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Automatic event detection and location capabilities of large aperture seismic arrays

DEPARTMENT OF EARTH AND PLANETARY SCIENCES MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02139

Abstract

The detection and location capabilities of large aperture seismic arrays (LASA in Montana and NORSAR in Norway) were determined on the basis of the Detection Logs, Summary Bulletins and NOAA-ERL Preliminary Determination of Epicenters. Estimates of signal and false alarm distributions indicated that LASA can detect on the average 120 seismic signals a day and NORSAR about 35. The probability of detection of an event was estimated for LASA and NORSAR as a function of distance and magnitude.

A method of obtaining theoretical estimates of the location capability of an array as a function of beam resolution, phase type, and slowness, dT/d, is described. Theoretical estimates of the array's location capability compared to observed estimates imply that the arrays are operating close to their expected limits.

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