Accession Number:

ADA279483

Title:

Investigations of Joint Seismic and Electromagnetic Methods for Nuclear Test Monitoring

Descriptive Note:

Final rept. Sep 1990-Dec 1993

Corporate Author:

COLORADO UNIV AT BOULDER DEPT OF PHYSICS

Personal Author(s):

• Archambeau, Charles B.
• Davies, John B.
• Orrey, Jeffrey L.

Report Date:

1993-12-31

Pagination or Media Count:

77.0

Abstract:

This study is designed to develop both linear and non-linear modeling methods for prediction of excitation of atmospheric and seismic disturbances from near surface explosions and earthquake sources in complex media which include strong lateral variability, randomness and non-linear response effects. Comparisons with observations are systematically pursued to evaluate these models and to develop source discrimination methods. In this report we describe examples of non-linear atmospheric excitation by near surface explosions which are carried to ionospheric heights in order to predict fluctuations in ionospheric electron densities and ionization layer positions. These predictions are compared to active EM monitoring by ground stations of ionospheric layer perturbations due to the large amplitude atmospheric waves from surface explosions. We also consider atmospheric turbulent coupling at the earths free surface and investigate the high frequency seismic noise characteristics resulting from this source using combined seismic and atmospheric modeling. Discrimination of seismic sources, Atmospheric modeling, Seismic waves, Ionospheric waves, 3-D Modeling, Seismic noise.

Descriptors:

• *ELECTROMAGNETIC WAVE PROPAGATION
• *SEISMIC WAVES
• *SEISMIC DISCRIMINATION
• SIGNAL PROCESSING
• SURFACE ANALYSIS
• MONITORING
• LAYERS
• EXCITATION
• NUCLEAR EXPLOSION TESTING
• IONIZATION
• IONOSPHERIC DISTURBANCES
• GROUND STATIONS
• LOW FREQUENCY
• AMPLITUDE
• EARTHQUAKES
• MATHEMATICAL PREDICTION
• THREE DIMENSIONAL
• ELECTRON DENSITY
• COMPARISON
• OBSERVATION
• SIGNAL TO NOISE RATIO
• UNDERGROUND EXPLOSIONS

Subject Categories:

• Magnetic and Electric Field Detection and Detectors
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE