Migration velocity is the key factor which influences the migration result.
偏移速度是影响偏移效果的关键因素。
As to migration velocity analysis, it is suggested to start with a little higher initial velocity.
在偏移速度分析中，从稍大的速度开始分析会对速度分析更加有利。
We analyze theoretically the existence of precursor anomaly migration and the nonlinear variation of migration velocity.
从理论上对前兆异常迁移性的存在与迁移速率的非线性变化进行了分析。
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