Seismic network detects landslides on broad area scale
From 1999 to 2006, Taiwan's Chenyoulan watershed experienced 48,000 landslides, rock avalanches, and other geomorphic events, the bulk of which are thought to be triggered by the powerful tropical cyclones that batter the island each summer. Rock slides and other geomorphic events are a natural hazard, but they're also the source for some of the raw sediment that ends up winding its way downstream, affecting watershed erosion and sedimentation dynamics. From both of these perspectives, having a handle on when and where these geomorphic events occur is important. However, the main method used to track landslides—optical satellite observations—has a low temporal resolution, has trouble discerning new activity at previously affected sites, and struggles to see through clouds or dense canopy cover. Using 14 seismic sensors installed from July to September 2010, Burtin et al. studied the skill of their network in detecting geomorphic activity in the Chenyoulan watershed.