The Northland Earthquakes of 1963 November-December and the Seismicity of Northland

Abstract

The earthquakes at Mangonui on 1963 November 16 and at Peria on 1963 December 22 are the first earthquakes in Northland for which it has been possible to determine instrumental epicentres. Details of epicentre, magnitude, and focal depth calculations are given, together with a description of the felt effects, photographs of damage, and isoseismal maps. Earthquakes felt in Northland since 1955 January 1 are listed. The earlier conclusion that this part of New Zealand is aseismic is no longer justified.