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Choosing the size of chooses
the stiffness of the curve that connects regions of good data.
Our first test cases gave solutions
that we interpreted to be
too stiff at early times and too flexible at later times.
This leads to two possible ways to deal with the problem.
One way modifies the model shaping
and the other modifies the data fitting.
The program below weakens the data fitting weight with time.
This has the same effect as stiffening the model shaping with time.
**clapp
**

Figure 1
Raw CMP gather (left),
Semblance scan (middle),
and semblance value used for weighting function (right).
(Clapp)

**stiff
**

Figure 2
Observed RMS velocity
and that predicted by a stiff model with
. (Clapp)

**flex
**

Figure 3
Observed RMS velocity
and that predicted by a flexible model with
(Clapp)

vrms2intConverting RMS to interval velocity

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Stanford Exploration Project

4/27/2004