Accession Number:

ADA021744

Title:

Investigations of Tectonic Stress, Applied Relaxation-Source Theory to Earthquake-Explosion Discrimination

Descriptive Note:

Final rept. 1 Nov 1973-31 Aug 1975

Corporate Author:

COLORADO UNIV AT BOULDER

Personal Author(s):

• Archambeau, Charles B.

Report Date:

1975-08-15

Pagination or Media Count:

184.0

Abstract:

Results relating to the analytical modeling of earthquakes by relaxation-source theory models are summarized. Applications to explosion- earthquake discrimination and earthquake source parameter estimation, particularly tectonic stress determinations, are discussed in detail. The theoretical work summarized includes generalized representation theorems, energy considerations, equivalence theory, radiation field solutions for relaxation models of earthquakes, computer based earthquake field simulation, predictions of m sub b - M sub s relations for earthquakes and explosions, and comparisons of relaxation source theory results with results from numerical models of earthquakes. Further, the theoretical basis for m sub b - M sub s discrimination and discrimination using spectral magnitude parameters is discussed in detail. Comparative studies undertaken, involving observed data for earthquakes, include comparisons of relaxation theory spectra to observations of earthquake spectra in the near field distance range with associated inference of source properties, and modeling of the static field using numerical dislocation and relaxation models in order to infer failure conditions and prestress fields.

Descriptors:

• *EARTHQUAKES
• *SEISMIC DETECTION
• *UNDERGROUND EXPLOSIONS
• CORRELATION TECHNIQUES
• INTENSITY
• MATHEMATICAL MODELS
• NEAR FIELD
• NUCLEAR EXPLOSIONS
• POWER SPECTRA
• RAYLEIGH WAVES
• SEISMIC DATA
• SEISMIC WAVES
• SIMULATION
• SOURCES
• STRESSES
• STRUCTURAL GEOLOGY
• TECTONICS
• THEOREMS

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE