Accession Number : AD0842357

Title :   Effects of Upper Crust in the Llano Uplift Region on Teleseismic P Waves.

Descriptive Note : Technical data rept.,

Corporate Author : GEOTECH GARLAND TX

Personal Author(s) : Masse, Robert P. ; Simons, Richard S. ; Travis, Herbert S. ; Weisbrich, Rudi A.

Report Date : 30 JUL 1968

Pagination or Media Count : 49

Abstract : A seismic investigation was performed in the Llano Uplift area in central Texas to study the effects of the sedimentary layers on teleseismic P waves. Five LRSM short-period portable systems were operated along a geological profile in which the sedimentary section decreases gradually in thickness from about 12,000 feet to zero feet at the granite outcrop. The spectral response of the sedimentary layers beneath each of the seismic station sites was computed from known values of velocity and density. It was determined that the spectral content of the teleseismic P waves recorded at these locations had been affected relatively little by the sedimentary layers. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, TEXAS), (*ROCK, SEISMIC WAVES), THICKNESS, SEDIMENTATION, POWER SPECTRA, VELOCITY, SEDIMENTARY ROCK, SEISMOMETERS, RESPONSE, PORTABLE EQUIPMENT, GRANITE, SPECTRUM SIGNATURES.

Subject Categories : Geology, Geochemistry and Mineralogy
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE