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earthquake source region
相关语句
  震源区
     Analysis on Uncertainty Factors of Potential Earthquake Source Region
     潜在震源区不确定性因素分析
短句来源
     It can be concluded: 1) isolated earthquake features simple earthquake dislocation mode, high or very high stress drop, low or very low apparent stress and low heterogeneous level of medium in earthquake source region;
     结果表明:1孤立型地震性质:震源错动方式简单,应力降高或很高,视应力低或很低,震源区介质非均匀程度低;
短句来源
     2) multiple earthquake (strike-slip) features complex earthquake dislocation mode, low or very low stress drop, high or very high apparent stress and high heterogeneous level of medium in earthquake source region.
     2多震型地震性质:对于走滑断层地震,震源错动方式复杂,应力降低或很低,视应力偏高或很高,震源区介质非均匀程度较高。
短句来源
     After the Tangshan Earthquake of 1976, strain adjustment took place in the earthquake source region by the occurrence of a series of aftershocks.
     1976年唐山地震后,随着一系列余震的发生,震源区进行应变调整。
短句来源
     6. Revealment of differences of deformation field of earthquake source region and its vicinity, and variations of pattern dynamic parameters of crustal deformation field by application of pattern dynamic method.
     (6)根据图象动力学方法,揭示了近源区与震源区形变场的差异及地壳形变场图象动力参量的变化。
短句来源
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  “earthquake source region”译为未确定词的双语例句
     Based on the concept of information field of earthquake precursors, using the method of the spatial linearity to calculate the geomagnetism data of Z direction we can find the precursory characteristic value-spatial linearity short-term abnormal characteristic value (α), which describes the earthquake source region in the process of earthquake preparation.
     从地震前兆信息"场"的概念出发,利用空间线性度方法对华北地区强震前多台地磁Z值观测资料进行组合计算,得到描述孕震过程中前兆场的特征量空间线性度α。
短句来源
     The results indicate that the value of tectonic ambient shear stress and apparent stress not only reflects strong or weak stress background in earthquake source region but also the information of stress background around earthquake generating area in special tectonic position,namely the small earthquake in seismic window of "seismic activity point" farther from the future strong earthquake epicenter. The difference of the stress state is distinct before and after moderately strong earthquake in East China region.
     结果表明,环境应力值和视应力值不仅能反映震“源”区的应力背景强弱,在距未来强震震中比较远的特殊构造部位,即素有“地震活动穴位”的地震窗口的小地震,同样能较客观反映出孕震区附近应力环境的信息,在华东中强地震前后应力状态的差异性是显著的。
短句来源
  相似匹配句对
     EARTHQUAKE MAGNITUDE WITH SOURCE CHARACTER
     震级与震源特征
短句来源
     Understanding Earthquake Source Radiation
     论震源辐射问题(英文)
短句来源
     EARTHQUAKE
     日本防震与大地震
短句来源
     Earthquake
     地震
短句来源
     Analysis on Uncertainty Factors of Potential Earthquake Source Region
     潜在震源区不确定性因素分析
短句来源
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  earthquake source region
This low-frequency earthquake source region, in which no high-frequency events occurred, may be the steam zone within the actual vent of Ruapehu Volcano.
      
Therigidity describes how hard it is to bendthe rocks in the earthquake source region with a shearing motion.
      
It is further observed that in all the sections the velocity variation shows almost a layered structure, away from the earthquake source region.
      


The numerical theory of the three-dimensional electromagnetic induction is a powerful tool in studying the seismo-magnetic induction effect, as well as the lateral inhomogeneity of the electrical structure in the earth's crust and upper mantle. The complete numerical equations were established in our preceding paper[1]. In this paper we first show both theoretically and numerically the uniqueness, convergency and stability of the solution of these equations under definite conditions. Secondly, some model calculations...

The numerical theory of the three-dimensional electromagnetic induction is a powerful tool in studying the seismo-magnetic induction effect, as well as the lateral inhomogeneity of the electrical structure in the earth's crust and upper mantle. The complete numerical equations were established in our preceding paper[1]. In this paper we first show both theoretically and numerically the uniqueness, convergency and stability of the solution of these equations under definite conditions. Secondly, some model calculations are carried out for various periods of source field and burying depths of local anomalous bodies to study the space-distribution and frequency characteristics of the seismomagnetic induction effect. Under the assumptions that the dimension of the anomalous body corresponds approximately to the source dimension of an earthquake of magnitude 5-7, and that its conductivity is ten times as large as the normal value, the results for source period of a few seconds to a few minutes show that the largest anomaly, relative variation about 30%, of the horizontal component takes place in the central part above the anomalous body, and that the largest anomaly, relative variation 50%, of the vertical component takes place at the two sides perpendicular to the direction of the source field. Therefore, observing the anomalies of short period variations of the field might be a promising approach to monitoring conductivity variations associated with earthquake process. The anomalous intensity of the seismo-magnetic effect, however, decreases quite rapidly with distance, so that the observing sites have to be near the earthquake source region; and this brings about the difficulty for their arrangement in advance.

本文是“地震的感应磁效应(一)——三维电磁感应的数值理论”一文的继续。首先从理论和实际计算两个方面证明了三维电磁感应数值方程解的唯一性、收敛性和稳定性,从而充实了作为研究地壳、上地幔电性结构横向不均匀性理论基础的“三维数值方法”。作为这一理论方法的实际应用,文中对不同源场周期和具有不同埋藏深度的三维电导率异常体进行了模拟计算,以研究地震感应磁效应的大小、空间分布特征和频率特性。模拟计算结果表明,对于周期从数秒到数分钟的地磁短周期变化,若电导率异常体的线度与5至7级地震的震源体积大体相当,其电导率较原背景电导率高近一个量级,其感应磁效应主要特征为:在异常体正上方,地面磁场的水平分量变化最大,相对变化量约30%;在异常体于源场方向一致的两侧,垂直分量变化最大,相对变化量约40—50%。因此,观测短周期地磁场的异常变化,有可能是监测地震孕育过程地下电性变化的一种试验途径。但由于上述异常强度在空间上衰减迅速,所以观测必须接近震源区,这对测点的选择是个不利的因素。

After the Tangshan Earthquake of 1976, strain adjustment took place in the earthquake source region by the occurrence of a series of aftershocks. The relative strain changes in the earthquake source region may be calculated from the energies of the aftershocks by the Benioff's formula. On the whole, these changes are consistent with those obtained from the vertical deformation observed at a geodetic levelling point within the earthquake region. The correlation between the variations of...

After the Tangshan Earthquake of 1976, strain adjustment took place in the earthquake source region by the occurrence of a series of aftershocks. The relative strain changes in the earthquake source region may be calculated from the energies of the aftershocks by the Benioff's formula. On the whole, these changes are consistent with those obtained from the vertical deformation observed at a geodetic levelling point within the earthquake region. The correlation between the variations of the radon content in water and the changes of relative strain is rather good. Further discussion based on such observations suggests that the increase in radon content in water after the main shock may be related to the strain adjustment in the earthquake source region and the cumulative increase of macroscopic fractures of the water bearing rock formations.

1976年唐山地震后,随着一系列余震的发生,震源区进行应变调整。根据贝尼奧夫公式,可由唐山地震序列求出震源区相对应变变化过程。此过程与震源区内一水准观测点所测的垂直形变相对变化基本一致。震源区内水氡的变化与相对应变相关。据此相关性进一步讨论提出,震源区內水氡在主震后的上升可能与震源区应变调整、含水岩层宏观裂隙累积增长有关。

In recent years, in the region around the cities of Beijing and Tianjin, work of seismic deep sounding has been carried out. The purpose is principally for studying the structure of the crust and upper mantle which involves the earthquake source regions of this seismically active portion of the North China Plain. By observing wide angle reflected waves, the reflection PM from the Mohorovicic Discontinuity and PM from the intermediate layer within the crust are recorded. Eefracted waves from the Mohorovicic...

In recent years, in the region around the cities of Beijing and Tianjin, work of seismic deep sounding has been carried out. The purpose is principally for studying the structure of the crust and upper mantle which involves the earthquake source regions of this seismically active portion of the North China Plain. By observing wide angle reflected waves, the reflection PM from the Mohorovicic Discontinuity and PM from the intermediate layer within the crust are recorded. Eefracted waves from the Mohorovicic Discontinuity have been observed. Assuming a horizontally homogeneous layered structural model, computations of the velocity structure by the damped least square method of inversion were done. Eesults show that apparently, in this entire region velocity varies with depth, as a layered earth. On the other hand, horizontal inhomogenuity actually exists.

近几年来,京津及其外围地区开展了地震测深工作。其目的主要是研究地震监视区和震源区的地壳和上地幔结构。用点测深方法观测宽角度反射波;莫霍界面反射波P_M、壳内中间层P_C反射波组,以及结晶基底首波P_8与莫霍界面折射波P_N。选用水平均匀分层介质地壳结构模式,应用阻尼最小二乘法反演速度结构。结果表明,该区速度随深度有较明显的成层分布规律,同时也说明该区速度横向不均匀性是存在的。

 
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