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。
As to migration velocity analysis, it is suggested to start with a little higher initial velocity.
相干谱在剩余曲率偏移速度分析中，是判别速度是否正确以及求取速度更新量的重要工具。
Semblance spectrum is the important tool to judge whether the migration velocity is correct or not and obtain the velocity update amount in residual curvature migration velocity analysis.
偏移速度分析是叠前深度偏移的关键步骤之一，它的准确与否直接影响叠前深度偏移的质量。
Migration velocity analysis is one of the key steps in pre stack depth migration whose accuracy directly affects the quality of pre stack depth migration.
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