Seismic measurements of travel time and amplitude define the subsurface geometry and give estimates of the acoustic impedances related to rock velocities and densities.
如果我们测得地震波的走时和振幅，我们就能够确定地下的几何形状并估算与岩石速率和密度有关的声阻抗。
GABWIT is a software of inversion for 3d crustal velocity structure using seismic body travel time data and genetic algorithms.
GABWIT是应用地震体波走时资料、遗传算法反演地壳三维速度结构的软件。
This paper, using the least travel time and SIRT method, study on the seismic tomography of stress abnormal in coal field. These have some theoretical and practical values.
该文采用最小旅行时和SIRT法，对煤田中的地应力异常地震层析成像的方法进行成像研究，具有一定的理论价值和现实意义。
Alarms can go out before the shaking starts because there is a lag between the time it takes for different seismic waves to travel to the surface.
警报之所以能早于地震发出是因为不同的地震波传到地面有时间差。
The optimal estimate problem of multichannel seismic signals is investigated, and then the fitting of reflection travel-time distance relationship segment is applied and discussed.
研究了多道地震信号的最佳估计以及因之而提出的反射波时距曲线段的拟合问题；
The optimal estimate problem of multichannel seismic signals is investigated, and then the fitting of reflection travel-time distance relationship segment is applied and discussed.
研究了多道地震信号的最佳估计以及因之而提出的反射波时距曲线段的拟合问题；
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