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介绍了青海省兴海７．０级地震前水氡，地下水位，地表形变，地震活动性，气象及动物等出现的异常，并对震前的预报作了简介。 相似文献
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本文介绍了淮阴１号桥钢筋混凝土组合梁桥面系的施工工艺，钢梁及斜索的安装，桥面混凝土裂缝控制等方面的问题。 相似文献
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本文对1988年6月四川省道孚八美(即乾宁)4.5、5.0、4.0级地震前后地震活动进行了研究,给出了地震参数、P波初动解、余震序列和前兆变化的分析及未来地震危险性的讨论。 相似文献
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瓦屋山水电站水库诱发地震危险性研究 总被引：1，自引：0，他引：1
瓦屋山水电站位于川南台陷南端，南邻峨眉山断块，水库南缘的毛沟断裂最新活动时期为晚更新世，水库处于活动性大地构造环境中，该区属于名山－马边－昭通过地震北段，以弱震活动为主，伴有少量中强地震，目前正处于地震活动期，从分析库区地质构造，水文地质，工程地质，地震活动等条件，并使用水库综合影响系数法，贝叶斯概率预测法，断层强度分析法，判定库区存在着发生构造型水库诱发地震的可能性，诱发地震强度Ｍｓ≤５．５。划 相似文献
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唐山地震与海城地震之共性特征及关问题的讨论 总被引：1，自引：0，他引：1
本文在前人研究的基础上，详细分析了１９７６年唐山７．８级地震与１９７５年海城７．３级地震的共性特征，认为它们可能是由同一种原因引起的，而且伴随地震而发生的各种现象是相互联系，同出一因的，本文还分析了一些有关的现象，论述了上次两次地震的发生可能可由垂直力引起的，地壳内岩源上涌可以产生垂直作用力，认为这两次地震的发生可能是岩浆上涌的直接结果。 相似文献
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1994年第一季度，全球地震活动仍为中等水平，三个月内共发生三次7级以上浅源地震。秘鲁－玻利维亚边界发生大深震。美国加州又发生强烈地震。大洋岛弧地震带本季度地震活跃。伊朗发生三次6级地震。 相似文献
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A methodology is proposed to determine design earthquakes for site-specific studies such as the siting of critical structures (power plants, waste disposals, large dams, etc.), strategic structures (fire stations, military commands, hospitals, etc.), or for seismic microzoning studies, matching the results of probabilistic seismic hazard analyses. This goal is achieved by calculating the source contribution to hazard and the magnitude–distance deaggregation, showing that, varying the selected frequency and the level of hazard, the reference earthquakes are changed as a result. A procedure is then adopted to minimize the residuals between the uniform hazard spectrum (target motion) and the design earthquake spectrum, to provide a specific earthquake scenario encompassing all the frequencies of the target motion. Finally, some considerations on the use and the influence exerted by ground motion uncertainty (σ) on hazard deaggregation are outlined. 相似文献
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近年来土遗址受城市建设和交通施工损害的现象时有发生,对于这些人为因素对遗址的影响缺乏有效的检测与评估手段。本文基于G7高速公路的爆破振动观测,进行质点峰值加速度和峰值速度的衰减分析,开展爆破震动对附近明水军事要塞土遗址震动影响的研究。通过对竖向、水平向的振动加速度和速度的观测和数据分析,得出不同药量条件下,对应相同质点的震动峰值加速度衰减规律。提出了公路爆破附近土遗址震动控制范围和最大药量的施工建议,为爆破附近有土遗址的施工提供了数据支持,相应的结论和建议可以在同类土遗址保护中参考使用。 相似文献
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T. Abdallatif A.E. El Emam M. Suh I.A. El Hemaly H.H. Ghazala E.H. Ibrahim H.H. Odah H.A. Deebes 《Geophysical Prospecting》2010,58(2):307-320
The main outbuildings of the Amenemhat II pyramid complex in Dahsour were yet to be discovered due to a very long subjection of the area to the military authorities and also the demolition of the pyramid itself. We describe the discovery of some of these outbuildings using near‐surface magnetic investigations. A gradiometer survey was conducted in the area east of the pyramid to measure the vertical magnetic gradient with a high resolution instrument at 0.5 m sampling interval. The data showed some undesirable field effects such as grid discontinuities, grid slope, traverse stripe effects, spikes and high frequencies originating from recent ferrous contamination. These undesirable effects were addressed to produce an enhanced display. We have successfully detected four main structures in the area east of the pyramid; the causeway that connected the mortuary temple with the valley temple during the Middle Kingdom of the 12th Dynasty, the mortuary temple and its associated rooms, ruins of an ancient working area and an Egyptian‐style tomb structure called a Mastaba. An improved recognition for these structures was accomplished by using the analytic signal and Euler deconvolution techniques. Excavation of a small part within the study area has proven the reliability of magnetic discoveries and the shallowness and composition of the detected features. 相似文献
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复杂度理论为研究地磁变化场提供了新思路和新途径.地磁变化场从物理起源上可以看作是一种复杂系统,因此,本文从军事工程应用需求出发,基于复杂度理论,提出运用样本熵、多尺度熵及滑动窗样本熵方法对不同磁扰程度下的地磁变化场时间序列进行复杂度特征分析,结果表明：（1）样本熵和多尺度熵能够很好地表征地磁扰动强度及演化特征,启发我们可设计一种新的“熵指数”来衡量地磁扰动大小;（2）滑动窗样本熵能够准确定位地磁扰动时间段,对于磁暴识别与预测、空间灾害性天气预警等有一定的参考价值;（3）Mackey-Glass时滞混沌方程随时间的演化呈现出与地磁场日变曲线非常相似的形态,因此,地磁变化场或许可用时滞混沌方程来表示,对于我们更好地认识地磁变化场物理机理、建模预测与地磁寻的等军事工程应用都有一定的意义. 相似文献
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The Carlo's V Castle, located in Crotone Town, on the Ionian coast of the Calabria Region (Italy), date back to the 13th century d.C. (Fig. 1). During its long life, the building changed several owners and sustained the damages and the consequent reconstructions due to the innumerable naval battles. Moreover, the castle suffered the action of the earthquakes which always afflict the region.With the principal aim of detecting the location, depth and geometry of the rests of destroyed structures, a systematic Ground Penetrating Radar (GPR) survey was carried out in the area inside the boundary walls. The results are sixty-two one-meter-spaced, filtered and migrated radargrams arranged in four 3D data-sets. From each data-set, the most significant time-slice was extracted.To reduce the ambiguity in the GPR data interpretation, additional geophysical techniques, such as Magnetic (M), and Electrical Resistivity Tomography (ERT), were carried out with a partial superimposition with the GPR data. A comparison and a joint interpretation amongst different geophysical data pointed out some very remarkable features associated to buried remains and possible buried cannonballs.With the secondary aim to check the presence of an old military walkway linking two bastions a GPR profile was carried out on the sea side boundary wall. The GPR results are in agreement with an ERT survey carried out on the same profile and consistent with the presence of an underground passage. 相似文献
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世界多极化和经济全球化是一种必然趋势，和平与发展虽然是主流，但我国国家安全形势不容乐观，同样面临严峻的挑战.与国家安全相关的地球物理学研究领域很广，主要涉及空间物理学、大气物理学、军事海洋学、空间遥感物理与监测和固体地球物理学.在这些领域中存在众多需要解决的问题，本文列举了一系列亟需研究的重要问题.在此基础上，笔者归纳出国家安全地球物理学的若干研究方向是：（1）具有明显或潜在国家安全应用价值的地球物理理论、方法技术研究；（2）国家安全地球物理装备（仪器）设施研究；（3）国家安全地球物理学中的数据处理理论、方法和技术研究；（4）重大国家安全地球物理学问题研究.由于国家安全地球物理学的研究任务多种多样、且各有侧重，如海、陆、空和二炮，都有各自的研究重点，不能一概而论.以二炮部队所涉及的军事地球物理学研究而论，研究方向应包括：（1）军事情报侦测保障中的地球物理问题研究（包括侦测与反侦测）；（2）作战运用与保障（测地、气象、空间天气、遥感）中的地球物理问题研究；（3）与战略导弹部队作战相关的地球物理武器和地球物理战研究；（4）国防工程中的地球物理应用研究. 相似文献