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![]() | Model fitting by least squares | ![]() |
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Imagine a downgoing wavefield . Propagating against irregularities in the medium
creates by scattering an upgoing wavefield
.
Given
and
, if there is a strong temporal correlation between them
at any
it likely means there is a reflector nearby that is
manufacturing
from
.
This reflectivity could be quantified by
.
At the Earth's surface the surface boundary condition says something like
or
. Thus at the surface we have something like
.
As we go down in the Earth, the main difference is that
and
get
time-shifted in opposite directions, so
and
are similar but
for that time difference. Thus, a study of how we handle
is worthwhile.
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![]() | Model fitting by least squares | ![]() |
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