Revaluation of accurate ground motion distribution in Sendai area during the 1978 Miyagi-ken Oki earthquake and damage distribution

这份研究报告描述了从2003财年到2005财年的三年研究结果。本研究的目的是：首先，根据地震和地质环境的最新知识，对1978年宫城县冲地震中仙台地区的地震动场进行准确的分布评估；其次，阐明地震动特性与建筑物震害特征之间的关系；第三，研究受地质环境影响的建筑物结构的最优抗震设计和抗震加固。2003财政年度，建立了地震观测网，以评估不同土壤条件下的观测地震动特性和建筑物的行为。在总共25个观测点安装了小型地震仪(18个点…更多地感谢基础设施、土地和交通部的研究基金)。研究了既有建筑结构的抗震优化设计方法和加固优先评估方法，利用2005/08/16宫城大地震和其他地震的观测记录，在2004财年和2005财年对基于最新地质信息构建的地下模型进行了仿真分析验证。在讨论了2005年地震和1978年地震地面运动特征差异的基础上，重新评价了1978年地震时仙台地区的地面运动分布。在Nagamachi、Oroshimachi和Kamisugi地区观察到的建筑物损坏特征与评估的地面运动特征一致。在此基础上，对考虑地震动分布的建筑结构抗震优化设计和加固进行了研究。为支持市政府主管人员，开发了公共建筑抗震加固优先评估系统。较少

This research report describes the results of a 3-year research, from the fiscal year 2003 to 2005. The research aims first to make an accurate ground motion distribution in Sendai area during the 1978 Miyagi-ken Oki earthquake, which was evaluated based on the recent knowledge of the earthquake and the geological circumstances ; second, to clarify the relation between ground motion characteristics and building damage features during the earthquake ; and third, to investigate the optimal seismic design and seismic retrofit of building structures considering ground motion characteristics affected by the geological circumstances, including surface layers and the deep underground structure.In the fiscal year 2003, an earthquake observation network was constructed in order to evaluate observationally ground motion characteristics and buildings' behavior during earthquakes in different soil conditions. At the total number of 25 observation points small seismometers were installed (18 points … More thanks to the research fund of the Ministry of Infrastructure, Land and Transport). An optimal seismic design method and retrofit priority evaluation method of existing building structures were investigated.In the fiscal years 2004 and 2005, the underground model constructed based on the recent geological information was verified by means of a simulation analysis using the observation records of the 2005/08/16 Miyagi-ken Oki earthquake and other earthquakes. After discussing the difference of ground motion characteristics of the 2005 earthquake and the 1978 earthquake, the ground motion distribution in Sendai area during the 1978 earthquake was revaluated. Building damage features observed at Nagamachi, Oroshimachi, and Kamisugi areas became consistent with the evaluated ground motion characteristics. Furthermore, optimal seismic design and retrofit of building structures considering the ground motion distribution were investigated. A seismic retrofit priority evaluation system of public buildings was developed for supporting municipal government officials in charge. Less