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| Titel |
Brief Communication: Landslides triggered by the Ms = 7.0 Lushan earthquake, China |
| VerfasserIn |
X. L. Chen, L. Yu, M. M. Wang, C. X. Lin, C. G. Liu, J. Y. Li |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 5 ; Nr. 14, no. 5 (2014-05-23), S.1257-1267 |
| Datensatznummer |
250118446
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| Publikation (Nr.) |
 copernicus.org/nhess-14-1257-2014.pdf |
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| Zusammenfassung |
| 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 Longmen
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 landslide concentration area during the Lushan earthquake
compared to other methods. |
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