Prompt Assessment of Earthquake Source and Strong Motion

在日本和墨西哥的大都市地区，最近建立了宽带地震仪和强震仪的高密度网络。在本项目中，我们试图利用这些网络数据开发一个快速评估震源和强震的系统。本项目取得的主要成果如下：（1）12名日本调查员访问了墨西哥国立自治大学和国家预防犯罪中心，7名墨西哥调查员应邀访问了日本。并对瞬变资料的分析和强震的产生机制进行了有益的探讨。(2)In日本，一个数据库系统，为近500个地震台站记录的波形数据，这些台站由地方政府和大学维护。在墨西哥，在格雷罗至墨西哥城地区布置了强震仪在线阵列系统，获得了几次大地震的宝贵资料。(3)A开发了一个web系统，在大地震发生后，自动打开一个专门的主页，在主页上首先给出由瞬发分析系统获得的震源破裂过程，然后通过添加构造含义等相关信息来更新。（4）发展了三维结构强震模拟技术，并应用于1999年台湾集集地震等实际地震。

In metropolitan areas of both Japan and Mexico, high density networks of broadband seismographs and strong motion seismometers were recently established. In this project, we tried to develop a system for Prompt Assessment of Earthquake Source and Strong Motion using these network data. Major results obtained in this project are as follows :(1)12 Japanese investigators visited UNAM and CENAPRED in Mexico, and 7 Mexican investigators were invited to Japan. Then we made very useful discussion on the prompt data analysis and the mechanism of strong motion generation.(2)In Japan, a database system was devised for the waveform data recorded at nearly 500 seismograph stations which are maintained by local governments and university. In Mexico, online array system of strong motion seismographs was arranged in an area from Guerrero to Mexico City, and valuable data were obtained for several large earthquakes.(3)A web system was developed to automatically open a special home page soon after large earthquakes take place, where source rupture processes obtained by the prompt analysis system are at first given and then renewed by adding relevant information such as tectonic implication.(4)Simulation techniques were developed for strong motion generation in 3-D structure, and applied to some actual earthquakes such as the 1999 Taiwan(Chi-Chi)earthquake.