江苏高邮-宝应交界4.9级地震震害分析

本文根据台网监测资料及现场调查结果,介绍了2012年7月20日江苏高邮、宝应交界4.9级地震的基本特征,给出了本次地震的震源机制解,结合区域地质构造背景与现场宏观调查结果分析认为,本次地震的发生可能与杨汉苍-桑树头断裂有关.以现场调查资料为基础,对震害进行分析,提出了本地区地震烈度评价标志,并给出了本次地震的烈度分布图.根据砖混结构、砖木结构房屋的震害特点,认为水网地区地基条件差、抗震能力差、建筑质量差和年旧失修是房屋严重破坏的主要原因.针对地震灾害的地区性差异,给出了加快推进新农村建设、提高农村民居抗御地震灾害能力和加强中强地震孕震发震研究等建议,以期为震害调查和地震灾害的预测预防提供参考.     

汶川地震远场地震动特征及其对长周期结构影响的分析

汶川8．0级大地震中,中国数字强震动台网获得了大量的数字强震动记录,这些记录特别是远场记录具有丰富的长周期地震动分量。本文根据东南强震动中心获取的区域数字强震动记录,分析汶川8．0级地震的远场地震动特征,研究了基岩场地及深厚软弱场地的长周期地震动及其差异;根据长周期结构的特点,选取建于深厚软弱场地上的江苏A050强震台的超长地震记录进行结构地震反应分析,研究汶川8．0级地震对远场长周期结构的影响,并结合实际震害特点,提出了长周期结构抗震及地震安全对策中一些值得注意和思考的问题。     

江苏高邮、宝应交界4.9级地震的震害分析

Based on the network monitoring data and field investigations, the basic characteristics of the Ms4. 9 earthquake at the juncture of Gaoyou and Baoying in Jiangsu Province on July 20, 2012 have been introduced, and the focal mechanism solutions have also been obtained. According to the regional tectonic features and site macroscopic survey, the occurrence of the earthquake was probably related to the Yangchacang-Sangshutou fault. Based on site survey data, both the evaluation criterion of seismic intensity of this region and the seismic intensity maps have been proposed. According to the damage characteristics of brick-concrete structure and brick-wood structure, the main reasons of serious damage for buildings are poor foundation conditions, low seismic bearing capacity, poor quality of construction and disrepair. Considering the differences of earthquake damage in the different regions, advice on accelerating the new rural construction, improving the resistance against earthquake disasters of rural residential areas and strengthening the seismogenic research on strong and moderate size earthquake is proposed, which will be possibly helpful for earthquake damage survey, prediction and prevention.