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- Title
Brief Communication: Landslides triggered by the M<sub>s</sub> = 7.0 Lushan earthquake, China.
- Authors
Chen, X. L.; Yu, L.; Wang, M. M.; Lin, C. X.; Liu, C. G.; Li, J. Y.
- Abstract
Earthquake-triggered landslides have drawn much attention around the world because of the severe hazards they pose. The 20 April 2013 Ms = 7.0 Lushan Earthquake, which occurred in the Long men Shan region in Sichuan province, China, triggered more than 1000 landslides throughout an area of about 2200 km², and completely blocked many roads and exacerbated overall transportation problems in the mountainous terrain. Preliminary landslide inventory is complied immediately following the earthquake, mainly based on the high-resolution remote sensing images. At the same time, the distribution of these landslides is statistically investigated to determine how the occurrence of landslides correlates with distance from the earthquake epicenter, slope steepness, seismic intensity and rock type. Statistic analysis is conducted using landslide point density (LPD), which is defined as the number of landslides per square kilometer. It is found that LPD has a strong positive correlation with slope gradients and a negative-exponential decline with the distance from the epicenter. The higher LPD values occur in younger strata systems like Quaternary and Tertiary sediments in the study area. Spatially, the triggered landslides are controlled by the causative faults and mainly concentrated around the epicenter. All the landslides are located within the area with seismic intensity ≥ VII and in line with seismic intensity. Generally, LPD value decreases with increasing distance from the epicenter, and sometimes landslides are densely distributed along the roads in the mountainous region. Also, this study reveals that the empirical relationship between distance and seismic magnitude is more suitable for estimating the land slide concentration area during the Lushan earthquake compared to other methods.
- Subjects
CHINA; LANDSLIDES; EARTHQUAKES; EARTHQUAKE hazard analysis; EARTHQUAKE intensity; REMOTE sensing
- Publication
Natural Hazards & Earth System Sciences, 2014, Vol 14, Issue 5, p1257
- ISSN
1561-8633
- Publication type
Article
- DOI
10.5194/nhess-14-1257-2014