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Zusammenfassung:
Numerous potential landslides with slow sliding speeds pose a continuous threat to human safety. The movements of these landslides continuously modify hydrogeological conditions and lead to cracks expansion, making it easier for subsequent rainfall to infiltrate into the landslide interior. Monitoring the tiny variations of structures and pore-water pressure in the interior of landslides can help understanding this coupling mechanism and accessing landslide damage risk. Here, we utilized seismic ambient noise interferometry to assess hourly velocity changes that enable us to quantify the response of landslides to external factors at different depths, including earthquakes, rainfall, and mechanical effects from sliding. In a case of Xishan Village Landslide, Sichuan Province, China, we observed an outstanding velocity drop coinciding with the onset of rainfall and bursts in tremor activity in a period in which the landslide experienced vertical displacement. Our observations highlight the new sight to investigate how the mechanical process of landslide movement modifies hydrogeological conditions and promotes rainfall infiltration, as well as assesses the subsequent recovery process.
