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Microearthquake study of the Alpine fault zone near Haast, South Island, New Zealand

DEPARTMENT OF GEOLOGICAL SCIENCES CORNELL UNIVERSITY, ITHACA, NEW YORK 14853

Abstract

During 1973, a 32-day study of microearthquakes along a section of the Alpine fault near Haast, South Island, New Zealand provided data on 122 earthquakes with S—P times generally less than 8 sec. Sixty of these events are well-located. Three features of the data are notable: (1) the seismic activity was shallow, concentrated in the depth range 4 to 14 km, and did not define a single fault plane; (2) little activity occurred on the trace of the Alpine fault, but more than 85 per cent of the earthquakes were within 15 km of the fault trace; (3) events often seemed to cluster in time and space, but even within these clusters, the earthquakes did not share a common focal mechanism.