Sun Jingjing, Shao Xiaoyi, Feng Liye, Xu Chong, Huang Yuandong, Yang Wentao
School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China.
National Institute of Natural Hazards, Ministry of Emergency Management of China, 100085, Beijing, China.
Heliyon. 2024 Jan 20;10(2):e24787. doi: 10.1016/j.heliyon.2024.e24787. eCollection 2024 Jan 30.
On August 8, 2017, a magnitude Mw6.5 (Ms7.0) earthquake occurred in Jiuzhaigou County, Aba Prefecture, in the northern part of Sichuan Province, China, with a focal depth of 20 km and an epicenter located at (33.2°N, 103.8°E). Due to the significant magnitude of the earthquake, a large number of coseismic landslides were triggered. Despite previous research conducted by experts on the landslides caused by the Jiuzhaigou earthquake, the actual number of landslides has been severely underestimated in the previously published papers. Through field surveys and visual interpretation of high-resolution remote sensing images before and after the mainshock, we have established a detailed inventory of earthquake-induced landslides. The results indicate that the event caused a minimum of 9428 landslides covering a total area of 18.82 km. These landslides are mainly distributed in the IX intensity area of the earthquake. The landslides mainly consist of medium-sized landslides and debris flows. They predominantly occur in areas with an altitude ranging from 2600 m to 3600 m, with slopes greater than 30° and facing east and southeast. The Lower Carboniferous and Middle Carboniferous formations are more prone to triggering landslides, and landslides are more concentrated within 1 km of roads and in forested areas. Additionally, as the distance from roads and the epicenter increases, the values of LAP and LND decrease, indicating a positive correlation between the two. There are more landslides within 2 km from the fault and within a range of 6 km-9 km from the epicenter. In conclusion, this study provides a comprehensive landslide inventory with broader coverage and increased accuracy. It also conducts a comprehensive analysis of the spatial distribution patterns of landslides. This contributes to a deeper understanding of the causes of coseismic landslides and further research on the impact of landslides in affected areas.
2017年8月8日，中国四川省北部阿坝州九寨沟县发生Mw6.5级（Ms7.0级）地震，震源深度20千米，震中位于（北纬33.2°，东经103.8°）。由于地震震级较大，引发了大量同震滑坡。尽管此前专家对九寨沟地震引发的滑坡进行了研究，但以往发表的论文中对滑坡的实际数量严重低估。通过主震前后的实地调查和高分辨率遥感影像目视解译，我们建立了详细的地震诱发滑坡清单。结果表明，此次地震至少造成9428处滑坡，总面积达18.82平方千米。这些滑坡主要分布在地震Ⅸ度区。滑坡主要由中型滑坡和泥石流组成。它们主要发生在海拔2600米至3600米、坡度大于30°且朝向东和东南的区域。下石炭统和中石炭统地层更容易引发滑坡，滑坡在道路1千米范围内和森林区域更为集中。此外，随着与道路和震中距离的增加，LAP和LND值减小，表明二者呈正相关。在距断层2千米范围内以及距震中6千米至9千米范围内滑坡更多。总之，本研究提供了覆盖范围更广、精度更高的全面滑坡清单。还对滑坡的空间分布模式进行了综合分析。这有助于更深入地了解同震滑坡的成因，并进一步研究滑坡对受灾地区的影响。
