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1998年张北6.2级地震宏观烈度 总被引:10,自引:2,他引:10
充分利用震害评估和宏观考察的资料 ,采用震害程度和震害指数 2个标准共同确定了1 998年张北 6.2级地震的宏观烈度。极震区烈度为 度 ,呈 NWW和 NNE双向分布 ,以NWW为主 ,面积 1 35km2 。 度区呈 NE、NW双向伸展图象 ,但是 SE方向伸展不足 ,面积约340 km2。地震重伤人员普遍集中在 度区和 度区。 度区亦呈 NE、NW双向伸展图象 ,但是 NW、SW方向延伸长 , 度区面积约 1 0 0 0 km2 。宏观震中 :北纬 41°0 9′,东经 1 1 4°2 7′。在极震区的 NNE、SSW和 NWW方向 ,存在 3个烈度异常区 ,它们分别在极震区 3个分支的延伸方向上。文中讨论了烈度不高而震后较重的原因。震区没有发现地表破裂带 ,也没有发现第四纪强烈活动的大型断裂。极震区为主的 NWW方向和震前存在的小地震条带吻合 ,暗示可能存在成因上的联系 相似文献
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总结了根据应急科考震害调查资料确定的2003年8月16日内蒙古MS5.9地震的震害分布特征, 利用中国数字地震台网(CDSN)的长周期波形资料, 反演确定了该地震的地震矩张量解和震源机制解. 根据震源机制解、 余震分布和震害分布特征, 探讨了震害分布特点与震源机制的关系. 从全球强震记录、 历史地震资料和该地震的震害特点, 讨论了强地面运动的特点与震中区物理背景的关系. 调查表明, 此次地震的极震区呈东西走向, 与震源机制反演结果得到的断层走向一致. 极震区面积相对较大, 单层土木结构和砖木结构的房屋受损较严重, 可能与当地的震源物理环境有一定关系. 相似文献
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汶川大地震震害特点与成因分析 总被引:3,自引:0,他引:3
郭迅 《地震工程与工程振动》2009,29(6)
2008年5月12日汶川地震造成巨大人员伤亡和财产损失.本文从工程抗震角度分析了震区房屋倒塌的原因,指出地震时房屋倒塌与否与诸多因素有关.在此基础上,分析了汶川地震震害严重的四个主要因素:震级大,烈度高,断层破裂长;震区人口稠密,房屋、路桥等人工工程多;抗震设防水平低;地震诱发地质灾害严重.最后,将汶川地震震害与1976年唐山地震震害作了对比.所得结论可供理解汶川地震震害、改进结构抗震设计参考. 相似文献
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通过分析唐山市古冶区地震地质资料、历史地震资料并结合唐山市7.8级大地震强余震的分布规律等,综合确定唐山古冶区预测震害烈度,为房屋震害预测分析提供依据。 相似文献
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Boming Zhao Xiwei Xu School of Civil Engineering Beijing Jiaotong University Beijing China National Center for Active Fault Studies 《地震学报(英文版)》2009,(2):175-179
Major cases of the MS8.0 Wenchuan earthquake are obtained through field investigations of the epicenter and high-intensity areas, and the relationships among earthquake faults, ground motion and earthquake disasters near fault zones are analyzed.Both strong deformation and ground rupture lead to significant damages of the buildings, indicating that it is necessary to keep safe distance away from active faults and to take other necessary measures.There are two reasons for that the buildings near the surface ... 相似文献
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An MS 6.4 earthquake occurred in Yangbi, Yunnan province, on May 21, 2021. According to related investigations, the macro-epicenter of the earthquake is 6 km northwest of Yangbi County, and the seismogenic structure is the NW-trending Weixi-Qiaohou fault. The earthquake area is located in the hinterland of the Hengduan Mountains in the northwest of Yunnan province, a region dominated by high and medium-high mountains, with deep canyons and tectonic basins in between. Various geomorphic features are derived from drastic topographic changes and huge geological differences in the earthquake area. There are a variety of buildings in the earthquake-affected zone, including civil and brick-wood structures ones with weak seismic performance, as well as brick-concrete and frame ones with better seismic performance. This paper summarizes and analyzes different characteristics of the earthquake in different geomorphic units through field investigations of different buildings and geological disasters in the affected area. The results show that under the same earthquake intensity, the damage to most buildings (located in slope areas or rooted in weak strata) is amplified by the earthquake. The earthquake has exerted an obvious propagation effect along the direction of the seismogenic structure. Moreover, local ground fissures will aggravate the damage to the buildings even without surface dislocation. Thus, we suggest that attention should be paid to the ground fissures caused by the slope effect. The fissure areas may also be the disaster spot of collapses and landslides in case of a high-magnitude earthquake. 相似文献
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城市建构筑物地震损失预测研究 总被引:12,自引:0,他引:12
本文提出了预测城市建构筑物在不同烈度下地震灾害损失的简易方法。首先分析了影响城市建构筑物抗震能力的3个因素——抗震设防情况、建筑年代和结构类型;然后提出了建构筑物抗震能力指数的概念,并确定了将上述3因素综合成建构筑物抗震能力指数的方法;最后利用“九五”期间所做的大中城市的震害预测结果统计回归出房屋抗震能力指数与地震灾害损失——人员伤亡、经济损失和震后恢复时间的关系。由此可以得到建构筑物在不同烈度下地震灾害损失的简易计算方法。 相似文献