Accession Number:

AD0684169

Title:

RESEARCH IN SEISMIC PHENOMENA CONNECTED WITH EARTHQUAKES AND EXPLOSIONS

Descriptive Note:

Annual rept. 31 Oct 1967-1 Nov 1968

Corporate Author:

CALIFORNIA INST OF TECH PASADENA SEISMOLOGICAL LAB

Report Date:

1968-11-01

Pagination or Media Count:

29.0

Abstract:

The structure of the crust and upper mantle in the Western United States has been intensively studied by refraction and reflection techniques. Strong lateral variations have been found which correlate well with gravity, heat flow, P-delay, and other geophysical data. A method has been developed for analyzing high pressure shock wave data in order to make direct comparisons with seismic data. The lower mantle is clearly enriched in iron compared to the upper mantle. Theoretical work for wave propagation in inhomogeneous media has provided a number of results in diffraction theory which are important in determining the nature of the Earths core mantle boundary. Studies of the static strains and tilts using appropriate source models in media with decoupling or soft zones indicate that the observations of large tilts accompanying some earthquakes may be the result of block decoupling phenomena in the western part of the Continent.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE