地震记录的

Finally,the two-step MP algorithm was applied to spectral decomposition of field data,meanwhile,based on the slices of different frequency,the gas shadow phenomenon below gas-bearing reservoir was analyzed,the results show that shadow phenomenon can directly indicate the existence of hydrocarbon.

在某地区，利用两步法MP快速算法对实际地震记录进行了谱分解，并基于由谱分解得到的不同频率的切片，分析了含气储层下方的影子效应，结果表明影子效应直接指示了烃类的存在。

Every link of source shot, wave spread, geophone receiving and seismic recording all has influence to the data fidelity.

震源的激发、波的传播、检波器的接收和仪器记录各个环节对地震信息的保真度都有影响。

First of all, the report introduced evolution, achievments and problems in the study of anisotropy in the inner of earth. The first-order hyperbolic system of equations is work out, which is used to describe the wave motion in 2D transversely isotropic media. Utilizing the characteristics of free-divergence, We have imposed MacCormack theme that is used to simulate multicomponent records in anisotropic media and have developed a fast high order vectorized finite-difference algorithm adapted for the vector supercomputer.

本文首先阐述了地球内部介质各向异性研究的沿革、成就和问题，接着给出了描述二维横向各向同性介质中波动的一阶双曲型方程，利用其自由发散特性，构制了各向异性介质中多波多分量地震记录数值模拟的MacCormack算式，导出了适用于并行计算的二维横向各向同性介质中波动的有限差分模拟算子，该算子具有可并行化计算、相位差小等优点。

The stability of algorithm, the condition of absorbing boundary and free surface boundary, the grid dispersion and the process of source are discussed in details. The numerous simulations of wave propagation are carried out in isotropic media, transversely isotropic media and anisotropic media induced by fractures. The difference between anisotropic and isotropic effects on surface records is analysized.

接着讨论了有限差分算子的稳定性和收敛性，以及吸收边界条件、自由边界条件、数值频散和震源的处理，对各向同性介质、横向各向同性介质以及裂隙引起的各向异性介质中传播的弹性波场进行了数值模拟，分析了多波多分量数据中的各向异性效应以及各向同性在地表地震记录中的反映。

The conventional method has the disadvantage of suppressing effective low-frequency signals as well as surface wave.

这种方法的缺点在于压制面波的同时，地震记录上有效的低频信号也受到压制。

When using full wave train logging data to make C wave synthetic seismogram,it needs to consider the influence of many kinds of factors such as dip and anisotropy of bed as well as environment correction of S wave logging data etc.

采用全波列测井资料制作转换波人工合成地震记录，需要考虑地层倾角、岩层各向异性、横波测井资料的环境校正等多种因素的影响；在纵、横波资料对比中，又需要考虑极性、井资料的深时转换、子波带宽等的影响。

Based on the fact that the different modes of Rayleigh wave have different propagation velocities, the signals of Rayleigh wave which superposes in time domain can be separated in frequency-wave-number domain, different modes of Rayleigh wave are separated and extracted by Fourier transform.

摘 要：应用Fourier变换法分离提取地震记录中不同模态的瑞雷面波，其原理是：利用瑞雷面波各模式传播速度的差异，将时间域中叠加在一起的瑞雷面波信号在频率波数域中分开，以此实现分离提取各阶模态瑞雷面波。

In the seismic records of plane wave source the cavity underneath the roadway shows as a obviously unusual "candied fruit".

利用平面波震源在巷道内激发产生的波场中，巷道下方的空洞在平面波震源激发的地震记录上，其多次反射绕射波互相叠合在一起，表现为&糖葫芦&状的明显异常特征。

The research for near field seisms has had more and more attention.

已有的地震记录表明，含有速度脉冲的近场地面运动往往会具有较大的PGV/PGA比值，进而会在反应谱中产生较宽的加速度敏感区。

Indeed, in the days after the "Big One", Chilean seismometers have recorded more than ten aftershocks in the range 6th to 7th magnitude, and more than two hundred aftershocks stronger than 4th magnitude.

事实上，在大地震过后的几天里，测震仪已经记录下了多余10次位于智利范围内的6到7级的余震，以及多于200次高于4级的余震。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失