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通过对2006年5月27日印度尼西亚日惹6.4级地震灾情调查和评估,得出此次地震灾情分布具有以下特征:(1)尽管日惹地震震级较小,但形成的灾害却很严重,地震形成了2个重灾区,即班图尔(Bantul)重灾区和克拉特恩(Klaten)重灾区;(2)建筑物结构不合理、建筑物质量和材质差,建筑物抗震性能差,灾区场地环境不良,加之灾区人口密度大和地震发生在凌晨等,是此次小震大灾的主要原因;(3)对地震构造背景以及与默拉皮火山(Merapi Volcano)相关性进行了初步研究,提出此次地震与火山活动密切相关。 相似文献
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印尼8.7级巨震后云南地震活动的频度变化 总被引:1,自引:0,他引:1
0引言
2004年12月26日在印尼苏门答腊西北近海发生了8.7级巨震,3月29日在距8.7级地震破裂区东南160km又发生了一次8.5级地震。8.7级地震发生后,余震向震中以北扩展达千米以上。如此剧烈的能量释放,对我国的地震活动有何影响是令人关注的,但清晰解答这个问题并非易事,主要原因是,一个地区的大地震发生后如何影响另一个地区地震活动的机制目前我们并不清楚。这个机制可能很复杂,涉及到应力在地壳和地幔内的传播、积累,以及与地质构造等的关系。因此,仅从时间尺度上判定一个地区的大地震对另一个地区地震活动是否有影响在认识上就存在分歧。例如,是一个地区的大地震发生后的波动在传播到另一个地区时直接触发的地震活动才被看作是影响?还是由于一个地区的大地震发生后的应力释放和调整影响到另一个地区的地震活动才被看作是影响?显然,这两方面的影响在时间尺度上存在差异。8.7级地震发生后不到20分钟,在我国云南的宾川发生了4.6级地震,其发震时间也是8.7级地震的面波到达该地区的时间(李刚等,2005); 相似文献
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随着城市建设的发展和人口密度的增大,地震对人类的危害变得越来越大,做好建筑物震害预测工作具有非常重要的现实意义,根据“合肥市防震减灾信息系统”中合肥市中市区底层框架砖房的抗震调查资料,用结构易损性分析方法对该类房屋的未来震害进行了预测分析。 相似文献
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2004年12月26日印尼8.7级地震及其对我国大陆地震趋势的影响 总被引:7,自引:0,他引:7
本文简要介绍了2004年12月26日印尼苏门答腊西北近海8.7级地震发生背景,基于1900年以来全球8.5级以上地震活动之后我国大陆地震活动情况以及这印尼8.7级地震产生的附加应力场,分析了这次地震对我国大陆地区地震趋势的可能响,讨论了印尼爪哇海沟地区发生的7级以上地震与我国大陆7级以上地震的对应关系。 相似文献
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城市地震灾害综合易损性分析方法探讨 总被引:2,自引:0,他引:2
从建筑结构、生命线系统、经济系统、人群4个方面分析了城市的易损性,并分别讨论了各个因素的易损性分析方法,同时介绍了ULEDRI综合指数法,最后以杭州市为例初步评价了杭州市中心6区的相对易损程度。 相似文献
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The Indonesian region is one of the most seismically active zones on the earth. On December 26, 2004, an M_S 8.7 earthquake (as measured by the China Seismograph Network, or M_w = 9.3 as measured by USGS) struck the west coast of northern Sumatra, Indonesia. By its magnitude it is classified as the world's fourth largest earthquake since 1900 and the largest one since the 1964 Alaska earthquake. The spatial distribution of the relocation of larger aftershocks (M>4.5) following the main shock suggests a length and width of the rupture of about 1200km and 200km, respectively. The shock triggered massive tsunamis that affected several countries throughout South and Southeast Asia. It is a shallow interplate event of thrust type in the trench. Its epicenter is located at the northwestern end of the Indonesia-Melanesia plate boundary tectonic zone. In 2004, eight shocks of M≥7.0 occurred in this area, showing a migration from east to west. It implies that these shocks represent a correlated and consistent dynamic process along this subduction zone. These interplate events are associated with convergence of several plates and their fast motion in this region, which result in strong and complex structures and deformation. The India-Australia plate is underthrusting toward the Sunda continental block or Burma plate at a low angle, producing a great locked area on the shallow portion of the subduction zone where enormous strain is accumulated. Interseismic uplift recorded by coral growth and horizontal velocities measured by GPS show the geometry of the locked portion of the Sumatra subduction zone. The vertical and horizontal data reasonably match with a model in which the plate interface is fully locked over a significant width. This locked fault zone extends to a horizontal distance of 132km from the trench, which corresponds to a depth of 50km. The sudden ruptures and large-scale slip of this locked area as a release of stress occurred, are the direct cause of the M8.7 earthquake near Indonesia in 2004. 相似文献
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The Indonesian region is one of the most seismically active zones on the earth. On December 26, 2004, an Ms 8.7 earthquake (as measured by the China Seismograph Network, or Mw = 9.3 as measured by USGS) struck the west coast of northern Sumatra, Indonesia. By its magnitude it is classified as the world's fourth largest earthquake since 1900 and the largest one since the 1964 Alaska earthquake. The spatial distribution of the relocation of larger aftershocks ( M 〉 4.5) following the main shock suggests a length and width of the rupture of about 1200km and 200km, respectively. The shock triggered massive tsunamis that affected several countries throughout South and Southeast Asia. It is a shallow interplate event of thrust type in the trench. Its epicenter is located at the northwestern end of the Indonesia-Melanesia plate boundary tectonic zone. In 2004, eight shocks of M≥ 7.0 occurred in this area, showing a migration from east to west. It implies that these shocks represent a correlated and consistent dynamic process along this subduction zone. These interplate events are associated with convergence of several plates and their fast motion in this region, which result in strong and complex structures and deformation. The India-Australia plate is underthrusting toward the Sunda continental block or Burma plate at a low angle, producing a great locked area on the shallow portion of the subduction zone where enormous strain is accumulated. Interseismic uplift recorded by coral growth and horizontal velocities measured by GPS show the geometry of the locked portion of the Sumatra subduction zone. The vertical and horizontal data reasonably match with a model in which the plate interface is fully locked over a significant width. This locked fault zone extends to a horizontal distance of 132km from the trench, which corresponds to a depth of 50km. The sudden ruptures and large-scale slip of this locked area as a release of stress occurred, are the direct cause of the M8.7 earthquake near Indonesia in 2004. 相似文献
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初步分析了2004年印尼苏门答腊岛西海岸Mw9.0大地震的地质构造环境,回顾性研究了震前NCEP增温异常和天体引潮力附加构造应力变化。结果表明:主震临震期间NCEP全球分析温度资料(1 000 hPa)沿岛弧地震构造带具有明显增温异常和清晰的初始增温→加强→高峰→衰减→发震的时空演变规律;地震序列活动与增温异常起伏变化对应良好;主震和强余震皆发生在发震断裂带上的天体引潮力附加应力绝对值最大时段。此典型大震再次说明:NCEP温度资料与天体引潮力结合是地震短临预测的一个有希望的新思路。 相似文献
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历史地震档案资料在防震减灾中的应用 总被引:6,自引:0,他引:6
介绍了历史档案资料在防震减灾中的意义和中国近50年来在整理历史地震资料方面所做的工作及历史地震档案资料在工程地震及地震烈度区划中的应用。 相似文献
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2012年4月11日印尼苏门答腊发生8.6级、8.2级地震,我国大量地下流体台站记录到丰富的同震响应现象,甘肃地下流体观测资料也出现不同程度的同震响应。本文分析两次大地震时甘肃地区数字化水位、水温同震变化特征和响应能力,得到大部分井水位的同震响应有较一致的变化规律,且以振荡变化为主,震后较快恢复到原有状态,响应程度也与震级密切相关,即震级越大响应能力越强;由于水温和水位有不同的响应机理,因此水温不遵循这种规律,水温观测只有2个井点记录到同震响应,且记录的幅度基本相当,变化周期较大,恢复时间也较慢。 相似文献
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阐述了地震预报在政府和社会防震减灾工作中的重要意义,并针对当前地震预报中存在的问题,提出了需要采取的措施和对策。 相似文献
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在收集、整理和编译国外有关论坛和研讨会资料的基础上,给出了目前国际风险科学研究的动态,综述了地震灾害风险评估和减轻地震易损性方面的研究进展,介绍了目前有关国家的地震灾害风险减轻的理论研究和减灾计划与行动。 相似文献