Statistical analysis of landslides caused by the Mw 6.9 Yushu, China, earthquake of April 14, 2010

摘要: The April 14, 2010 Yushu, China, earthquake (Mw 6.9) triggered a great number of landslides. At least 2,036 co-seismic landslides, with total coverage area 1.194 km2, were delineated by visual interpretation aerial photographs and satellite images taken following the earthquake, verified field inspection. Based on mapping results, statistical analysis spatial distribution these landslides is performed using landslide percentage (LAP), defined as affected density (LND), per square kilometer. purpose to clarify how correlate control factors, which are elevation, slope angle, aspect, position, distance from drainages, lithology, surface rupture, peak ground acceleration (PGA). results show that both LAP LND have strongly positive correlations angle negative rupture drainages. highest LPD values in places elevations 3,800 4,000 m. slopes producing mostly facing toward NE, E, SE. geological units Q4 al-pl, N, T3 kn 1 concentrations No apparent present between PGA. On sides distributions almost similar except few exceptions, likely associated nature strike-slip seismogenic fault for this event. bivariate shows that, descending order, earthquake-triggered impact factors rupture > slope angle > distance drainages > lithology > PGA. Besides, detailed inventories related earthquakes still compared thrusting-fault earthquakes, case study would shed new light subject. For instance, rather different earthquakes. It reminds us take strategies measures prevention mitigation induced mechanisms.