Characteristics of landslides induced by the great Wenchuan earthquake

Abstract

The great Wenchuan (汶川) earthquake induced a large quantity of landslides. They are widely distributed and caused tremendous damages. The sliding mechanism and characteristics of these earthquake-induced landslides are different from those of conventional gravity landslides. Their occurrences are apparently controlled by the powerful earthquake, and they are characterized by high potential energy sliding and ejection sliding. In this article, the earthquake-induced landslides are classified, the characteristics of the sliding and destruction of these landslides are described, and the relationship between the earthquake and the landslides is analyzed. The Donghekou (东河口) landslide is used as an example to characterize fast-moving long-distance earthquake-induced ejection slippage and landslide. This research suggests that many phenomena and issues related to earthquake-induced landslide are beyond current recognition and knowledge, and new methodologies should be adopted to consider the effect of the earthquake as the paramount factor in the development of landslides. Furthermore, the study of fast-moving long-distance earthquake-induced landslides can also shed light on the formation of old and ancient landslides.

Keywords

Wenchuan earthquake / giant landslide / ejection landslide / high potential energy landslide

References

[1] Chen, Y. T., Xu, L. S., Zhang, Y., et al., 2008. Report on the Wenchuan Large Earthquake Source of May 12, 2008. http://www.csi.ac.cn/Sichuan (2008-05-25) (in Chinese)

[2] Li D. W.. The Mechanism and Forecast of Earthquakes within the Continental Plate. Geological Science and Technology Information, 2008, 27(5): 1-6.

[3] Wang J. D., Zhang Z. Y.. Study on Systematic Engineering Geology of Typical Loess Landslide Group, 1999, Chengdu: Sichuan Science & Technology Press 88-94.

[4] Wang T., Ma Y. S., Long C. X., . A Preliminary Analysis on Sichuan Wenchuan Earthquake Fault Activities and Secondary Geological Hazards. Geological Bulletin of China, 2008, 27(11): 1913-1922.

[5] Wang W. M., Zhao L. F., Li J., . The Course of Sichuan Wenchuan Richter Scale 8.0 Earthquake Epicenters. Chinese Journal of Geophysics, 2008, 51(5): 1403-1410.

[6] Yin Y. P.. Study on Geological Hazards by Wenchuan Richter Scale 8.0 Earthquake. Journal of Engineering Geology, 2008, 16(4): 433-444.

[7] Zhang P. Z., Xu X. W., Wen X. Z., . Slip Rate and Recurrence Interval of Longmenshan Active Fault Zone, and Tectonic Implication for the Mechanism of the May 12 Wenchuan Earthquake, 2008, Sichuan, China. Chinese Journal of Geophysics, 2008, 51(4): 1066-1073.

[8] Zhou R. J.. Active Tectonics of the Longmenshan Region on the Eastern Margin of the Tibetan Plateau. Acta Geologica Sinica (English Edition), 2007, 81(4): 593-604.