基于GIS的数字等震线模型

Digital Isoseisms Model Based on GIS

借助于GIS技术,完成了云南及其邻区175个强震的175幅(439条)等震线图的制作。把历次历史地震的等震线置于同一比例尺下,并在GIS平台上计算各等震线的长度和各烈度区的面积是一项创新。该项工作为等震线的研究、烈度衰减和等震线模型的研究提供了最基本的数据。在所绘制的数字等震线的基础上,对等震线的长、短轴进行了统计分析,最后完成了数字等震线模型量板表,用于查阅不同震级、不同烈度等震线的长度。

With the help of GIS technology, we finished the digital isoseisms drafting of 175 strong earthquakes （439 isolines）. It is an innovation taking the historical isoseisms under the same scale and calculating the lengths of isoseisms axes and the areas of intensity regions on GIS platform. This work provides the most basic data for the studies of isoseisms, intensity attenuation and isoseisms model. On the basis of the digital isoseisms, we made the statistical analyses of the lengths of long and short axes, and finally finished a graticule table for the model of the digital isoseisms, which can be used to refer to the lengths of different isoseisms with different magnitude.