## 2aUW7. Modeling the effects of shear conversion on low grazing angle bottom penetration.

### Session: Tuesday Morning, May 14

### Time: 10:20

**Author: Stanley A. Chin-Bing**

**Location: Naval Res. Lab., Stennis Space Center, MS 39529-5004**

**Author: Joseph E. Murphy**

**Location: Univ. of New Orleans, New Orleans, LA 70148**

**Abstract:**

Modeling shear conversion with finite-element/finite-difference codes at a
kilohertz and above is difficult due to the number of computational elements
needed for such small wavelengths. Typically six to ten nodes per wavelength are
required to attain good accuracy. Thus, a typical shallow-water two-dimensional
scenario can require hundreds of thousands of computational elements. In this
model study, a brute-force hybrid approach is applied. The computational
resources of supercomputers with large memories are combined with hybrid
modeling techniques to produce simulations of compressional/shear-wave
conversions at low grazing angles over range-dependent bathymetry. Examples will
be presented that illustrate the effects of these conversions in both
horizontally stratified and inhomogeneous anelastic ocean bottoms. [Work
supported by ONR/NRL and by High Performance Computing grants.]

from ASA 131st Meeting, Indianapolis, May 1996