# Translations:Dictionary:Fig T-1/2/en

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FIG. T-1.
**Tau-**** p** (

**τ**-

*p***) mapping**.

**(a)**An end-on seismic record is

*f*(

*x*,

*t*) where

*x*=source-geophone distance (offset) and

*t*=arrival time.

**(b)**Its tau-p transform is

*F*(τ,

*p*) where

*p*=

*dt*/

*dx*=1/

*V*

_{a}and τ=intercept time at

*x*=0. The reciprocal of the apparent velocity,

*p*, is called

**slowness**. Hyperbolic reflections transform into ellipses, straight events into points (the direct wave into

*P*

_{1}, the head wave into

*P*

_{2}).