Abstract
A precursory swarm postulated for the Inangahua earthquake of 1968 May 23 (magnitude 7·1) was well defined over an area of 5000 km2 by magnitudes down to 2⋅4, the smallest located. The precursory gap was not well defined. The Westport earthquake sequence beginning 1962 May 10 provided the most intense part of the swarm and the largest magnitudes.

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