RESEARCH IN SEISMOLOGY
Abstract
The seismic research activities are grouped in four categories. In the first, the utilization of LASA data for various seismological studies is discussed. P-wave velocity-depth distribution in the mantle is obtained along two profiles. Frequency-wavenumber structure of microseisms are investigated using both the long and short period data from LASA and it is found that at periods shorter than 5 seconds predominant noise peaks correspond to higher mode Rayleigh waves and P-wave noise. The structure and inhomogeneities of the upper mantle are studied using seismic and other geophysical data. In Japan the surface wave dispersion data are best fitted by a model containing thin soft layers in the upper mantle. Seismic, heat flow, geopotential, surface topography and crustal data are correlated using coefficients of spherical harmonics up to the third order. It is found that some lateral density variations may exist in the upper and lower mantle. The near source and far- field seismic data from the Parkfield earthquake of 1966 are analyzed for source mechanism and attenuation studies.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1967
- Accession Number
- AD0666482
Entities
People
- Frank Press
- M. Nafi Toksöz
Organizations
- Massachusetts Institute of Technology