Abstract
SUMMARY Arrival time reportings from local and regional networks can be used for preliminary epicentre location of teleseismic events via slowness and azimuth estimation. Robust techniques for doing so are presented, and their relative performance tested on ISC listed P arrival times of Fennoscandian stations (aperture ca. 10°). For the 10 events analysed, the most efficient technique, a variant of Geiger's method for fitting arrival times to traveltime tables, gave average location errors of less than 1° for distances from 15° to 85°.
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