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The images below are an exploration of all data captured up until 2025-04-30 01:04:09.314 (GMT).
Each image shows magnitude coloured by depth.
Older material is obviously sparse and has been derived by intelligent guess work.
It is not until 1940 that data was trapped consistently.
It can be seen that techniques and methods have evolved over time.

half-decade-1900
half-decade-1905
half-decade-1910
half-decade-1915
half-decade-1920
half-decade-1925
half-decade-1930
half-decade-1935
half-decade-1940
half-decade-1945
half-decade-1950
half-decade-1955
half-decade-1960
half-decade-1965
half-decade-1970
half-decade-1975
half-decade-1980
half-decade-1985
half-decade-1990
half-decade-1995
half-decade-2000
half-decade-2005
half-decade-2010
half-decade-2015
half-decade-2020
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We acknowledge and thank the New Zealand GeoNet project and its sponsors EQC, GNS Science and LINZ for providing the data used in this study. http://info.geonet.org.nz/