Accession Number : AD0630699

Title :   PERTURBATION THEORY FOR THE INVERSION OF BODY WAVE TRAVEL-TIME DATA,

Corporate Author : TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

Personal Author(s) : Archambeau,Charles B. ; Flinn,Edward A.

Report Date : 05 APR 1966

Pagination or Media Count : 41

Abstract : Estimation of the internal elastic structure of the earth from body wave travel times ordinarily uses both arrival time data and the slope of a curve fitted to the observed travel times. There are well known difficulties in fitting such curves, particularly in cases where the observed travel times suggest a multivalued time function. A perturbation method is described in which an initial velocity distribution, which may be chosen to be in agreement with surface wave dispersion data over the region in question, is perturbed iteratively until the theoretical travel time function is in agreement, in the least-squares sense, with the observed data. The method does not require any estimate of the curve slope or multiplicity, nor does it require a particularly dense and complete data coverage over the entire distance range. Several phases can be used simultaneously. (Author)

Descriptors :   (*PERTURBATION THEORY, *STRUCTURAL GEOLOGY), SEISMIC WAVES, PROPAGATION, TIME, CURVE FITTING

Subject Categories : Geology, Geochemistry and Mineralogy
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE