Analysis of Explosion Generated Surface Waves in Africa, Results from the Discrimination Experiment and Summary of Current Research
Quarterly rept. 1 Jan-31 Mar 1978
SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CA
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Brief summaries of work currently underway or recently completed are given in four study topic areas Source, Data Analysis, Surface Wave, and Body Wave. The remainder of the report presents research results not previously reported 1 Discrimination Experiment--Digital short- and long-period body and surface wave data for Eurasian events recorded at a global network of stations are being provided for event discrimination. Efforts have focused on application of the VFM Variable Frequency Magnitude discriminant to the short period P waves at four stations 2 Analytic Continuation of the Elastic Field from a Complex Source in a Halfspace. This section presents the mathematical development of a method for linking finite difference numerical source calculations in a halfspace with analytical techniques for propagating elastic waves in layered media 3 Theoretical Computation of Lg--This discussion is concerned with the theoretical generation of Lg in a continental earth model. Synthetic seismograms are shown for several ranges and source depths, and 4 Analysis of Surface Waves from the French Test Site in the Sahara.