共查询到20条相似文献，搜索用时 46 毫秒
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天山地震活动区地下水同震、震后效应的研究 总被引：1，自引：0，他引：1
前言一个完整的地震过程应当包括震前孕育、震时发生和震后调整全过程。研究震时、震后效应对认识震源形成及前兆异常演变过程 ,预报后续地震 (强余震、强震群、相关地震和成组地震 )以及评定地震烈度和灾害都具有重要意义。作者收集分析了中国新疆、哈萨克斯坦、吉尔吉斯斯坦、乌兹别克斯坦、塔吉克斯坦、土库曼斯坦等天山地震活动区 1 970年以来 48次地震 ( M≥ 5 .0 )、35 0多项地下水地震异常资料。研究表明 :地下水动力学和水文地球化学参数不仅在震前表现出明显的前兆异常变化 ,而且在震时和震后异常效应也十分普遍和强烈。震时、震… 相似文献
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探讨了断层间相互作用产生的同震库仑应力改变及对地震的触发与延缓效应，并以鲜水河断裂带不同断裂段时间上连续发生的4次MS6.0以上地震为例，计算和分析了每次地震发生后，在周围其它断裂上产生的同震库仑应力改变及其对后续地震的触发，以及1973年炉霍MS7.6地震和1981年道孚MS6.9地震发生后，在其周围最易破坏失稳的微破裂上产生的同震库仑应力改变及对余震活动的影响．在其它条件保持不变的情况下，将这4次地震的累积触震与缓震效应加以定量考虑，对鲜水河断裂带各断裂段的地震潜势进行了重新计算，并与已有预测结果进行对比分析，检验和评估了鲜水河断裂带断层间相互作用触震与缓震效应的重要性．结果表明:鲜水河断裂带每次地震都发生于受其先前发生的地震影响而产生同震库仑应力增加的断裂段上，不同断层间相互作用的触震和缓震效应导致地震复发概率的改变可高达30.5％以上， 主震后的余震大多发生于同震库仑应力增加较高的微破裂上． 相似文献
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自2000年庐江地震台数字化水位、水温观测以来，在多次大地震中水位、水温均有明显的同震效应，四川汶川8．0级地震、日本本州9．0级地震引起汤池1号井水位、水温的同震特征。动水位同震效应表现为脉冲变化，震后水位逐渐升高；水温表现为阶跃下降，震后水温缓慢恢复到正常状态。 相似文献
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通过分析江苏句容16井2001～2007年间几次远大震的同震效应现象，发现苏16井动水位和水温资料对震级大于Ms7．5，震中距800～5000km不等的远大震，有较明显的同震效应反映，且动水位和水温的同震阶变总是上升，幅值随震级的增大而增大，随震中距的增大而减小。本文对苏16井动水位和水温同震效应的同步变化机理进行了初步探讨。 相似文献
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《Advances in water resources》2005,28(7):701-710
The patterns of temporal variations of precipitation (P), streamflow (SF) and baseflow (BF) as well as their nitrate-nitrogen (nitrate) concentrations (C) and loads (L) from a long-term record (28 years) in the Raccoon River, Iowa, were analyzed using variogram and spectral analyses. The daily P is random but scaling may exist in the daily SF and BF with a possible break point in the scaling at about 18 days and 45 days, respectively. The nitrate concentrations and loads are shown to have a half-year cycle while daily P, SF, and BF have a one-year cycle. Furthermore, there may be a low-frequency cycle of 6–8 years in C. The power spectra of C and L in both SF and BF exhibit fractal 1/f scaling with two characteristic frequencies of half-year and one-year, and are fitted well with the spectrum of the gamma distribution. The nitrate input to SF and BF at the Raccoon watershed seems likely to be a white noise process superimposed on another process with a half-year and one-year cycle. 相似文献
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燕郊等测点迁移优化与地磁观测研究 总被引：1，自引：2，他引：1
为优化地磁观测条件，开展了燕郊、夏垫等测点迁移工作；按照测眯迁移原则与实施技术方案，完整地收集并整理了地质构造与地球物理等方面的基本资料；进行了野外实地勘察，磁场梯度的测量，确定了新测点，在新老测点上进行了较长时间的地磁场对比观测；应用多种方法分析研究了地磁对比观测资料，结果表明，新老测点与有关测点的地磁变化具有良好的一致性，并得到了新老测点之间的地磁数据的按点差。 相似文献
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Summary This paper discusses the influence of system stiffness on the dynamic instability of fault surfaces under laboratory conditions for a number of test modes. In conjunction with shear load stiffness, the normal load stiffness, often neglected, is shown to have a considerable effect on the stick-slip process —its presence or absence and its characteristics. Also appropriate stiffnesses are suggested for an earthquake sequence modeled as a growing dislocation. 相似文献
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Vindell Hsu Charles E. Helsley Eduard Berg David A. Novelo-Casanova 《Pure and Applied Geophysics》1984,122(6):878-893
A close correlation in spatial distribution of local seismic activity and energy release patterns before and after the 1979 Petatlan, Mexico earthquake suggests heterogeneity within the fault plane of this major low-angle thrust event associated with subduction along the Middle America Trench. A simple two-asperity model is proposed to account for the complexity. Foreshocks and aftershocks of the neighboring 1981 Playa Azul earthquake showed a similar pattern. As both events occurred at the junction of the Orozco Fracture Zone and the Middle America Trench, we speculate that the observed complex fault plane is caused by subduction of the rugged ocean floor of the Orozco Fracture Zone. Short-term precursory seismicity prior to the Petatlan earthquake can be explained by using the asperity model and migration of a slip front from the south-east to the north-west across the main shock source region. 相似文献
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