Research in Seismology
Semi-annual technical rept. 1 Oct 1973-30 Apr 1974
SAINT LOUIS UNIV MO
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The report discusses three important problems the source time function of micro- and moderate-size earthquakes, the state of stress in the interior of a continental lithospheric plate, and the relation of present-day earthquake activity in the central United States to geological features. With regard to the first, it has been shown that it is possible to derive empirically an observational scaling law which is consistent and which is directly related to the source parameter of seismic moment. With regard to the latter two problems, it has been shown that the stress distribution implied by the observed focal mechanism solutions is considerably more complicated than has been proposed by such findings as those of Sbar and Sykes 1973.