Accession Number : AD0618275

Title :   SEISMIC DETECTION METHODS FOR UNDERGROUND EXPLOSIONS,

Corporate Author : AIR FORCE TECHNICAL APPLICATIONS CENTER WASHINGTON D C

Personal Author(s) : Romney,Carl

Report Date : 1963

Pagination or Media Count : 15

Abstract : Underground explosions are detectable at long ranges only by recording and analyzing seismic waves. The signals received are highly distorted as a result of multipath propagation dispersion, mode conversion, and scattering. The result is that signals from explosions tend to be similar to those recorded from thousands of small earthquakes which occur each year. The basic detection problem thus becomes one of sorting out suspicious events from the many natural events recorded. No way of identifying explosions by seismic means is now known, but methods of identifying a fair proportion of natural events exist and are being improved. The remaining occurrences in the suspicious category could be identified only if other kinds of information were available. (Author)

Descriptors :   (*UNDERGROUND EXPLOSIONS, DETECTION), SEISMIC WAVES, SEISMOGRAPHS, IDENTIFICATION SYSTEMS, VELOCITY, PROPAGATION, MONITORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE