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What are the characteristics of the distribution of earthquake-induced landslides?

As the earthquake-induced landslides tend to be distributed in specific regions, it indicates that the occurrence thereof is not only related to the earthquake mechanism, but also restricted by the slope terrain and geological environment.

In general, scholars believe that earthquake-induced landslides are distributed mostly along earthquake faults: If the earthquake magnitude and intensity scale are more than 5 and 3 respectively, an earthquake-induced landslide can possibly be triggered. For earthquakes whose intensity scale is bigger, they tend to have clearer landslide distribution instead of having an obvious relationship with its distance to epicenter. As for landslides triggered by Chi-Chi Earthquake, there is a dense distribution of landslides with a high earthquake acceleration nearby the fault and, when the earthquake acceleration decreases, the number of landslide sites also reduced accordingly.

Japanese scholars believe that earthquake-induced landslides tend to be a small-scale landslide occurred on a steep slope. As straight and ridge slopes tend to be less earthquake-resistant, the collapses often occur on top of convex slope, where bare rock wall or unstable rocks tend to fall off easily.

For more information, please go to the “Taiwan Geoscience Portal” website.