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Landslides

, Volume 12, Issue 6, pp 1159–1168 | Cite as

Distribution pattern of coseismic landslides triggered by the 2014 Ludian, Yunnan, China Mw6.1 earthquake: special controlling conditions of local topography

  • Chen XiaoliEmail author
  • Zhou Qing
  • Liu Chunguo
Recent Landslides

Abstract

The distribution of coseismic landslides triggered by the 2014 Ludian, Yunnan, China Mw6.1 earthquake exhibits a particular pattern. They do not concentrate linearly along a fault (e.g., the causative fault) or a tectonic zone, instead mostly appear in the southeast and west of the epicenter of the main shock in a relatively clustering manner, 5–9 km distant. Majority of them occur at the river reaches with cliffs, including the unusually large-scale landslide at the Hongshiyan village, north bank of the Njiulanjiang River. Such a phenomenon implies that local conditions of terrain of the river valley might control the distribution of coseismic landslides induced by the Ludian event, which is of a moderate magnitude. To verify quantitatively this intuitive conjecture, this study proposes a parameter of the relative landslide area ratio, with which a statistics is made for landslide area ratios and local terrain conditions. The results demonstrate that this ratio value is highly correlated with the three terrain variables, i.e., slope angle, local relief, and slope aspect (facing direction of the slope). In the study area, most coseismic landslides occur at loci with slope angle greater than 30°–40°, particularly the river reaches with slope angle exceeding 50°. Localized distribution of the landslides is positively correlated with terrain relief, of which majority lies at places with altitude differences over 400 m. The side slopes facing south and southeast are most prone to occurrence of coseismic landslides, which may be explained by the mainshock process that the seismogenic fault ruptured from northwest to southeast and from deep to shallow. It may also be an account on which there is no coseismic landslide southwest of the epicenter, though there also exist river reaches with steep slopes. It means that the seismic source process can pose a constraint on the control of local terrain conditions on the distribution pattern of earthquake-induced landslides.

Keywords

The 2014 Ludian earthquake Coseimic landslides Landslide area ratios Local topographic conditions Seismic source process 

Notes

Acknowledgments

We thank Wang Kun for his help in the field investigation and providing the data on the Hongshiyan landslide dam. Deep appreciation goes to anonymous referees and editor for their helpful comments. This work was supported by the National Natural Science Foundation of China (Grant No. 41572194) and the National Key Basic Research Program of China (Grant No. 2013CB733205).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Key Lab of Active Tectonics and Volcano, Institute of GeologyChina Earthquake AdministrationBeijingChina
  2. 2.China Earthquake Networks CenterBeijingChina

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