The Modified Mercalli scale (from 1 to 12) measures earthquakes by the intensity of shaking observed. This map shows the extent of shaking from the Īnangahua earthquake of 24 May 1968. From an intensity of 8 at the epicentre near Īnangahua Junction, 40 kilometres east of Westport, the isoseismal lines spread outwards. Although the most damaging shaking was on the northern part of the West Coast, the earthquake was felt over much of New Zealand.
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Source: G. L. Downes, Atlas of isoseismal maps of New Zealand earthquakes. Lower Hutt: Institute of Geological and Nuclear Sciences, 1995.