Accession Number : AD0474981


Title :   INVESTIGATION OF PHASE VELOCITIES OF LONG PERIOD SURFACE WAVES AND FOCAL MECHANISM STUDIES.


Descriptive Note : Final rept. 1 Aug 60-31 Aug 65,


Corporate Author : SAINT LOUIS UNIV MO


Personal Author(s) : Stauder, William ; Nuttli, Otto


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/474981.pdf


Report Date : Sep 1965


Pagination or Media Count : 50


Abstract : The research conducted under this contract concerned the following general areas of investigation: (1) Establishment of a network of seismic s stations in the central U.S. suitable for the study of long period surface waves and other specialized studies; (2) Phase and group velocity studies of surface waves: these include phase velocity determinations of both Love and Rayleigh waves, inversion of the velocity data, group velocities of very short period Rayleigh waves, and group velocities along paths which cross the Caribbean Sea; (3) Reduction of ground motion to motion in the incident wave; theoretical work by Haskell has been verified from observational data and further developed to study angles of incidence of P waves and polarization of S waves which traverse a multilayered crust. Crustal transfer functions for various crustal models have been determined and used to study the effect on ground motion of changes in crustal parameters. Other studies summarized include: focal mechanism determinations; focal depth; inversion of body wave data; effect of low velocity channels on travel times; and local crustal structure, seismicity, Pn velocity. A brief discussion of work accomplished is given in the body of the report, followed by abstracts of papers published. (Author)


Descriptors :   *SEISMIC WAVES , DEPTH INDICATORS , DETECTION , EARTHQUAKE WARNING SYSTEMS , EARTHQUAKES , FOCUSING , FREQUENCY , MOTION , PHASE STUDIES , SEISMOLOGICAL STATIONS , SURFACE PROPERTIES , TERRAIN , VELOCITY , WAVE PROPAGATION


Subject Categories : Seismology
      Seismic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE