Technical report for the period 1 July - 30 September 1986 on Contract MDA903-84-C-0020

Technical Report · Sat Nov 01 04:00:00 EST 1986

OSTI ID:6531154

Israelsson, H; Jurkevics, A; Dysart, P; Pulli, J; Tiberio, M

Work on seismic network design and capability assessment focused on network design concepts and capability estimates, based on analysis of networks of the approximate size and complexity. Results of this analysis quantified effects on detection threshold as a function of network size and distribution, identified sources of epicenter location errors and led to an approach for establishing network characteristics required for confident use of pP for focal-depth determination. Research to improve analysis of regional seismic data used recordings from the NORESS array. Polarization analysis was extended to an array of three-component sensors, and the value of polarization parameters in an automated routine to identify regional phases was demonstrated . A study of tradeoffs between seismic source spectra and absorption showed the extreme sensitivity of inferred Q to assumptions about the source. Various parameters determined in autoregressive analysis of earthquakes and explosions recorded at NORESS, and a physical interpretation of these parameters, indicated the usefulness of these parameters for event identification. A major reconfiguration and upgrade of the Center's computer system during this quarter included installation of a new Sun system dedicated to processing on line NORESS data, and fabrication of a data authenticator for this system. Problems with NORESS data quality and loss of data required substantial debugging efforts but now appear to be under control. The VAX machine used for classified computing was replaced with a Sun 3/160.

• Research Organization: Science Applications International Corp., Arlington, VA (USA)
• OSTI ID: 6531154
• Report Number(s): AD-A-177323/3/XAB; SAIC-86/1994
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450300* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosion Detection
58 GEOSCIENCES
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
ABSORPTION
ATTENUATION
AUTOMATION
COMPUTERS
DATA PROCESSING
DETECTION
EARTHQUAKES
EPICENTERS
ERRORS
EXPLOSIONS
MATHEMATICS
MEASURING INSTRUMENTS
MONITORING
NUCLEAR EXPLOSION DETECTION
POLARIZATION
PROCESSING
REGRESSION ANALYSIS
SEISMIC ARRAYS
SEISMIC DETECTION
SEISMIC EVENTS
SENSITIVITY
STATISTICS