Accession Number:

ADA235569

Title:

Effects of a Descending Lithospheric Slab on Yield Estimates of Underground Nuclear Tests

Descriptive Note:

Final technical rept. 8 Mar 1988-31 Aug 1990

Corporate Author:

CONNECTICUT UNIV STORRS DEPT OF GEOLOGY AND GEOPHYSICS

Personal Author(s):

• Cormier, Vernon F.
• Kim, Woohan
• Mandal, Batakrishna
• Harvey, Danny

Report Date:

1991-02-01

Pagination or Media Count:

118.0

Abstract:

A method for computing seismic wavefields in a high-frequency approximation is proposed based on the integration of the kinematic ray tracing equations and a new set of differential equations for the dynamic properties of the wavefront, which we call the vicinity ray tracing VRT equations. These equations are directly obtained from the Hamiltonian in ray centered coordinates, using no paraxial approximations. This system is comparable to the standard dynamic ray tracing DRT system, but it is specified by fewer equations four versus eight in 3-D and only requires the specification of velocity and its first spacial derivative along a ray. The VRT equations describe the trajectory of a ray in ray centered coordinates of a reference ray. Quantities obtained from vicinity ray tracing can be used to determine wavefront curvature, geometric spreading, travel time to a receiver near the reference ray, and the KMAH index of the reference ray with greater numerical precision than is possible by differencing kinematically traced rays. Since second spatial derivatives of velocity are not required by the new technique, parameterization of the medium is simplified, and reflection and transmission of beams can be calculated by applying Snells law to both vicinity and central rays. Conversation relations between VRT and DRT can be used to determine the paraxial vicinity of DRT, in which the errors of the paraxial approximations of DRT remain small. Because no paraxial approximations are made, the superposition of the Gaussian beams define from the vicinity rays should exhibit a much slower breakdown in accuracy as the scale length of the medium given by VDelta v approaches the beamwidth.

Descriptors:

• *YIELD(NUCLEAR EXPLOSIONS)
• *SEISMIC DISCRIMINATION
• *SEISMIC DETECTION
• SPECIFICATIONS
• UNDERGROUND EXPLOSIONS
• NUCLEAR EXPLOSION TESTING
• CURVATURE
• SNELLS LAW
• DIFFERENTIAL EQUATIONS
• EQUATIONS
• TRAJECTORIES
• RAY TRACING
• WAVEFRONTS
• TRAVEL TIME
• HAMILTONIAN FUNCTIONS
• LITHOSPHERE
• HIGH FREQUENCY
• SPATIAL DISTRIBUTION
• KINEMATICS
• COORDINATES

Subject Categories:

• Seismic Detection and Detectors
• Nuclear Weapons

Distribution Statement:

APPROVED FOR PUBLIC RELEASE