甘肃夏河MS5.7地震烈度评定及震害特征分析
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"十三五"国家重点研发计划项目(2017YFC1500905)


Seismic Intensity Evaluation and Damage Characteristicsof Xiahe, Gansu MS5.7 Earthquake
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    摘要:

    在预评估地震影响范围的基础上,通过对2019年10月28日夏河5.7级地震进行现场震害调查、灾情分析,绘制出地震烈度图并得出此次地震的震害特征。结果表明:此次地震最高烈度为Ⅶ度(7度),该区面积为193 km2,Ⅵ度(6度)区面积为1 398 km2;震区范围内,房屋类型大多数为木构架承重的土木结构,极震区多数房屋外层土墙开裂、坍塌较为严重,但承重木构架出现轻微倾斜和局部破坏现象,无完全倒塌房屋;震区内大多数寺庙基本完好,个别寺庙部分墙体有轻微裂缝;沿着断裂带展布方向,灾情呈现带状分布特征;震区半山腰上的建筑物灾情较为严重,山体放大效应和边坡效应明显。根据对地震灾害特征的分析,提出了增强房屋抗震性能、合理选址,加强防震减灾知识宣传教育等建议。

    Abstract:

    On the basis of the estimated earthquake-affected area and by conducting an in situ investigation and disaster analysis, we drew a seismic intensity map and determined the damage characteristics of the Xiahe, Gansu M5.7 earthquake that struck on October 28, 2019. The maximum intensity of the earthquake was Ⅶ degree, the affected area measured 193 km2, and the VI degree area measured 1 398 km2. In the earthquake region, most houses were civil structures supported by wooden frames. In the meizoseismal area, the cob walls of most houses were severely cracked and collapsed, but their load-bearing timber frames only showed a slight tilt and partial damage without complete collapse. Most temples were basically intact and showed only slight cracks on specific walls. The disaster presented a zonal distribution along the distribution direction of the fault zone. The damage to the buildings on the mountainside were relatively severe, thereby indicating the obvious mountain amplification effect and slope effect of the earthquake. Considering these disaster characteristics, we offered a number of suggestions for enhancing the antiseismic performance of buildings and strengthening the publicity and education related to earthquake prevention and disaster reduction.

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马小平,孙艳萍,陈文凯,张苏平,高安泰,刘岸果,朱瑞.甘肃夏河MS5.7地震烈度评定及震害特征分析[J].地震工程学报,2020,42(3):777-783. MA Xiaoping, SUN Yanping, CHEN Wenkai, ZHANG Suping, GAO Antai, LIU Anguo, ZHU Rui. Seismic Intensity Evaluation and Damage Characteristicsof Xiahe, Gansu MS5.7 Earthquake[J]. China Earthquake Engineering Journal,2020,42(3):777-783.

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  • 收稿日期:2019-12-25
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  • 在线发布日期: 2020-07-23