地震波

It is turns out that the average seismic apparent stress calculated with seismic magnitude in Chinese mainland is similar to that calculated with digital seismic wave data and the distribution is coincident with each other.

研究表明：利用地震震级计算的中国大陆地震视应力大小与利用数字地震波资料测定结果相差不大，其空间分布基本一致。

Through numerical calculation and comparison with the complete formula,the accuracy of the approximate formula for calculation of reflection coefficient often used in AVA method for gas hydrate is discussed.

通过与完整公式的对比，对AVA常用的反射系数近似计算式的精度进行了讨论，同时分析了地震波速度、泊松比、密度等参数对于BSR反射系数的不同贡献。

In this paper the theory and computation of finite element method is discussed for solving seismic response in anisotropic viscoelastic media, the relations between the attenuation factor and viscosity are presented.

本文论述准各向异性粘弹波动方程有限元数值解地震波响应的原理与计算方法，并给出地震衰减因子与方程中粘滞系数的计算关系式。

If the number of the second kind of damping element is comparatively less than the number of the whole structure element, its calculating efficiency will be higher.

据此，对这类结构作者编制了空间动力时程线弹性分析程序，验证分析程序的可靠性之后，对这类结构在地震波的作用下，按实际阻尼比、等效阻尼比、单一阻尼比等情况进行了三维弹性动力时程计算，分析在不同情况下的反应差别，比较三者的差异发现后两者计算结果用于设计或者造成浪费或者造成不安全，最后提出在设计中应该注意的问题及建议。

When the Chilean earthquake occurred in 1960, seismographs recorded seismic waves that traveled all around the Earth .

当智利地震发生在1960年，地震仪记录的地震波说，走过的所有环绕地球。

After the analysis results of every earthquake wave were required, an empirical equation, which was used to evaluate the translation frequency of damping coefficient in the time domain about hysteretic damping, was established.

提出了"阻尼系数转换频率"的概念，并利用实际地震波的分析结果，进行回归分析，得到一个阻尼系数转换频率取值的经验公式。

AVO analysis is suggested for solving to solve the difficulty in identification of thin alternating layers in exploration of oilfields. It can improve the current method that has no thickness variable in the formula of reflective and is limited by sampling rates in calculation of the coefficient in the time of domain. Using the relationship of stress and displacement on two interfaces, this paper derives the spectrum of reflective coefficient for any incidence angle and thiekness of thim layer based on the equation of seismic wave propagation in the frequency domain.

针对油气田开发中薄互层认识难的问题，提出从AVO分析解决困难，克服现有方法在反射系数公式中无厚度变量、时间域计算反射系数谱受采样率限制的不足，运用两个界面间位移与应力关系，从频率域地震波传播方程推导了任意入射角和薄层厚度下的反射系数谱。

The self-mixing effect of laser diode including the self-mixing model, the problem offeedback coefficient, measure principle was studied. The characteristic of theVCSELs seismic acquisition system was studied by experiments.

讨论LD自混合效应的原理，包括自混合的模型、反馈系数问题和测量原理；之后讨论了VCSELs的调制特性，通过实验研究了VCSELs地震波测量系统的特性。

Discussion on Standard of Critical Angle of Seismic Wave in Seismic Analysis of Complicated Structure.

复杂结构地震波输入最不利方向标准问题。

The methods for treatment of earthquake input and modeling of radiation damping in infinite foundation were established based on cylindrical wave equation.

其中，地震波的输入方法以及无限地基辐射阻尼的模拟方法都是在柱面波动方程的基础上建立起来的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。