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2012-02-16河源发生4.8级地震,地震发生后,广东省地震局地震现场工作队迅速赶赴现场,进行地震加密观测、震害调查评估、科学考察、新闻宣传、协助当地政府决策等地震现场应急处置工作,通过分析河源4.8级地震应急处置工作中的震前准备、震后应急以及在地震应急工作中遇到的问题,对地震应急处置工作提出改进的建议和未来发展的对策。 相似文献
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作者根据多次现场地震工作的实践经验,从现场地震工作的阶段划分、组队规模、指挥部组成、工作总部署、震情监测分析、宏观考察、社会经济影响、对外宣传、与地方政府的联系、文书通信、政治思想保证、后勤保证和现场工作总结等13个方面对现场地震工作的组织、管理进行了讨论。文中指出了各项工作的要点及应注意的事项。 相似文献
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由国家地震局科技监测司组织编写,苗良田、刘正荣等主编的《地震现场工作大纲和震情分析指南》将于1990年第四季度由地震出版社出版。该书是在系统总结20多年地震现场工作实践经验的基础上,针对地震现场工作的特点、各主要环节制订出的一套规范性工作纲要和分析指南,是统一地震现场工作主要技 相似文献
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地震现场监测工作 总被引:2,自引:2,他引:0
申俊 《地震地磁观测与研究》2017,38(4):246-250
破坏性地震发生后,立即开展地震现场监测工作尤为重要。论文概述了地震现场监测工作的主要任务和组织管理规定,重点分析中国大陆6次强地震发生后现场监测工作,通过总结已有工作经验,就进一步提高地震现场监测效能提出相关建议,认为应扎实做好准备工作,健全制度,提高地震现场监测工作现代化和智能化水平。 相似文献
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汶川地震对芦山地震及周边 断层发震概率的影响 总被引:6,自引:0,他引:6
大震后区域静态库仑应力变化常常被用于解释区域地震活动性速率的变化、 主震断层外余震的发生以及即将失稳断层的地震发生概率的变化. 2013年4月20日芦山MS7.0地震的发生重新引起了对2008年5月12日汶川MS8.0大地震的热议. 利用含(滑移)速率和状态的摩擦定律, 结合汶川大地震前后的地震活动性水平, 定量化计算了汶川地震后雅安地区发震概率的变化, 并着重解释了芦山地震发震的可能根源. 此外, 还对库仑应力明显增加的鲜水河断层和熊坡断层进行了发震概率的定量化计算, 计算结果与中国地震台网中心的地震目录基本符合. 鲜水河断层从汶川地震后至今近5年来未发生M>6.0地震, 而M>6.0的发震概率已约为60%; 熊坡断层自汶川地震以来尚未发生M>4.0地震, 芦山地震后M>4.0的发震概率已接近90%. 所以, 我们认为鲜水河断层附近将成为M>6.0地震的重点防范地区, 熊坡地区将来仍旧存在发生中强地震的危险性. 相似文献
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非齐次复合 Poisson地震发生概率模型研究 总被引:4,自引:0,他引:4
依据现有地震发生概率模型合理性与局限性以及地震估计的基本思想提出五类非齐次复合 Poisson 地震发生概率模型,阐述各模型的基本特点及可能实用的前提。 以华北地区的地震序列为例大致模拟了不同阶段的地震发生概率水平,分析表明非齐次复合 Poisson 地震发生概率模型更能反映地震发生的时间不均匀性。 相似文献
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MDCB-5型临震信息监测仪模拟未来震级大小计算初探 总被引:1,自引:0,他引:1
根据MDCB-5型临震信息监测仪记录到的某一地震临震异常幅度(电压值)、持续时间(天数)与岩石破裂、地震发生、地震波能量释放的相关性,从地震发生的物理基础出发,推导出了2个计算未来震级大小的理论公式。使用44天的监测数据对该期间发生的5次6级以上地震的震级进行了计算,在相应的震中距范围内计算的震级与实际发生的震级误差小于0.5级,初步说明了该方法应用于实际地震预报具有一定的参考价值。 相似文献
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本文搜集与整理了我国几十次大、中强地震,震前、震时的地倾斜异常图象,按其形态大致可分为五类:Ⅰ.震前倾斜记录曲线渐变——回复——发震(多见于远震);Ⅱ.震前倾斜记录曲线突变(阶跃)——发震(多见于近震);Ⅲ.震前倾斜记录曲线扰动或单向脉冲——正常——发震;Ⅳ.震前倾斜潮汐记录曲线畸变——发震;Ⅴ.震前倾斜记录曲线脉动(曲线加粗)——发震,其特征为:1.异常形态呈多样性;2.异常出现在震前几分钟到几十小时;3.异常幅值一般在几毫秒至十分之几角秒(10-8——10-6rad),个别达几角秒(10-5rad);4.异常倾斜方向多半与震中方位有关;5.异常有由远及近、从外到内(震中)的迁移现象。文章作者还结合模拟实验和地震模式,讨论了地震前倾斜异常的有关问题。 相似文献
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— We construct a viscoelastic FEM model with 3-D configuration of the subducting Philippine Sea plate in Southwest Japan to simulate recent 300-year kinematic earthquake cycles along the Nankai-Suruga-Sagami trough, based on the kinematic earthquake cycle model. This 300-year simulation contains a series of three great interplate earthquakes. The inclusion of viscoelasticity produces characteristic velocity field during earthquake cycles regardless of the assumed constant plate coupling throughout the interseismic period. Just after the occurrence of interplate earthquakes, the viscoelastic relaxation creates the seaward motion in the inland region. In the middle period, the seaward motion gradually decreases, and the resultant velocity field is similar to the elastic one. Later, just before the next interplate earthquake, displacements due to the interplate coupling in the viscoelastic material are distributed more broadly in the forearc region than in the purely elastic one, since the viscoelastic relaxation due to the previous earthquake mostly disappears. The effects of such interplate earthquake cycles on five major inland faults in southwest Japan, where large intraplate earthquakes occurred during this period, are quantitatively evaluated using the Coulomb failure function (CFF). The calculated change in CFF successfully predicts the occurrence of the 1995 Kobe earthquake (M~7). The occurrence of other inland earthquakes, however, cannot be explained by the calculated changes in CFF, and especially the 1891 Nobi earthquake (M~8), the largest inland earthquake in Japan, which occurred at the time close to the local minimum of CFF. This implies that further improvements are necessary for our FEM modeling, such as the modeling of steady east-west compressive force and stress interactions between the inland faults. 相似文献
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Stuart Wier 《Physics of the Earth and Planetary Interiors》1981,24(1):30-32
Immediately after the Oaxaca earthquake of November 29, 1978, the rate of occurrence of earthquakes (magnitude mb ? 4.9) increased all along the Mid-America Trench, and stayed above the average level for the area for five months. The highest rate was recorded in the month just after the Oaxaca earthquake, after which the rate gradually declined for five months. No aftershocks of the Oaxaca earthquake are included in the counts. The past seismicity history of the area suggests that it is unlikely that the simultaneous timing is a simple matter of coincidences. These observations suggest that motion of the Cocos plate is episodic, and that stress changes are rapidly transmitted throughout the plate. 相似文献
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Another comparative interpretation was conducted with respect to the data from 5 DSS profiles in the central and southern parts of Shanxi, leading to the conclusion that in Linxian, Linfen and Xingtai earthquake regions, through which the five profiles pass, there exist anomalous crust-mantle structure and abyssal crustal faults extending to Moho, all being regarded as the deep indications for earthquake occurrence. 相似文献
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对地震预报的科学思考(二)——前兆观测研究及加强地震综合预报研究的方向和重点 总被引:4,自引:0,他引:4
根据浅源地震发生的物理实质和孕震物理过程的主要特征,把地震前兆观测的努力方向概括为"把握实质,优选项目;靠近震源,合理布局",并把地震前兆分为两类:第一类为"直接前兆",主要包括地震活动、地壳形变和地下流体等;第二类为"次生前兆",主要包括地电阻率、地磁和动物习性行为等。文中认为,为推进地震预报研究的深入和预报水平的提高,必须牢牢把握浅源地震发生的物理实质,推进地震预报理论、方法的创新;必须推进地震和前兆观测技术,尤其传感技术的创新,并调整、优化地震监测台网;必须正确认识预报经验的科学性与局限性,重视地震预报经验正确的继承与发展。 相似文献
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Through analysis we found that some mesoscale anomalous regions (101–102 km) of meteorological parameters such as the special drought areas, unusual warm areas, the largest snowfall center, low
pressure area together with the epicenter area of M
S=6.2 Zhangbei earthquake on January 10, 1998 are located at the same area, i.e. there appears the “Five areas corresponding”
phenomenon. Meanwhile, three times of low pressure evolution are generated and develop in the earthquake area in five days
after the occurrence of the earthquake. The abnormal variation of the lower limit of frozen soil layer shows indirectly that
unusual warm in earthquake areas are related to the upward thermal conduction from the deeper layer of earth surface. 相似文献