Accession Number : ADA254348


Title :   Regional Seismograms: Attenuation and Scattering


Descriptive Note : Final rept. 1 Jul 1989-31 Dec 1991


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE EARTH RESOURCES LAB


Personal Author(s) : Toksoz, M N ; Charrette, Edmond E ; Cheng, Ningya ; Dainty, Anton M ; Mandal, Batakrishna ; Peng, Chengbin ; Schultz, Craig A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254348.pdf


Report Date : 06 Mar 1992


Pagination or Media Count : 363


Abstract : The objective of this study was to examine the influence of attenuation and scattering on regional high frequency seismograms. This report consists of a Ph.D. thesis, a paper, and three preprints of papers either submitted or in preparation, on work supported by this project; they include both basic work on attenuation, scattering and anisotropy, and applications to regional seismograms. The Ph.D. thesis discusses the application of the finite difference method to problems in scattering and attenuation due to scattering in a random medium. In the first three chapters of the thesis, the application of Born theory to scattering and scattering attenuation is assessed. The fourth chapter to explain the observed scattering phenomena at the NORSAR and NORESS arrays in Norway. The second section is a paper that examines the radiation pattern of explosive sources in anisotropic media. The third section evaluates the problem of Lg blockage across crustal extension zones by the method of coupled modes. The fourth section is concerned with the fundamental problem of scattering of the reflected wave from a rough interface. The final section applies transport theory to Rg data from a U.S. Geological Survey experiment in Maine.


Descriptors :   *SEISMIC WAVES , *SEISMOLOGY , *SEISMOGRAPHS , VELOCITY , SCATTERING , HIGH FREQUENCY , TWO DIMENSIONAL , EXPLOSIONS , UNDERGROUND EXPLOSIONS , ARRAYS , THESES , GEOLOGY , MAINE , SEISMOLOGICAL STATIONS , RAYLEIGH WAVES , PRIMARY WAVES(SEISMIC WAVES) , NORWAY , ATTENUATION , FINITE DIFFERENCE THEORY , SEISMIC DATA , SEISMIC REFLECTION , MIE SCATTERING , WAVE PROPAGATION , ANISOTROPY , EARTH CRUST


Subject Categories : Seismology
      Seismic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE