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Modal fields: A new method for characterization of random seismic velocity heterogeneity
Author(s) -
Goff John A.,
Holliger Klaus,
Levander Alan
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl00311
Subject(s) - sort , modal , geology , lithosphere , seismic noise , covariance , probability density function , function (biology) , binary number , geophysics , seismology , statistical physics , mathematics , physics , statistics , chemistry , arithmetic , evolutionary biology , biology , polymer chemistry , tectonics
Geologically and petrophysically constrained synthetic random velocity fields are important tools for exploring (through the application of numerical codes) the seismic response of small‐scale lithospheric heterogeneities. Statistical and geophysical analysis of mid‐ and lower‐crustal exposures has demonstrated that the probability density function for some seismic velocity fields is likely to be discrete rather than continuous. We apply the term “modal” fields to describe fields of this sort. This letter details a methodology for generating synthetic modal fields which satisfy the von Kármán covariance function. In addition, we explore some of the mathematics of “modality”, and define a modality parameter which quantifies the variation between end members binary and continuous fields.