Accession Number:

ADA446517

Title:

Infrasound Modeling Using Soviet Explosion Data and Instrument Design Criteria from Experiments and Simulations

Descriptive Note:

Technical rept. 27 Sep 1997-31 Dec 2000

Corporate Author:

TITAN CORP SAN LEANDRO CA PULSE SCIENCES DIV

Report Date:

2006-02-01

Pagination or Media Count:

70.0

Abstract:

This report covers two major topics evaluation of International Monitoring System IMS network performance using data from historic Soviet nuclear tests and analysis of infrasound instrumentation design. The Institute for the Dynamics of the Geospheres has digitized 220 infrasound waveforms from 22 atmospheric nuclear tests conducted in 1961. We compare measurements from this data set with infrasound scaling and attenuation relations and find best agreement with a relation developed by Los Alamos National Laboratory. We estimate that the IMS detection threshold is approximately one kiloton worldwide, but higher in broad ocean areas and lower in continental regions. Network simulations would be improved by including the non-Gaussian character of infrasound noise distributions. Infrasound recording instruments use an array of pipes connected to a central manifold to spatially filter random pressure fluctuations and enhance the signal-to-noise ratio SIN. We present a rapid, accurate method of estimating any pipe configurations response, and calculate the response of proposed MS pipe configurations. The most important design criterion for enhancing SIN is sufficient spatial sampling, which is improved with larger pipe array dimensions. Open-ended pipes are preferable because they have flatter phase responses, and they have flat amplitude responses, while closed ended pipes act as lowpass filters.

Subject Categories:

  • Acoustic Detection and Detectors
  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE