Williams, D.N. 1974 Ohariu fault zone investigations at Porirua. Geological report. Housing division, block 21. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 195 12 p.
Abstract: The Ohariu Fault zone and active bounding faults have been mapped in the area of Housing Division Block 21, South of Porirua Hospital. The east active fault is mapped from Titahi Bay Main Road to a point surveyed in Block 21. The west active fault is mapped from Titahi Bay Main Road to Oharia Valley, but cannot be located accurately in the north. The zone between the faults is not classed as active but structures within it are subject to some risk of small displacement. Structures sited on the active margins of the zone are subject to high risk of significant displacement up to several meters, in the event of movement on the Ohariu Fault in this area. Accompanying maps show the positions of active faults in Block 21 and surrounding area. (auth)