Environmental and Exploration Geophysics II Pitfalls in Seismic Interpretation (Part 2) & more work on your term projects tom.h.wilson tom.wilson@mail.wvu.edu Department of Geology and Geography West Virginia University Morgantown, WV Tom Wilson, Department of Geology and Geography

“Static” anomalies Tucker and Yorston Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Flat Reflector Apparent structural features are related to variations in thickness of near-surface low-velocity weathered layer. Tom Wilson, Department of Geology and Geography

Apparent low in the time structure Tom Wilson, Department of Geology and Geography

Low to southwest also observed in pre-stack depth converted seismic Tom Wilson, Department of Geology and Geography

Note that the lows tend to be concentrated in the valleys Tom Wilson, Department of Geology and Geography

We actually have a structural high in this area Tom Wilson, Department of Geology and Geography

Note that the lows tend to be concentrated in the valleys Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Velocity usually increases with Depth Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Increased thickness of the high velocity carbonate Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

A Velocity Pitfall? Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Erosional Truncation? Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tucker and Yorston Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography Tucker and Yorston

Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography

Tom Wilson, Department of Geology and Geography

To Do Read through pages 229 to 232 (static corrections) and look over problem 4.14 Look over the velocity analysis pitfalls exercise handed out today Bring questions to class on Monday Tom Wilson, Department of Geology and Geography