Studies on Application of Microtremors for Evaluating Ground Motion Characteristics during an Earthquake

本研究的主要目的是：1）明确地脉动的起源和基本特征; 2）确定应用方法和应用范围; 3）仪器的规格、制造和测试; 4）为地脉动测量准备一个有用的指南; 5）准备一个地脉动测量的租赁系统，以鼓励进一步的研究活动的微震。基于这些原因，我们在1993年钏路大地震后在钏路地区安装了一个试验场，进行了微动的联合测量。当我们讨论结果时，1993年至1995年发生了许多地震灾害。最严重的破坏发生在1995年兵库县南部地震之后。因此，我们不得不进行类似的联合测量的微动，我们试图在钏路地区。虽然我们没有足够的时间来完成详细的分析，测量数据将提供大量的信息，在未来的地震小区划和城市规划的破坏区。

The principal objectives of this study were, 1) to make clear the origin source and the fundamental characteristics of microtremors, 2) to confirm applying methodologies and the limit of application, 3) specification, manufacturing, and testing of instruments, 4) preparing an useful guideline for microtremor measurements, 5) preparing a rental system for microtremor measurements, to encourage the further research activities of microtremors. For these reasons, we installed a test field to make joint measurements of microtremors in Kushiro area after the 1993 Kushiro-oki earthquaka. While we were discussing about the results, many earthquake disasters took place from 1993 to 1995. The severest damage followed after the 1995 Hyogoken-nanbu earthquake. Therefore we had to make the similar joint measurements of microtremors just we tried in Kushiro district. Although we could not have enough time to accomplish the analyzes in detail, the measured data will provide a lot of information for making seismic microzoning and city planning in the damaged areas in the future.