期刊
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
卷 50, 期 3, 页码 239-243出版社
RSNZ PUBLISHING
DOI: 10.1080/00288300709509834
关键词
Martinborough fault; wairarapa; reverse fault; slip rate; alluvial fan; MfE active fault guidelines
New mapping of the Martinborough Fault utilising high resolution LIDAR data and orthophotos defines a c. 1.3 krn long active fold trace consisting of a broad (50-150 rn wide) warp crossing dissected alluvial fans. GPS survey profiles across the fold-scarp reveal vertical separations ranging from 1.2 to 6 m on two fan surfaces. Published OSL ages imply a Porewan age for the upper fan (surface age c. 55 ka). We calculate a revised vertical slip rate of c. 0. 1 mm/yr (previously published rates range between 0.3 and 0.67 mrn/yr) and a recurrence interval of c. 15 000 yr from these new data. This places the fault within the Ministry for the Environment Active Fault Guidelines Recurrence Interval Class V (>10 000 to >= 20 000 yr), to which a medium level of confidence is assigned.
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