地震级别是根据某一时期震动图记录的地震波振幅的对数值计算的。

The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded on a seismogram at a certain period.

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在影响地震波振幅的诸多因素中，除反射系数外，最主要的是波前扩散和吸收的影响。

Among various factors affecting the amplitude of seismic record, wavefront divergence and absorption are the key ones, except reflected coefficients.

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以往利用地震波振幅值预测储层厚度，遇到储层厚度横向变化大的情况时，预测精度往往会降低。

In the past, reservoir thickness prediction is done by seismic wave amplitude value. But whenever the reservoir thickness horizontally changed rather large, the prediction accuracy often reduced.

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