有限差分时间偏移：finite difference time migration 有限差分深度偏移：finite-difference depth migration 有限差分偏移：Finite difference migration ..
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The finite difference depth migration equation in space-frequency domain can be derived when the radical expression is approximated by continued fraction.
采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。
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