Abstract
Around 11:50 AM on February 8, 2025, Beijing time, a sudden landslide occurred at Gaojiaping, Jinping Village, Mu'ai Town, Junlian County, Yibin City, Sichuan Province, resulting in severe casualties and property damage. To investigate the kinematic process of the landslide, seismic records generated by the event were analyzed. The seismic signals triggered by this landslide were clearly recorded by five nearby seismic stations with a slight delay relative to the landslide occurrence time. Each station detected two distinct anomalous event signals that were clearly differentiated from background noise, with a total duration of 99 s and frequency distribution ranging from 0.1 Hz to 10.0 Hz. Through detailed analysis combining the landslide's geological environment and topographic relief characteristics along its movement path, the following conclusions were obtained: (1) Based on the characteristics of the landslide signals and the distribution of seismic stations, it was determined that two main sliding processes occurred during this landslide, with their respective initiation times and durations identified. (2) Based on the formation mechanisms of long- and short-period landslide signals, combined with the signal characteristics across different frequency bands and topographic constraints for this landslide, the first main sliding process was subdivided into four stages, while the second main sliding process was broadly divided into three stages. This study provides a scientific reference for deeply understanding the disaster-causing process of the Gaojiaping landslide in Junlian County and enhancing subsequent landslide disaster prevention.
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Title: The Analysis of the Landslide Movement Process in Junlian County, Yibin City, Sichuan Province on February 8, 2025, Based on Seismic Records
Authors: PU Feng¹, XU Qiang¹, PU Chuanhao¹, DONG Xiujun¹, SU Jinrong², GUO Pengyu¹, DENG Bo¹, LI Zhigang¹
Affiliations:
¹ State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
² Earthquake Administration of Sichuan Province, Chengdu 610041, China
Abstract
At approximately 11:50 AM Beijing Time on February 8, 2025, a catastrophic landslide struck Gaojiaping in Jinping Village, Mu'ai Town, Junlian County, Yibin City, Sichuan Province, causing severe casualties and property damage. To investigate the kinematic process of this landslide, we analyzed its seismic records. The resulting signals were clearly captured by five nearby seismic stations with a slight delay relative to the actual event. Each station recorded two distinct anomalous events, clearly distinguishable from background noise, with a combined duration of 99 seconds and a frequency distribution of 0.1–10.0 Hz. Through detailed analysis integrating signal characteristics, station distribution, geological setting, and topographic features along the transport path, we conclude: (1) The landslide involved two main sliding phases, whose initiation times and durations were determined from signal characteristics and station geometry. (2) By leveraging the formation mechanisms of long- and short-period signals together with frequency-dependent features and topographic constraints, we subdivided the first sliding phase into four stages and the second into three stages. This research provides a scientific basis for understanding the disaster mechanism of the Gaojiaping landslide and improving future landslide hazard mitigation.
Keywords: Gaojiaping landslide in Junlian County; seismic network; signal characteristics; kinematic process analysis