Accession Number : ADP204519

Title :   Modeling Hydroacoustic Propagation for Seismic Events,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA INST OF GEOPHYSICS AND PLANET ARY PHYSICS

Personal Author(s) : DE Groot-Hedlin, Catherine ; Orcutt, John A.

PDF Url : ADP204519

Report Date : 14 AUG 1995

Pagination or Media Count : 7

Abstract : The goal of our research is to understand how acoustic energy from underwater earthquakes is coupled to the sound channel and how the sound is propagated from the source to the hydrophone receivers. We intend to compare results from numerical modeling of long-range acoustic propagation to hydroacoustic data. A large suite of hydroacoustic data will be assembled, in order to obtain optimal azimuthal coverage from source to receiver, as well as a wide range of source depths and source parameters. The numerical modeling will involve integrating bathymetric and sound speed databases into the models since sound propagation in the oceans is strongly dependent upon these parameters. Our object is to be able to distinguish between source effects and propagation effects. We have conducted some simple numerical modeling experiments to compare hydroacoustic signatures for models with and without significant bathymetric interaction along the transmission path. The acoustic wavefield is computed using the parabolic equation method for a large number of frequencies within the band of interest; time domain arrivals are computed by Fourier synthesis of these calculations.

Descriptors :   *ACOUSTIC DETECTION, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, *EARTHQUAKES, *UNDERWATER ACOUSTICS, SYMPOSIA, VERIFICATION, MONITORING, ACOUSTIC WAVES, BATHYMETRY, WAVE PROPAGATION, ACOUSTIC ARRAYS, SOUND TRANSMISSION, HYDROPHONES, ACOUSTIC SIGNATURES, TREATIES, ACOUSTIC VELOCITY, FOURIER ANALYSIS.

Subject Categories : Government and Political Science
      Seismology
      Acoustic Detection and Detectors
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE