New Zealand Journal of Geology and Geophysics abstracts
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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