地震预警中同震位移烈度的自动化产出——以苍山5.2级地震为例

Automatic Output of Co-seismic Displacement Intensity for Earthquake Early Warning:a Case Study of Cangshan 5.2 Earthquake

本文以苍山5.2级地震为例,探讨了同震位移烈度方法在山东地区地震预警中的应用,着重介绍了同震位移烈度在预警中的自动化产出。同震位移烈度方法在强震后可以快速地得到极震区的烈度分布,能够满足地震预警的要求,但首先要建立研究区域的格林函数和断层参数的数据库,震后根据地震预警中快速定位的结果按距离最小原则调用数据库中震源附近网格点的格林函数和断层信息,生成断层模型,后台计算同震位移的分布,再通过同震位移和烈度的经验对应关系快速自动化产出发震区周围的烈度分布结果,这对强地震预警、震后快速灾害评估和应急救援都有很重要的指导作用。

Taking the Cangshan 5.2 earthquake as a case,this paper explores the use of co- seismic displacement intensity method in the Shandong area earthquake early warning. We focused on automatic output of co-seismic displacement intensity in earthquake early warn- ing. Coseismic displacement intensity method can quickly get the distribution of intensity in earthquake zone after the earthquake, which is able to meet the requirements of earth- quake early warning. First, we established the Green＇s function and fault parameters data- base of the study area. After an earthquake, based on the quickly located results, fault model can be generated according to the principle of minimum distance by calling Green＇s function and fault information near the grid points of source in the database, and co-seis- mic displacement distribution are calculated in the background. Then through the empiri- cal relation between intensity and co seismic displacement, intensity distribution results can be quickly produced around the earthquake zone. There is a very important role for strong earthquake early warning, rapid disaster assessment and guiding emergency rescue.