Accession Number:

ADA017773

Title:

Improved Yield Determination and Event Identification Research

Descriptive Note:

Quarterly technical rept. 1 May-31 Jul 1975

Corporate Author:

SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA

Personal Author(s):

• Cherry, J. T.
• Rimer, N.
• Savino, J. M.
• Wray, W. O.

Report Date:

1975-08-08

Pagination or Media Count:

34.0

Abstract:

A one-dimensional parameter study which identifies the dependence of teleseismic magnitude on near source material properties was carried out. The major results of the material parameter sensitivity study may be summarized as follows 1 increasing the air-filled porosity greatly reduces seismic coupling 2 if any parameter describing the yield surface is varied such that the material strength is reduced, seismic coupling may be substantially enhanced 3 seismic coupling is relatively insensitive to water content a slight decoupling is observed with increasing water content 4 increasing the overburden pressure substantially reduces seismic coupling. The near field coupling and the equivalent elastic source were computed for the recent underground explosion, Mast, at Pahute Mesa. The next step is to generate synthetic seismograms for this event at recently specified receiver locations. The enhanced computational capabilities for treating realistic earth structures will be exercised in this experiment.

Descriptors:

• *EXPLOSION EFFECTS
• *SEISMIC WAVES
• *UNDERGROUND EXPLOSIONS
• AIR
• COUPLING(INTERACTION)
• DETERMINATION
• ELASTIC PROPERTIES
• EXPERIMENTAL DATA
• GROUND MOTION
• INTENSITY
• MATHEMATICAL MODELS
• MOISTURE CONTENT
• POROSITY
• PRESSURE
• ROCK

Subject Categories:

• Seismology
• Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE