摘要
2017年01月28日02时46分,四川省宜宾市筠连县(北纬28.09度,东经104.72度)发生4.9级地震,震源深度11千米。根据现场调查发现在筠连县乐义乡出现了地震烈度Ⅶ度异常点。结合地震现场震害调查资料和历史地震资料,对烈度异常点震害特点进行了分析,并从地质构造环境、建筑物结构、近期地震活动等方面对震害异常原因进行了初步探讨。分析表明,造成异常点建筑物震害较重的主要原因是震区广泛含有煤层、页岩气等不良影响地层;震区的建筑结构不合理,抗震性能极差;3次4级以上地震震害叠加影响。最后对震区房屋建设提出几方面建议。
On 28 January 2017 , an earthquake with M4. 9 magnitude struck Julian Country. The epicenter is latitude 28.09 degrees north and longitude 104.72 degrees east and the focal depth is 11 km,Yibin City, Sichuan Prov-ince. According to field investigation, an abnormality intensity point （VII） in Julian is located in Leyi town. Com-bining with seismic damage investigation data and historical earthquake data, we analyze the reason of intensity ab-normal points and preliminarily discuss the reason of seismic damage abnormality in terms of geological tectonic en-vironment, building structure and the recent earthquake activity. Our analysis shows that the reasons can be conclu-ded as the following four points ： Firstly, there are loose layers like coal bed, shale gas in the seismic area. Second-ly ,the building structure is unreasonable and its anti-seismic ability is very poor. Thirdly 3 times above M4. 0 earthquakes increase the damage degree. Finally, some suggestions are put forward for housing construction in the disaster area.
出处
《四川地震》
2017年第3期10-14,共5页
Earthquake Research in Sichuan
关键词
烈度异常
震害特点
异常分析
intensity anomaly
seismic damage characteristics
abnormal analysis
