New Zealand Journal of Geology and Geophysics abstracts

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Timing of the most recent surface rupture event on the Ohariu Fault near Paraparaumu, New Zealand

Nicola Litchfield
Russell Van Dissen
Robert Langridge
David Heron

Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand

Carol Prentice

U.S. Geological Survey
345 Middlefield Rd
Menlo Park,
CA 94025, USA

Abstract  Thirteen radiocarbon ages from three trenches across the Ohariu Fault tightly constrain the timing of the most recent surface rupture event at Muaupoko Stream valley, c. 2 km east of Paraparaumu, to between 930 and 1050 cal. yr BP. This age overlaps with previously published ages of the most recent event on the Ohariu Fault and together they further constrain the event to 1000–1050 cal. yr BP. Two trenches provide loose constraints on the maximum recurrence interval at 3–7000 yr. Tephra, most probably the Kawakawa Tephra, was found within alluvial fan deposits in two of the trenches.

Keywords  Ohariu Fault; Paraparaumu; Wellington; strike-slip fault; paleoseismology; Kawakawa Tephra

G02049; Online publication date 25 February 2004
Received 19 September 2002; accepted 13 October 2003
New Zealand Journal of Geology & Geophysics, 2004, Vol. 47: 123–127
0028–8306/04/4701–0123 © The Royal Society of New Zealand 2004

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