* Reflection tomography *

Here are two different expanded abstracts
from the 1991 SEG annual convention:
[[seg1991depth1.pdf]] [[seg1991depth2.pdf]]

Here's a manuscript (unpublished)
[[reflection_tomo/]] explaining a method of
reflection tomography after depth migration.

For example, A plot [[tomoin.gif]] of picked
zero-offset reflection times (black lines)
and of picked prestack stacking "velocities"
(in color) describe the change in prestack
times with offset.  This interval velocity
model [[tomoout.gif]], in depth, was
estimated from the picked traveltime
information.  Lines show the estimated
locations of picked reflections in depth.

* Amplitude tomography *

This paper [[seg1994amp.pdf]] from the 1994
SEG convention in Los Angeles, explains an
application of amplitude tomography to
surface seismic data.

Here are the original figures.  [[seg94a/]]

* Diving wave tomography *

Here is a method to solve 3D anisotropic
diving wave tomography [[divingtomo.pdf]].

See an example of input first-arrival times
[[divein.gif]] from the Husky Canadian
Foothills dataset and the output velocity
model [[diveout.gif]] with sample raypaths,
estimated by diving wave tomography.  Input
station numbers are 20m apart.
Surface-consistent static shifts were also
estimated, but negligible in this case.
Smooth near-surface velocity changes were
able to model and explain all first arrival
times well.

* Crosswell tomography *

Here is an expanded abstract using wavepaths
presented at the 1990 SEG annual convention:
[[seg1990wave.pdf]]

Interval velocities [[xwell.gif]] were
inverted from first-arrival times between
four wells.  Sample raypaths are included.
The wells are not coplanar.