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dc.contributor.authorde Lange, P.J.
dc.contributor.authorLowe, David J.
dc.date.accessioned2011-04-10T21:52:53Z
dc.date.available2011-04-10T21:52:53Z
dc.date.issued1990
dc.identifier.citationde Lange, P.J. & Lowe, D.J. (1990). History of vertical displacement of Kerepehi Fault at Kopouatai bog, Hauraki Lowlands, New Zealand, since c. 10 700 years ago. New Zealand Journal of Geology and Geophysics, 33(2), 277-283.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5261
dc.description.abstractThirteen tephra layers interbedded with peat, and a basal peathorizon, in four pairs of cores provide radiocarbon-dated reference horizons that indicate vertical displacement on the Kerepehi Fault at Kopouatai bog, Hauraki Lowlands. Progressive offset of the horizons with time shows that vertical fault movement, downthrown to the west, has been occurring for the past c. 10 700 radiocarbon years at an approximately uniform rate of c. 0.13 mm/yr. Step functions indicate faulting events earthquakes at c. 1400, c. 5600, c. 6800, and C. 9000 years ago, a mean recurrence interval of c. 2500 years. These findings support geophysical and geological evidence that the Hauraki Depression is an active rift, and show that active faulting occurs along the northern as well as southern extensions of the Kerepehi Fault. If such earthquakes occur randomly in time, and based on the return period of 2500 years, there are 2%, 18%, and 33% probabilities of a major earthquake affecting the Kerepehi Fault at Kopouatai bog in the next 50, 500, and 1000 years, respectively.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.relation.urihttp://www.royalsociety.org.nz/publications/journals/nzjg/en_NZ
dc.rightsThis article has been published in the journal: New Zealand Journal of Geology and Geophysics. © Crown copyright 1990. Used with permission.en_NZ
dc.subjectFaultsen_NZ
dc.subjectpaleoearthquakesen_NZ
dc.subjectstratigraphyen_NZ
dc.subjecttephrochronologyen_NZ
dc.subjectHoloceneen_NZ
dc.subjectHauraki Riften_NZ
dc.subjectKerepehi Faulten_NZ
dc.subjectKopouatai bogen_NZ
dc.titleHistory of vertical displacement of Kerepehi Fault at Kopouatai bog, Hauraki Lowlands, New Zealand, since c. 10 700 years agoen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1080/00288306.1990.10425685
dc.relation.isPartOfNew Zealand Journal of Geology and Geophysicsen_NZ
pubs.begin-page277en_NZ
pubs.elements-id133792
pubs.end-page283en_NZ
pubs.issue2en_NZ
pubs.volume33en_NZ


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