[论文解读] Mountain resonance shapes the distribution of earthquake-induced landslides

Ashok Dahal|arXiv (Cornell University)|Jan 16, 2026

Landslides and related hazards被引用 0

一句话总结

该研究表明山地尺度固有频率会影响地震引发的滑坡发生的位置和规模，以上述2015年格尔卡地震为例，采用山地3D模态分析与滑坡清单。

ABSTRACT

Earthquake-induced landslides are among the most destructive cascading hazards, yet the physical mechanisms governing their spatial distribution and size remain incompletely understood. While amplification of seismic waves by local topography is well documented, the role of mountain-scale resonance has remained largely untested. Here we demonstrate that the resonant frequency of mountains exerts a statistically significant control on the occurrence, spatial pattern, and size of coseismic landslides. Using the 2015 Mw 7.8 Gorkha earthquake in Nepal, which triggered more than 25,000 landslides, we combine three-dimensional modal analysis of 3,130 mountain bodies with a high-resolution landslide inventory. Landslides preferentially occur on mountains whose resonant frequencies (0.5-1.2 Hz) overlap with the dominant frequency content of the earthquake. Mountains affected by landslides exhibit systematically lower resonant frequencies than stable mountains, and larger landslides are associated with lower-frequency mountains. These findings provide quantitative evidence that mountain-scale resonance amplifies seismic ground motion sufficiently to influence landslide triggering, highlighting an overlooked mechanism that should be incorporated into assessments of earthquake-induced landslide hazard.

研究动机与目标

• 推动理解驱动地震诱发滑坡的空间分布与规模的物理机制。
• 检验山地尺度共振是否不仅仅由局部放大效应决定滑坡的触发。
• 利用一次重大的地震案例研究量化山地共振频率与滑坡发生和规模之间的关系。

提出的方法

• 对3,130个山体进行三维模态分析。
• 整理2015年格尔卡地震的高分辨率滑坡清单。
• 将山体的共振频率（0.5–1.2 Hz）与地震的主频含量进行比较。
• 分析受滑坡影响的山体是否在共振特性上与稳定山体不同。

实验结果

研究问题

• RQ1 山地尺度的共振频率是否与同震滑坡的发生及空间分布相关？
• RQ2 较大的滑坡是否与具有特定共振頻率范围的山体相关？
• RQ3 山地共振放大是否能解释对滑坡触发有贡献的地表运动的差异？

主要发现

• 滑坡更偏好发生在与地震主频内容重叠的山体上。
• 受滑坡影响的山体其共振频率系统性低于稳定山体。
• 较大的滑坡与低频率山体相关。
• 结果提供定量证据，表明山地尺度共振放大与滑坡触发相关的地震地表运动。