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anomalous seismic
相关语句
  地震异常
     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。
短句来源
     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。
短句来源
  “anomalous seismic”译为未确定词的双语例句
     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
短句来源
     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;
短句来源
     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)
短句来源
     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。
短句来源
     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。
短句来源
更多       
  相似匹配句对
     ANOMALOUS VARIATIONS OF SEISMIC ACTIVITIES BEFORE LARGE EARTHQUAKES
     大地震前地震活动的异常变化
短句来源
     SEISMIC TRAVELTIME TOMOGRAPHY FOR DETECTING LOCAL ANOMALOUS BODY
     局部异常体井间地震走时层析成像研究
短句来源
     On seismic resolution
     地震分辨率
短句来源
     Seismic Radar
     地震雷达
短句来源
     The Anomalous X-ray Pulsars
     反常X射线脉冲星的研究进展
短句来源
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  anomalous seismic
(2002) to find regions of anomalous seismic activity associated with large earthquakes identified the location of an Mw = 5.6 earthquake near Calexico, Mexico.
      
Anomalous seismic effect under volcanoes and some features of deep-seated structure of volcanic areas
      
The anomalous seismic activities before four moderately strong earthquakes occurred in the northwestern and southwestern China in recent years are studied by the two methods.
      
What are the anomalous seismic reflection bodies at depths of over 6000 m? Are they reefs or igneous rock? This is a difficult problem for seismic techniques, but the GMES technique can handle it.
      
Property identification of anomalous seismic bodies by GMES techniques, a case history
      
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This paper has discussed the induced action among the great intraplate earthquakes.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.The preceding great earthquake can probably trigger a series of moderate and small earthquakes----the precursory earthquakes in the consequently great earthquake generating area.On the certain seismic belt,the areas in which the moderate and small...

This paper has discussed the induced action among the great intraplate earthquakes.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.The preceding great earthquake can probably trigger a series of moderate and small earthquakes----the precursory earthquakes in the consequently great earthquake generating area.On the certain seismic belt,the areas in which the moderate and small earthquakes occur firstly after the preceding great earthquakes are probably at best the areas where the consequently great earthquakes take place.An AFB induced chain has been constituted by the preceding great earthquake,the precursory earthquakes and the consequently great earthquake.Some clues have been provided for the studies of the large scale stress field and for the prediction of the great earthquakes.

本文讨论了板内大地震之间的诱发作用。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。先发大震可以激发后继大震孕育区内发生一系列中小地震——前兆地震。一个地震带内,先发大地震后,首先发生中小地震的地方是最可能发生后继大震的地区。由先发大震、前兆地震和后继大震构成了AFB诱发链。为研究大范围应力场和大震预报提供一些线索。

Before strong earthquakes, certain anomalous features may show up in the seismicity of a broad region possibly caused by the concentration of stress and the ensuing anelastic deformation at the source region of the earthquakes. Certain parameters of seismicity with rather obvious physical meanings and supported by the results of rock fracture experiments, are selected for the study, namely the areal extent A of the seismic active area, seismic energy released E, accumulative numbers Σ N of earthquakes and the...

Before strong earthquakes, certain anomalous features may show up in the seismicity of a broad region possibly caused by the concentration of stress and the ensuing anelastic deformation at the source region of the earthquakes. Certain parameters of seismicity with rather obvious physical meanings and supported by the results of rock fracture experiments, are selected for the study, namely the areal extent A of the seismic active area, seismic energy released E, accumulative numbers Σ N of earthquakes and the value b of large and small earthquakes and so on. A method of scanning has been adopted to search at first for the dangerous location under which a strong earthquake is in the process of development and then by applying time scanning to show further the transition from medium to medium-short range of anomalous features of seismic activity before the occurrence of a large earthquake.On the basis of scanning on the observed seismicity data of North China, Southwest China and Northeast China before several large earthquakes, emphasis has been laid on the anomalous seismic feature of North China before the 1976 Tangshan Earthquake of magnitude 7.8. The paper also discusses the different roles played by the parameters of seismicity in mediumterm prediction of strong earthquakes. It is believed that such a method of time and) space scanning, particularly of the b value has certain significance in medium-term earthquake prediction.

在大地震发生之前,伴随着应力的集中加强及其在震源附近区域引起的非弹性变形,区域地震活动性可能呈现某些异常特征.本文选择一些有明显物理意义并得到岩石破裂实验支持的地震活动性参数,例如有震面积数 A、平均释放能量(?)、地震累加频度 ∑N 和大小地震比例系数 b 值等,采用扫描方法在大范围内搜索,识别孕育强震的危险地区,并对“假想孕震区”进一步做时间扫描计算,寻找并判断大震前由中期异常过渡到中短期异常的阶段,在对华北、西南及东北若干强震资料扫描计算的基础上,着重剖析唐山地震前华北地区区域地震活动异常变化的一些特征.讨论了上述地震活动性参数在强震中期预报中的不同效能,认为这种时空扫描方法,特别是 b 值扫描应用于强震的中期预报是有一定意义的.

Kelation between apparent velocity-ratio and real velocity-ratio of thecrustal medium has been discussed in the present paper. Theoretical values of the apparent velocity-ratio γ have been calculated supposing that the crust consists of two horizontal layers and that within the upper layer of the crust there exists a zone of anomalous seismic velocity, upper and lower boundaries of which are horizontal. The results obtained indicate that in certain cases the anomaly fails to be detected by horizontally...

Kelation between apparent velocity-ratio and real velocity-ratio of thecrustal medium has been discussed in the present paper. Theoretical values of the apparent velocity-ratio γ have been calculated supposing that the crust consists of two horizontal layers and that within the upper layer of the crust there exists a zone of anomalous seismic velocity, upper and lower boundaries of which are horizontal. The results obtained indicate that in certain cases the anomaly fails to be detected by horizontally propagating direct waves (as, for example, direct waves do not pass through the anomalous zone, or the horizontal extent of the anomalous zone is rather small and so on). However, on the basis of variations of γ values it is still possible to be detected if the reflected waves pass through the anomalous zone.Seismic data recorded by seismic station at Liyang, Jiangsu from explosions at Maanshan Iron Mine have been studied using the above mentioned method. Negative anomaly of γ values is detected prior to the Liyang, Jiangsu earthquake (July 9, 1979, Ms =6.0). Average amplitude and duration of the anomaly are 5% and 15-17 months respectively. The anomaly could well be explained, if the path length of the direct waves within the anomalous zone is rather small, or they do not pass through the anomalous zone at all.The present paper indicates that by means of artificial wave sources in detecting precursory variations of seismic wave velocities the results might be improved, if reflected waves are used.

本文讨论了视波速比与介质真实波速比的关系。假设地壳为水平双层结构,上层地壳内包含一个水平延伸的波速异常区.计算了γ的理论值。结果表明,对于以往用水平传播的直达波测不出异常的某些情况(例如直达波没有穿过异常区;异常区的水平尺度很小等),只要反射波穿过异常区,根据γ值的变化,仍有可能把异常较为有效地检测出来。 应用这一方法研究了溧阳地震台记录的马鞍山人工爆破资料,发现1979年7月9日溧阳6.0级地震前γ值呈现负异常,平均幅度约为5%,异常时间为15—17个月。为了解释这一异常,直达波在异常区内的路程应当很短,或者根本不穿过异常区。 本文结果表明,主要使用反射波,可能会改善用人工波源方法观测震前波速变化的前景。

 
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