Accession Number : AD0695495

Title :   RESEARCH DIRECTED TOWARD THE USE OF LONG AND INTERMEDIATE PERIOD SEISMIC WAVES FOR THE IDENTIFICATION OF SEISMIC SOURCES.

Descriptive Note : Annual technical rept. no. 1, 1 Aug 68-1 Aug 69,

Corporate Author : LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES N Y

Personal Author(s) : Gumper,Frank J.

Report Date : AUG 1969

Pagination or Media Count : 34

Abstract : Seismological research supported by Air Force contract F19(628)-68-C-0341 at the Lamont-Doherty Geological Observatory is summarized for the period 1 August 1968 to 1 August 1969. During this period significant advances haave been made toward the use of long and intermediate period seismic waves for the identification of seismic sources. Our increased understanding of many features of the seismogram has enhanced its utility in detecting and identifying small seismic events. A large network of long and intermediate period instruments has been operated, and new high sensitivity, broad-band, low noise instruments have been developed which have proved especially effective for detecting and discriminating small events. Studies of seismicity and focal mechanisms for several tectonic regions and the attenuation of the Sn phase have provided additional support for the model of the New Global Tectonics. Study of the relative excitation of both body waves and surface waves by earthquakes and explosions have continued to reveal it to be a powerful discriminant between the two sources. The steady development of computer programs has permitted rapid and sophisticated analysis of both conventional and Large Aperture Seismic Array data. Thus, important progress has been made toward detecting and identifying seismic events. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, NOISE), (*UNDERGROUND EXPLOSIONS, DETECTION), MICROSEISMS, EARTHQUAKES, NUCLEAR EXPLOSIONS, SEISMIC WAVES, ATTENUATION, SEISMOMETERS, NETWORKS, POWER SPECTRA, COMPUTER PROGRAMMING, DATA PROCESSING

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE