TITLE:

EFFICIENT TECHNIQUES FOR WAVE PROPAGATION IN HETEROGENEOUS MEDIA (No. 59)

DATE:

Friday, November 19th, 2004

TIME:

3:30 PM

LOCATION:

GMCS 214

SPEAKER:

Michael D. Collins, Naval Research Laboratory, Washington, D.C.

ABSTRACT:

Many wave propagation problems in geophysics are too complicated to be solved exactly and too large to be solved directly with numerical methods. Fortunately, there exists an approach for obtaining approximate solutions that can be obtained efficiently with no significant loss in accuracy. Lateral variations in the medium are often gradual in problems in ocean acoustics, seismology, and atmospheric waves. In this case, an elliptic wave equation can be approximated by a parabolic wave equation, which accounts for energy that propagates away from a source but ignores back scattering. This approach provides accurate solutions for many problems in geophysics. The basic ideas and applications will be discussed.

HOST:

Jose Castillo

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