地震波

The set of absorbing boundary conditions based on paraxial approximations of 3-D elastic wave equations are applied to the numerical boundaries.

在此基础上进行了三维盐丘地质模型的地震波传播数值模拟试算。

The result shows that large airgun source excited in reservoir environment is rich in low frequencies (0 Hz), and is effective to produce waves with long-offset and deep crustal penetration.

试验结果表明，大容量气枪震源是具有丰富的10Hz以下低频信号的低频震源，其激发的地震波具有传播距离远，穿透深度深的特点。

The present digital water level recording may possibly lose some information,so large earthquake caused abnormal change of water level recorded by analog recording is clearer than that by.

认为：目前的水位模拟记录较数字化记录能更清晰地看到巨大地震引起的水位异常变化过程；大震引起的水位上升和下降可能是地震波的作用改变了构造单元的应力所致，并与井点的地质构造部位有关；同一井孔对同一断层上破裂方式一致的大地震的响应方式是一致的，只是对震级大的地震响应幅度大，震级减小，响应幅度亦减小

Characters of soil or rock、spectrum properties of input wavelets、angle of incidence et al.

场地特性包括地形的特征尺寸如坡度和高度、介质的性质等，输入地震动特性包括输入地震波的频谱特性、入射角度等。

In order to select optimal grid and good computation efficiency to recover the entire signal, aiming at the Ricker wavelet commonly used in forward modeling, we analyzed the alias and signal restoration problem in finite-difference method based on spatial sampling theorem and seismic wave traveling regulation in media with different velocity, to derive quantitative relationship among the modeling grid size, minimum velocity of model layer, and recovered main frequency of wavelet.

为了选择最佳的网格尺寸以及以最小的计算量完整地恢复出信号，针对地震波场正演模拟中经常使用的Ricker子波，根据空间采样定理和地震波在不同速度介质中的传播规律，分析了有限差分算法中的假频和信号恢复问题，推导出模拟网格尺寸、模型地层的最小速度和能够恢复的子波主频之间的近似定量关系，并用数值算例验证了这一关系。

However, due to its strong randomicity, fuzziness and uncertainly, even a problem such as transmission laws of blast vibration waves has not yet been cognized perfectly.

然而，由于爆破地震波强烈的随机性、模糊性和不确定性，即便是爆破地震波的传播规律这样似乎简单的问题也尚未得到完整的认识。

Through analyzing a lot of tested data of seismic waves from deep hole blastings at a different angle, the changing rules and influence factors of such main parameters as frequency, amplitude and lasting time of blasting seismic waves propagating in a rock medium are obtained, and the empiral formulas for calculating the amplitude of blasting seismic wave acceleration are fitted out by binary regression.

通过从不同角度对大量的深孔爆破地震动测试数据的分析，得到了岩石中爆破地震波传播的频率、幅值和持续时间等主要参数的变化规律以及它们的影响因素，并通过二元回归法，拟合出计算爆破地震波加速度幅值的经验公式。

Seismic energy is disturbed and attenuated seriously under the bad geological conditions for seismic exploration in southern Huanghai basin, and therefore the Meso-Paleozoic wave group of marine reflection seismic cannot be recognized and the seismogram does not meet the requirement for evaluation of pre-Tertiary oil/gas resources in southern Huanghai basin. In May 2006, marine magnetotelluric sounding experiment was carried out and reliable data were acquired.

针对南黄海盆地深层地震地质条件差，地震波受屏蔽，能量严重衰减，在海洋反射地震资料中很难识别反映中-古生界的反射地震波组，不能满足南黄海盆地前第三系油气资源前景评价的需要等问题，于2006年5月，开展了南黄海海域海底大地电磁测深试验，在盆地内五莲斜坡和胶州凹陷区布设了3个海底大地电磁测深点，取得了可靠的海底观测数据。

This paper reviewed the definitions of seismic wave scattering,and investigated the characteristics of scattered wave,its differences with reflected wave,and the complex scattering behaviors of metallic ore seismic wave field.

介绍了地震波散射的概念、散射波特征、散射波与反射波的区别等散射波地震方法的基础内容，分析了金属矿地震波场复杂的散射特征。

The main factor that affects the resolution of seismic prospecting is Earth's absorption and attenuation effect on high frequency signals. Study and calculation of Earth's absorption and attenuation effect show that medium deep and deep reflectors over 135 Hz can not be recorded even by 24-bit seismometers.

地震勘探分辨率不高的主要原因是地层对地震波高频成分的吸收衰减，通过对地层吸收衰减深入的理论计算可知，既便使用 2 4位遥测地震仪，在中深层勘探中也无法记录主频超过 13 5Hz的地震波。

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％。