基于简化Newmark模型的长白山天池火山诱发崩塌滑坡危险性评价

doi:10.13278/j.cnki.jjuese.201703203

摘要/Abstract

摘要： 火山喷发过程所伴生的地震活动会诱发大量的崩塌滑坡次生灾害，其所造成的人员财产损失甚至超过火山活动本身。2002年以来长白山天池火山区地震活动的异常，表明火山深部的岩浆正在发生变化，天池火山存在喷发的危险。地震崩塌滑坡的危险性区划是降低生命财产损失的有效手段。将火山伴生地震作为崩塌滑坡灾害的诱发因素并据此设置地震参数，利用简化的Newmark累积位移模型，考虑地形因素对地震的放大效应，对长白山地区天池火山喷发下次生崩塌、滑坡灾害的危险性进行评价。通过探讨不同地震震级下的危险性分区结果，认为不同地震参数的设置对危险性分区结果没有影响。将研究区划分为极高、高、中等、低、极低等5个危险等级，其中，极高危险区主要分布在3个区域：以天池口为中心，40 km为半径的范围内；沿江乡—两江镇—松江镇条带区域；长白县境内鸭绿江沿岸区域。

关键词: 天池火山, 崩塌, 滑坡, 危险性评价, 简化的Newmark模型, 火山地震

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

中图分类号:

P642.4

秦胜伍, 马中骏, 刘绪, 李广杰, 彭帅英, 陈骏骏, 翟健健. 基于简化Newmark模型的长白山天池火山诱发崩塌滑坡危险性评价[J]. 吉林大学学报(地球科学版), 2017, 47(3): 826-838.

Qin Shengwu, Ma Zhongjun, Liu Xu, Li Guangjie, Peng Shuaiying, Chen Junjun, Zhai Jianjian. Hazard Assessment of Collapse and Landslide Induced by Tianchi Volcano in Changbai Mountain Area Based on Simplified Newmark Displacement Model[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(3): 826-838.

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