ArcGIS空间分析建模在火山次生崩塌滑坡危险性分区评价中的应用

The application of Model builder in hazard zoning of landslide caused by volcanic earthquake-taking Tianchi volcano as an example

火山喷发前与喷发过程中常伴生地震活动,诱发大量的崩塌滑坡灾害,造成大量的生命、财产损失。简化的Newmark模型目前被广泛应用于区域性的地震诱发崩塌滑坡危险性评价工作中。本文将火山地震作为崩塌滑坡灾害的诱发因素并设置地震参数,在收集火山地震震源数据的基础上,基于Arc GIS平台构建了一个Model Builder模型,该模型通过计算临界加速度ac、Arias强度Ia分区图,并将其作为中间变量带入Newmark位移计算模型求得累积位移分区图。以长白山天池火山为例,运用该模型对长白山地区火山地震诱发下崩塌滑坡危险性进行评价,评价结果表明:通过构建Model Builder模型可以大大简化危险性评价的计算过程,同时具备可重复操作的特点。

A large amount of seismic activity could be induced during the eruption of the volcano.Landslides and collapses caused by the Volcanic earthquake may cause serious life and property loss.The simplified New-mark model was widely being used in the Landslide hazard zoning work.The volcanic earthquakes were treated as a triggering factor of landslide disaster and the seismic parameters were being set.A model Builder model was constructed After collecting the seismic source data of volcanic earthquake.The Newmark cumulative dis-placement zoning map was being calculated by calculate the Zoning map of critical acceleration ac and Arias intensity Ia.Taking Tianchi volcano in Changbai Mountain as an example,the hazard assessment of landslide and collapse in Changbai Mountain area was carried out by the model that was designed.The evaluation results showed that the model can greatly simplify the calculation process of the risk assessment,and has the characteristics of repeatable operation.