
Haines, A.J.; Darby, D.J. 1987 Preliminary dislocation models for the 1931 Napier and 1932 Wairoa earthquakes. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EDS 114; Geophysics Division contract report 9 1 v.
Abstract: Preliminary dislocation models for the 1931 Napier and 1932 Wairoa earthquakes can be inferred from geodetic and geological observations of surface deformation, seismic information about the events themselves, and offshore seismic exploration data. The 1931 Napier earthquake possibly involved movement on a major northeast trending submarine fault in Hawke Bay, with a rupture about 80 km long, from 5 km to possibly 35 km deep, dip in the range 59o to 68o northwest, dip-slip in the range 6 m to 8 m, and right-lateral strike-slip in the range 4 m to 8 m. Three models are presented in detail. The 1932 Wairoa earthquake was possibly on a northeastward continuation of this rupture, from 50 km to 70 km long, from 5 km to possibly 35 km deep, dipping about 68o northwest, with 1 m of either reverse or normal dip-slip, and 1 m right-lateral strike-slip. A model for each of the reverse and normal faulting cases is presented in detail.