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Earth and Space Sciences · 术语表

什么是 Stacking, root-mean-square and interval velocities？

又称： interval velocity · root-mean-square velocity · stacking velocity

Definition 2.12 University Earth and Space Sciences — Year 3 · 第 2 章 — Exploration Seismology

The interval velocity $v_i$ of a layer is its own speed; with $\Delta t_i = 2h_i/v_i$ the two-way time across it, the root-mean-square velocity down to the base of layer $n$ is

V_{\text{rms},n} = \left(\frac{\sum_{i\le n}v_i^2\,\Delta t_i}{\sum_{i\le n}\Delta t_i}\right)^{1/2}.

The stacking velocity of a reflection is the speed $V$ of the hyperbola $t^2 = t_0^2 + x^2/V^2$ that best fits its times in a CMP gather.

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