Abstract: Volcanic eruption would induce a large number of secondary disasters including collapses and landslides which may lead to severe damage to people and property. The loss caused by these secondary disasters is even more than that caused by the volcano activity. Since 2002, the seismic activity of Tianchi volcano in Changbai Mountains has been abnormal, indicating the changing of the magma in the volcanic area and the eruption possibility of Tianchi volcano. Zoning of seismic collapse and landslides hazard is an effective method to reduce the loss of life and property. Volcanic earthquake was considered to be an inducing factor to collapse and landslide disasters. Seismic parameters were determined on the basis of volcanic earthquakes. Taking topographic amplification effect into consideration, simplified Newmark displacement model was used to landslide hazard zonation. The results showed that the seismic parameter did not affect the result of hazard zoning of landslide by setting different earthquake magnitude in Newmark displacement model. Hazard zoning map was divided into five risk levels, such as very high, high, medium, low, and very low. The calculation results indicated that the areas with very high hazard level were mainly distributed in three regions: the region which took Tianchi as the center and the radius is 40 km, the band area including Yanjiang Town, Liangjiang Town and Songjiang Town, and the area along the coast of the Yalu River in Changbai County.

Key words: Tianchi volcano, collapse, landslide, hazard evaluation, simplified Newmark model, volcanic earthquake