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    The Anomalous Seismic Pattern Appeared Before Chengwu Earthquake (M=4.8),Shandong Province
    山东成武4.8级地震前异常地震图象
    2. Before the mainshock, there had existed anomalous seismic quiescence for as long as 42 months in sub-region B (M≥3. 5 ) and 32. 5 months in sub-region C (M≥3. 0), where occurre the mainshock and aftershocks; the confidences are checked to be at levels of 0. 99 and 0. 97 respectiviy.
    ②在包含主震和余震区的中区,主震前分别出现了持续时间长达42个月(M≥3.5)和32.5个月(中′区,M≥3.0)的异常地震活动平静,并在0.99和0.97的置信度水平上通过统计显著性检验;
    Property Identification of Anomalous Seismic Bodies by GMES Techniques, A Case History
    综合物探技术识别地震反射异常体属性(英文)
    By using the Tangshan Earthquake and the others as examples,the anomalous seismic activities and their precursory variations related to the induced action have been analysed.
    以唐山地震等实例分析了与诱发有关的异常地震活动和前兆变化。
    The result shows that (1) there was anomalous seismic quiescence with a duration of 38 months in the subregion located in west part of aftershock area,which is significant statistically at confidence level of 0. 99 and larger by β-test;
    研究表明:(1)在余震区西半部的分区中,主震前出现了持续时间为38个月的异常地震活动平静,异常在置信水平大于0.99上通过β统计显著性检验。
    The volcanicrocks cause various anomalous seismic reflections in seismic section because of theirstructural shapes,occurrence and distributions.
    由于火成岩具有不同的构造形态、产状特征、分布规律,因此,在地震剖面上出现各种各样的反射异常现象。
    The results show that those two parameters could better express the anomalous seismic quiescence and anomalous seismic clustering within the seismic zone be- fore strong earthquakes.
    结果表明,该二参量能较好地反应强震前中短期阶段孕震区及其周围地区地震活动的异常平静及丛集的现象。
    Using 3 D visualization,coherent data volume,horizontal slice and map analysis to finely interpret the 3 D structures,the ability using seismic exploration for identifying underground complex geologic structure and anomalous seismic reflecting body has been greatly improved.
    应用三维可视化、相干数据体、水平切片和图分析等手段进行三维构造精细解释 ,明显提高了地震勘探识别地下复杂地质构造及地震异常反射体的能力。
    After studying different kinds of earthquake activities systematically, we have found that about 83% of the anomalous seismic bands, seismogenic gaps and signal earthquakes with magnitudes 3 or 4 appeared at the same time before moderately strong earthquakes (ML36) since 1970 in North China.
    系统研究了多种地震活动性方法后认为,1970年以来华北地区发生的Ms≥5.8中强震前,约83%具有3级或4级地震异常条带、孕震空区及信号震出现。
 

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