Abstract
A description is given of active faults in New Zealand. The circum-Pacific mobile belt extends north-east through the New Zealand islands. Within the belt active faults are numerous and mostly transcurrent; outside the belt they are few and mostly normal. The Alpine Fault is the most important. It extends along the north-western side of the Southern Alps in an almost straight line for 300 miles and then branches. At one of the most important branches, the Wairau Fault, the horizontal displacement since the end of the Last Glaciation is about 200 ft. The post-glacial terraces are displaced by an amount proportional to their height above the present river level. Active normal faults are most common in the volcanic zone of the North Island. They are parallel to the zone and lie at the margin of the mobile belt.
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