The Modified Mercalli scale (from 1 to 12) measures earthquakes by the intensity of shaking observed. Reports from historical records and diaries have been used to compile this map showing the extent of shaking during the earthquake of 1 September 1888. From an intensity of 9 close to the epicentre at Amuri, the isoseismal lines spread outwards. Although the most severe damage was in North Canterbury, there was considerable shaking in and around Christchurch.
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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.