An Integrated Approach to Seismic Event Location. 1. Evaluating How Method of Location Affects the Volume of Groups of Hypocenters
TEXAS UNIV AT AUSTIN INST FOR GEOPHYSICS
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When seismic events occur in spatially compact clusters, the volume and geometric characteristics of these clusters often provides information about the relative effectiveness of different location methods, or about physical processes occurring within the hypocentral region. This report defines and explains how to determine the convex polyhedron of minimum volume CPMV surrounding a set of points. We evaluate both single-event and joint hypocenter determination JHD relocations for three rather different clusters of seismic events 1 nuclear explosions from Mururoa relocated using P and PKP phases reported by the ISC 2 intermediate depth earthquakes near Bucaramanga, Colombia, relocated using P and PKP phases reported by the ISC and 3 shallow earthquakes near Vanuatu formerly, the New Hebrides, relocated using P and S phases from a local station network. This analysis demonstrates that different location methods markedly affect the volume of the CPMV, however, volumes for JHD relations are -not always smaller than volumes for single-event relocations. ... Seismic event location, Seismic strain, Seismic discrimination.