the two newly triggered and historical landslides were analyzed using manual and threshold methods; the spatial distribution of landslides was assessed in relation to topographical and geological factors using remote sensing images. This study sheds light on the spatial distribution patterns of landslides, especially those that occur above historical landslide areas. Our results revealed a similarity in the spatial distribution trends between historical landslides and new ones induced by earthquakes. These landslides tend to be concentrated within a range of 0.2 km from the river and 2 km from the fault. Notably, both rivers and faults predominantly influenced the reactivation of historical landslides. Remarkably, the reactivated landslides are characterized by their small to medium size and are predominantly situated in historical landslide zones. The number of reactivated landslides surpassed that of previously documented historical landslides within the study area. We provide insights into the critical factors responsible for historical landslides during the 2022 Luding earthquake, thereby enhancing our understanding of the potential implications for future co-seismic hazard assessments and mitigation strategies.

调查 2022 年泸定 MS6.8 级地震期间历史滑坡的重新激活情况
2022 年 9 月 5 日,中国四川省泸定县发生 MS6.8 级强烈地震,引发大渡河沿岸西北-东南(NW-SE)方向数千次滑坡。我们调查了泸定地震震中区历史滑坡的再活化特征,以确定地震诱发滑坡的启动机制。我们采用人工和阈值法分析了两处新引发的滑坡和历史滑坡的记录,并利用遥感图像评估了滑坡的空间分布与地形和地质因素的关系。这项研究揭示了滑坡的空间分布模式,尤其是发生在历史滑坡区域上方的滑坡。我们的研究结果表明,历史滑坡与地震引发的新滑坡在空间分布趋势上具有相似性。这些滑坡往往集中在距离河流 0.2 公里和断层 2 公里的范围内。值得注意的是,河流和断层都主要影响历史滑坡的重新激活。值得注意的是,重新激活的滑坡具有中小型滑坡的特点,并且主要位于历史滑坡带。在研究区域内,重新激活的滑坡数量超过了之前记录的历史滑坡数量。我们对 2022 年泸定地震期间造成历史滑坡的关键因素进行了深入研究,从而加深了我们对未来同震灾害评估和减灾战略潜在影响的理解。
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来源期刊
Earthquake Science
Earthquake Science GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.10
自引率
8.30%
发文量
42
审稿时长
3 months
期刊介绍: Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.
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