EARTHQUAKE LOCATION APPLIED TO A MINI-ARRAY - K-SPECTRUM VERSUS CORRELATION METHOD

Two different methods devoted to automatic location of both regional a nd teleseismic events recorded on a mini-array are compared in terms o f location accuracy. The first method belongs to the frequency-wavenum ber methods family; the second one uses signal processing to compute a ccurate time-delays and then derive the event parameters. In the latte r method a careful study of each time-delay set is performed in order to remove ambiguity errors using Chasles relationship. It leads to an accuracy of about 10 degrees on the azimuth determination for distance s smaller than 80 degrees, and 3 degrees for regional distances. Final ly, a criterion derived from these relations is proposed for phase det ection and identification.