Assessment of Seismic Local-Site Effedcts at Plural Test Sites

该项目集中于验证和识别场地对地震运动的影响，这对于定量预测强地面运动是不可避免的。单独的研究项目是开发一种确定速度结构的方法，分析放大(或去放大)因素，并对地震运动进行数值模拟。与纵波勘探相比，确定S波的速度结构一般要困难得多：然而，主要由日本发展起来的微震阵列分析面波反演方法，比目前的勘探方法有很大的优势，特别是在城市地区或沉积盆地进行勘探时。这是在Euro-Seistest测试该方法的非常好的机会，因为有大量的数据可以比较。在本项目中，土耳其发生了地震，我们介绍了了解局部破坏分布原因的方法。我们在格勒诺布尔盆地进行了实验，那里也进行了许多地震学实验和分析。2002年1月举行了一次小型研讨会，讨论和整合了结果，邀请了来自海外(美国、法国、土耳其和台湾)的四位杰出研究人员。通过这个项目，我们可以确认同时进行岩土工程调查和密集地震观测以确定场地特征的研究的优势|在未来的强震预测工作中。

This project concentrated to validate and discriminate the site effects on seismic motion that are inevitable for quantitative prediction of strong ground motion. The individual research projects were to develop a method for determining velocity structure, analyze the amplification (or de-amplification) factors and simulate seismic motion numerically. To determine S-wave velocity structure is generally far difficult compared with the P-wave prospecting : However, the surface wave Inversion using array analysis of microtremors, mostly developed in Japan, has great advantages than the current prospecting methods, especially in conducting at urban areas or sedimentary basins. It is very good opportunity to test the method at Euro-Seistest, because there exist lots of data to compare. During this project, the Turkey earthquake occurred and we introduce the method to understand the reason of localized damage distribution. We carried out the experiment at Grenoble basin where many seismological experiments and analysis have also been conducted. A small symposium was held in January 2002, to discuss and integrate the results, inviting the four distinguished 'researchers from oversea, (USA, France, Turkey, and Taiwan). Through this project, we could confirm an advantage of the study that simultaneously conduct geotechnical surveys and dense observation of earthquakes for site characterizations |n future work of predicting strong ground motion.