## moveout

## moveout

**moveout ( stepout)**

**1.**The difference between the two-way travel times of reflected energy detected at two geophone offset distances.

**2.**(

**normal moveout**,

**NMO**,

**) At an offset distance**

*ΔT**x*, the difference in two-way travel time between the detected reflection event at

*x*(

*t*

_{x}) and at zero offset (

*t*

_{0}), such that Δ

*T*=

*t*

_{x}−

*t*

_{0}≈ x

^{2}/(2

*V*

^{2}

*t*

_{0}), where

*V*is the seismic velocity of the medium above the reflector.

**3.**(

**dip moveout**,

**DMO**,

**Δ**) In the case of a planar dipping reflector, the difference between the moveout up-dip and down-dip, proportional to the angle of dip ɵ, such that: Δ

*T*_{d}*T*

_{d}= 2χsin ɵ/

*V*, where χ is the offset distance from the mid-point.

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