**6. Conclusions**

A strong earthquake can induce a chain of disasters. The disaster chain from the 2008 Wenchuan earthquake has been discussed.

The characteristics of the earthquake induced landslides have been summarized as follows.


Comparing the simulated results with the actual event, we found that they are in good agreement with each other. Therefore, the proposed approach has been shown applicable and useful for predicting the movement of potential debris flow arising from earthquake.

Fig. 28. The movement of the debris flow (a) for t=10s, (b) t=76s, (c) t=120s, (d) t=150s and (e)

A strong earthquake can induce a chain of disasters. The disaster chain from the 2008

The characteristics of the earthquake induced landslides have been summarized as follows.

2. Large quantities of large-scale landslides (113) occurred and are listed in this chapter.

for the distribution of the maximum depth of Hongchungou debris flow.

1. A large number of landslides (56,000) were induced by the earthquake;

**6. Conclusions** 

Wenchuan earthquake has been discussed.

Fig. 27. Identified landslides as loose material of the debris flow


The susceptibility analysis of the earthquake induced landslides has been carried out by both statistical analysis and ANN analysis based on slope units rather than the traditional grids. The relationship of landslide distribution with individual causative factor has been investigated. It has been found that slope gradient, elevation, slope range, the distances to the fault, the distances to a stream have contributed to landslides while specific catchment area, slope aspect and lithology have no clear relationship. A susceptibility map has been made for analysis of the earthquake induced landslides in Qingchuan County.

A Multiplex Acceleration Model has been proposed for analysis of the long run-out mechanism based on trampoline effect. Table model tests and DDA simulation were carried out. It has been shown that the proposed Multiplex Acceleration Model is reasonable and applicable.

The earthquake induced landslides can easily form debris flows after the earthquake. The characteristics of the debris flows arising from the 2008 Wenchuan earthquake have been summarized as follows.


An approach of simulating debris flow has been proposed. The earthquake induced landslides are identified by RS with object-based analysis method, which can overcome the problem of the so-called 'salt and pepper' appearance existed in the traditional spectral information based image analysis method. A practical simulation has been carried out and the proposed approach has been shown effective and useful for estimating the movement behaviours of a potential debris flow arising from a strong earthquake.
