2017年九寨沟M_s7.0地震低烈度区烈度异常特征与启示
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摘要
根据九寨沟M_s7. 0地震现场调查结果,总结了甘肃文县低烈度区震害的一般特征,分析了低烈度区烈度异常点的震害特点,并对产生烈度异常的原因进行了探讨。调查和分析研究结果表明:由于研究区的建筑多在汶川M_s8. 0大地震后进行了重建或抗震加固,且地震持时较短,此次地震中低烈度区房屋震害总体较轻。然而,低烈度区存在建筑裂缝、滑坡、滑塌和桥梁损坏等显著的烈度异常现象,其主要原因是建筑场地位于滑坡体以及高陡边坡等抗震不利地带;此外,地震波的传播方向和研究区内岩土体的特性也是造成低烈度区烈度异常的重要因素。地震地质灾害需在地震烈度评定标准修订时予以重点考虑。
According to the site investigation results of Jiuzhaigou M_s7. 0 earthquake,the general characteristics of the earthquake damage in the low-intensity region of Wenxian County,Gansu Province were summarized. The characteristics of the earthquake damage at the abnormal points of intensity in the low-intensity region were analyzed.And the causes of abnormal intensity were discussed. The results of investigation and analysis show that many buildings in the study area were rebuilt or strengthened after the Wenchuan M_s8. 0 earthquake,and the duration of the earthquake was relatively short,so the earthquake damages of buildings in low-intensity region were relatively light in this earthquake. However,there were significant intensity anomalies in the low-intensity region,such as building cracks,landslides,slumps and bridge damage,which are mainly caused by the fact that the building sites are located in the anti-seismic adverse areas such as landslide and high and steep slope. In addition,the propagation direction of seismic waves and the characteristics of rock and soil in the study area are also important factors causing abnormal intensity in the low-intensity regions. Seismic geological disasters should be considered in the re-vision of seismic intensity assessment criteria.
According to the site investigation results of Jiuzhaigou M_s7. 0 earthquake,the general characteristics of the earthquake damage in the low-intensity region of Wenxian County,Gansu Province were summarized. The characteristics of the earthquake damage at the abnormal points of intensity in the low-intensity region were analyzed.And the causes of abnormal intensity were discussed. The results of investigation and analysis show that many buildings in the study area were rebuilt or strengthened after the Wenchuan M_s8. 0 earthquake,and the duration of the earthquake was relatively short,so the earthquake damages of buildings in low-intensity region were relatively light in this earthquake. However,there were significant intensity anomalies in the low-intensity region,such as building cracks,landslides,slumps and bridge damage,which are mainly caused by the fact that the building sites are located in the anti-seismic adverse areas such as landslide and high and steep slope. In addition,the propagation direction of seismic waves and the characteristics of rock and soil in the study area are also important factors causing abnormal intensity in the low-intensity regions. Seismic geological disasters should be considered in the re-vision of seismic intensity assessment criteria.
引文
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[3]石玉成,高晓明,谭明,等. 2013年岷县漳县6. 6级地震灾害损失评估[J].地震工程学报,2013,35(4):717-723.SHI Yucheng,GAO Xiaoming,TAN Ming,et al. Disaster Loss Assessment of the Minxian-Zhangxian Ms6. 6 Earthquake,2013[J]. China Earthquake Engineering Journal,2013,35(4):717-723.(in Chinese)
[4]李志强,姜立新,李亦纲,等. 2013年7月22日甘肃岷县漳县MS6. 6地震灾害特点分析[J].地震地质,2013,(3):593-603.LI Zhiqiang,JIANG Lixin,LI Yigang,et al. Analysis on the characteristics of the Ms6. 6 Minxian-Zhangxian earthquake hazard in Gansu province China on July 22,2013[J]. Seismic and Geology,2013,(3):593-603.(in Chinese)
[5]王文才,李佐唐,党红,等. 2017年8月8日四川九寨沟7. 0级地震强震记录及特征分析[J].地震工程学报,2017,39(4):652-656.WANG Wencai,LI Zuotang,DANG Hong,et al. Strong motion records and its characteristics in Jiuzhaigou Ms7. 0 earthquake on August 8,2017[J]. China Earthquake Engineering Journal,2017,39(4):652-656.(in Chinese)
[6] GB/T17742—2008.中国地震烈度表[S].GB/T17742—2008. The Chinese Seismic Intensity Scale[S].(in Chinese)
[7]田文通,孙军杰,陈双贵,等.岷县漳县6. 6级地震低烈度区民房复杂受损特征研究[J].自然灾害学报,2017,26(2):169-176.TIAN Wentong,SUN Junjie,CHEN Shuanggui,et al. Complexity analysis of rural house’s damage features in lower-intensity regions induced by Ms6. 6 Minxian and Zhangxian counties earthquake[J]. Journal of Natural Disasters,2017,26(2):169-176.(in Chinese)
[8]钟秀梅,陈文凯,侯景瑞,等.汶川地震触发武都区和文县地质灾害发育特征研究[J].岩土工程学报,2011,33(S1):356-360.ZHONG Xiumei,CHEN Wenkai,HOU Jingrui,et al. Distribution rules of geo-hazards induced by Wenchuan earthquake[J]. Chinese Journal of Geotechnical Engineering,2011,33(S1):356-360.(in Chinese)
[9]孙崇绍,闵祥仪,周民都.陇南山区局部地形对地震动强度的影响[J].地震工程学报,2011,33(4):331-335.SUN Chongshao,MIN Xiangyi,ZHOU Mindu. Influence of local topography on ground motion in mountain region of southern Gansu province[J].China Earthquake Engineering Journal,2011,33(4):331-335.(in Chinese)