Earthquake risk in New Zealand: Statistical estimates

From the historical record of New Zealand earthquakes, the mean return periods for Modified Mercalli intensities VI, VII, VIII, and IX throughout the country are calculated. Results are presented in the form of contour maps and also a tabulated list for 19 cities and towns. The work attempts to document what has happened since 1840 but, the results may be used for future planning, on the assumption that the historical record represents an average level of activity.