Monitoring and Assessment for the Susceptibility of Landslide Changes After the 2017 Ms 7.0 Jiuzhaigou Earthquake Using the Remote Sensing Technology

A net increase of 1.2 km² in landslide area was observed at Jiuzhaigou Valley up to September 2019 following the 2017 Ms 7.0 earthquake. This expansion, driven by coseismic and post-seismic landslides along with vegetation degradation, is primarily linked to debris flows triggered by torrential rainfall. Remote sensing technology, including Support Vector Machine classification and Geographic Information System analysis, revealed that susceptibility to post-seismic landslides is influenced by slope, altitude, aspect, peak ground acceleration, fault lines, and strata, with higher susceptibility paradoxically found in areas with lower initial coseismic landslide density. The study highlights the need for proactive monitoring of unstable slopes to mitigate potential landslides, offering a model for assessing seismic-induced geological risks in mountainous regions.

Guo, X., Fu, B., Du, J., Shi, P., Li, J., Li, Z., Du, J., Chen, Q., & Fu, H. (2021). Monitoring and Assessment for the Susceptibility of Landslide Changes After the 2017 Ms 7.0 Jiuzhaigou Earthquake Using the Remote Sensing Technology. Frontiers in Earth Science, 9. https://doi.org/10.3389/feart.2021.633117