Map of faults in Auckland region. Definite active faults as defined in the GNS database[1] are shown in red.[2][3] Not all the other faults shown in (grey) are well characterised and Kenny et al. have tried to evaluate this.[4] Well characterised fault segments are in dark grey. A number of faults characterised by sea floor studies off the west coast of North Island are not shown as reasonably accurate data does not appear to be in public domain.[5] If you click on Map to enlarge it this enables mouse over of the fault names.
The Auckland regional geologic faults have low seismic activity,[6][1] compared to much of New Zealand, but do result in an earthquake risk to the Auckland metropolitan area, New Zealand's largest city. There is also evidence of past tectonic, volcanic associations in a city located within what is, at best, a very recently dormant Auckland volcanic field.
The only definite active fault in the Auckland Region, as defined geopolitically, is the Wairoa North Fault.[2] However, there could be other possibly active faults within the Auckland region. These include the Drury Fault[7] and the Firth of Thames Fault.[8] Further, the adjacency of the Hauraki Rift to Auckland means that the active Kerepehi Fault with its risk of magnitude 7 or above events is relevant to seismic risk.[3]
^ abNew Zealand Active Fault database
^ abWise, Darryn J.; Cassidy, John; Locke, Corinne A. (2003). "Geophysical imaging of the Quaternary Wairoa North Fault, New Zealand: a case study". Journal of Applied Geophysics. 53 (1): 1–16. Bibcode:2003JAG....53....1W. doi:10.1016/S0926-9851(03)00013-2. ISSN 0926-9851.
^ abPersaud, Mira; Villamor, Pilar; Berryman, Kelvin; Ries, William; Cousins, J.; Litchfield, N.; Alloway, Brent (2 Jan 2016). "The Kerepehi Fault, Hauraki Rift, North Island, New Zealand: active fault characterisation and hazard". New Zealand Journal of Geology and Geophysics. 59 (1): 117–135. Bibcode:2016NZJGG..59..117P. doi:10.1080/00288306.2015.1127826. S2CID 130085657.
^Cite error: The named reference Kenny2012 was invoked but never defined (see the help page).
^Cite error: The named reference Stagpoole1997 was invoked but never defined (see the help page).
^van Wijk, K.; Chamberlain, C. J.; Lecocq, T.; Van Noten, K. (2021). "Seismic monitoring of the Auckland Volcanic Field during New Zealand's COVID-19 lockdown". Solid Earth. 12 (2): 363–373. Bibcode:2021SolE...12..363V. doi:10.5194/se-12-363-2021.
^Linton, Andrew (2019-08-09). "Drury Plan Change:Geotechnical Assessment Report" (PDF). Fulton Hogan Land Development Limited. Retrieved 2022-11-15.
^Hochstein, M.P.; Nixon, I.M. (1979). "Geophysical study of the Hauraki Depression, North Island, New Zealand". New Zealand Journal of Geology and Geophysics. 22 (1): 1–19. Bibcode:1979NZJGG..22....1H. doi:10.1080/00288306.1979.10422550.
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