Prompt Assessment of Earthquake Source and Strong Motion

在日本和墨西哥的大都市地区，最近建立了高密度的宽带地震仪和强震地震仪网络。在本项目中，我们试图利用这些网络数据开发一个震源和强震快速评估系统。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的UNAM和CENAPRED，7名墨西哥调查员应邀访问了日本。在日本，建立了由地方政府和高校维护的近500个地震台站的波形数据数据库系统。在墨西哥，从格雷罗到墨西哥城的一个地区布置了在线强震阵列系统，获得了几次大地震的有价值的数据。(3)开发了一个网络系统，在大地震发生后不久自动打开一个专门的主页，在那里首先给出由即时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)开发了三维结构强震产生的模拟技术，并应用于一些实际地震，如1999年台湾(集集)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.