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。
Seismic measurements of travel time and amplitude define the subsurface geometry and give estimates of the acoustic impedances related to rock velocities and densities.
声学中，速度与密度的乘积就是阻抗，也称为声阻抗或波阻抗，用符号Z表示。
In acoustics, the product of velocity times density, also called acoustic impedance and symbolized by z.
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