中国西南地区强震烈度衰减模型的研究

Intensity Attenuation Model of Strong Earthquakes in Southwest China

本文将研究范围限定在西南地区,因其具有相似地形地貌特征和发震构造的区域,并选取1913年以来6.5级以上的典型震例作为研究对象,通过对数据的分析统计,得到了传统的烈度衰减椭圆模型不适用于7.0级以上强震的结论;根据烈度区域面积与震级、破裂长度与震级以及缓冲区分析的方法得到了更加符合强震烈度衰减规律的断层距模型;在面积统计关系对比和实际烈度分布的综合对比中,得到了适用于强震的较为合理的烈度衰减模型,并根据本文得到的烈度衰减规律,结合ArcGIS二次开发,编写了用于快速绘制等震线的控件。本文的研究结果对于震后快速评估和地震应急有着现实意义。

In this paper,the study area is restricted area of similar topography and seismogenic structure in Southwest China.Taking earthquakes above M6.0 in the recent 100 years as the research object,and finally through analyzing the statistical data,we draw the conclusion that the traditional intensity attenuation elliptical model can not be applied to strong earthquakes above M7.0.Meanwhile,based on the analysis of the relation between intensity area and magnitude,of the relation between rupture length and magnitude,and of the buffer area.We present a fault distance model more applicable to the strong seismic intensity attenuation law.Through the comparison of area statistical relationship and actual intensity distribution,we also obtain a more reasonable intensity attenuation model applied to strong earthquakes.Based on the intensity attenuation model,combined with ArcGIS secondary development,we developed a control software to be used in drawing isoseismal quickly and can help a lot in fast aftershock assessment and earthquake emergency drill.