江苏高邮-宝应交界4.9级地震震害分析

Damage survey and analysis on earthquake(M_S= 4.9) at the boundary zone of Gaoyou and Baoying,Jiangsu Province

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汊苍-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。

Based on the seismographic network monitoring data and field investigation, the characteristics and damage of the Ms4.9 earthquake at the boundary zone of Gaoyou and Baoying, Jiangsu Province on July 20, 2012 have been introduced. The results of focal mechanism solution have been obtained by CAP method. According to the regional geological structure data and field investigation, the occurrence of the earthquake is probably related to the Yangchacang-Sangshutou fault. According to relation of buildings damage and earthquake responses of people and objects, the evaluation criterion of earthquake intensity suitable for this area has been drawn, and the earthquake intensity distribution has been illustrated. The earthquake damage characteristics of brick-concrete structure and brick-wood structure buildings have been analyzed and the main reasons of building damag variegated rivers areas, e have been summarized, such as low bearing capacity of foundation in poor anti-quake capacity, poor quality of construction and poor maintenance of buildings. Based on the regional differences of earthquake damage, the suggestions on new rural construction, capacity improvement of projection against earthquake disasters and researches on seismic tectonic zone of moderate and strong earthquakes have also been proposed.