SEISMOLOGY AND GEOLOGY ›› 2013, Vol. 35 ›› Issue (3): 593-603.DOI: 10.3969/j.issn.0253-4967.2013.03.013

• CONTENTS • Previous Articles     Next Articles

ANALYSIS ON THE CHARACTERISTICS OF THE MS6.6 MINXIAN-ZHANGXIAN EARTHQUAKE HAZARD IN GANSU PROVINCE,CHINA ON JULY 22,2013

LI Zhi-qiang1, JIANG Li-xin2, LI Yi-gang3, YU Shi-zhou4, LU Ning5, LI Meng6, YUAN Zhi-xiang7, FENG De-chun8   

  1. 1. Institute of Geology, China Earthquake Administration, Beijing 100029, China;
    2. China Earthquake Networks Center, Beijing 100045, China;
    3. National Earthquake Response Support Service, Beijing 100049, China;
    4. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;
    5. Earthquake Administration of Qinghai Province, Xining 810001, China;
    6. Earthquake Administration of Xinjiang Uighur Autonomous Region, Urumqi 830011, China;
    7. Earthquake Administration of Shaanxi Province, Xi'an 710068, China;
    8. Earthquake Administration of Gansu Province, Lanzhou 730000, China
  • Received:2013-08-01 Revised:2013-08-23 Online:2013-09-30 Published:2013-10-12

2013年7月22日甘肃岷县漳县MS6.6地震灾害特点分析

李志强1, 姜立新2, 李亦纲3, 余世舟4, 卢宁5, 李锰6, 袁志祥7, 苏永齐8   

  1. 1. 中国地震局地质研究所, 北京 100029;
    2. 中国地震台网中心, 北京 100045;
    3. 中国地震应急搜救中心, 北京 100049;
    4. 中国地震局工程力学研究所, 哈尔滨 150080;
    5. 青海省地震局, 西宁 810001;
    6. 新疆维吾尔自治区地震局, 乌鲁木齐 830011;
    7. 陕西省地震局, 西安 710068;
    8. 甘肃省地震局, 兰州 730000
  • 作者简介:李志强,男,1969年生,1997年在中国地震局地质研究所获博士学位,研究员,主要从事地震灾害方面的研究工作,电话:010-62009090,E-mail:lzhq@ies.ac.cn。
  • 基金资助:

    "十二五"国家科技支撑计划项目(2012BAK15B05-02)资助

Abstract:

At 7: 45 on July 22,2013,an MS6.6 earthquake hit Minxian County(34.5°N,104.2°E)of Dingxi City in Gansu Province,which brought 95 deaths and after which an emergency response of second grade was declared by China Earthquake Administration. In this earthquake,the intensity of the meizoseismal region is Ⅷ.Buildings in quake-hit region are mainly of civil structure and timber structure,which account for more than 90%.Unfortunately the anti-seismic ability of these two kinds of buildings is poor. To make things worse,most of them are old. And it had been rainy for days before the earthquake,which lowered the support ability of the foundation and the wall. After the earthquake,in comparison with other earthquakes,buildings of civil structure and timber structure are damaged more heavily in the region of the same intensity,and the damage of buildings of both brick structure and brick-concrete structure is obviously lighter. Significantly thick loess coverage and continuous rainfall gave birth to many landslides. For these reasons,the regions of both Ⅷ and Ⅵ intensity are relatively larger. Dingxi City,which the earthquake hit,is one of the most undeveloped regions in China,and the proportion of buildings of civil structure and timber structure,which behaved badly in the earthquake,is abnormally large. Thus it is suggested that the reconstruction aid should be expanded so that buildings can be built with the masonry-timber and brick-concrete as the main structures.

Key words: Minxian-Zhangxian MS6.6 earthquake, earthquake hazard, emergency science research

摘要:

2013年7月22日在甘肃省定西市岷县—漳县交界地区(34.5°N,104.2°E)发生MS6.6地震,造成95人死亡,中国地震局启动地震应急Ⅱ级响应。根据现场调查,这次地震最高烈度为Ⅷ度。震区建筑90%以上为土木结构和木结构,且多为老旧房屋,抗震性能差。加之震前灾区持续降雨,造成房屋地基和生土墙体支撑强度降低。与其他地震区相比,相同烈度下土木结构和木结构破坏比例偏大,砖结构和砖混结构破坏明显偏轻。降雨加上巨厚的黄土沉积,导致地震滑坡比较严重。由于这些原因,Ⅷ度区范围偏大,Ⅵ区也相对较大。甘肃定西是中国经济欠发达地区之一,土木结构和抗震性能较差的木结构房屋比例过大。震后重建中,建议以砖木结构和砖混结构为主重建灾区。

关键词: 岷县漳县MS6.6地震, 震害, 应急科考

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