Accession Number : AD0714112

Title :   Post-Doctoral Program in Seismology.

Descriptive Note : Annual rept. 1 Jul 68-30 Jun 69,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF EARTH AND PLANETARY SCIENCES

Personal Author(s) : Press,Frank ; Toksoz,M. Nafi ; Aki,Keiti ; Green,Paul E. , Jr. ; Kelly,Edward J. , Jr

Report Date : 30 JUN 1969

Pagination or Media Count : 164

Abstract : During the year reported on here, research has been carried out on the generation of seismic waves by earthquakes and explosions, the mathematical theory of body wave propagation, and the structure and dynamical properties of the upper mantle. The spectra of surface waves generated by earthquakes and underground nuclear explosions have been studied, using the Large Aperture Seismic Array (LASA) in Montana and the M.I.T. tiltmeter. Wave number spectra measured using LASA show a null for periods near 50 sec. for NTS explosions, but not for earthquakes. Shear waves generated by large underground explosions at the Nevada Test Site have been used to estimate the magnitude of tectonic strain release accompanying the explosions. Several studies have been carried out on the propagation of body waves through inhomogeneous media. (Author)

Descriptors :   (*SEISMOLOGY, REVIEWS), (*UNDERGROUND EXPLOSIONS, DETECTION), EARTHQUAKES, NUCLEAR EXPLOSIONS, SEISMOMETERS, NETWORKS, POWER SPECTRA, SEISMOLOGICAL STATIONS, INTEGRAL TRANSFORMS, RAYLEIGH WAVES, STRATIGRAPHY, LITHOSPHERE, HEAT FLOW

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE