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

Two different methods devoted to automatic location of both regional and teleseismic events recorded on a mini-array are compared in terms of location accuracy. The first method belongs to the frequency-wavenumber methods family; the second one uses signal processing to compute accurate time-delays and then derive the event parameters. In the latter 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 distances smaller than 80 degrees, and 3 degrees for regional distances. Finally, a criterion derived from these relations is proposed for phase detection and identification.