Gravity anomalies associated with the southern Manuherikia Valley and Dunstan fault

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Hatherton, T. 1986 Gravity anomalies associated with the southern Manuherikia Valley and Dunstan fault. [s.l.]: [s.n.]. Report / Geophysics Division 205 21 p.

Abstract: Interpretation of gravity anomalies over the Manuherikia Valley and Dunstan Range suggests that the Brassknocker segment of the Dunstan Fault is overthrust to the east and/or covered by gravitational collapse of the schist of the Dunstan Range over the valley sediments. North of the Brassknocker segment to Thompson's Gorge a vertical contact between the schist and valley sediments satisfies the gravity anomalies. Detailed gravity surveys were made in the vicinity of two seismic refraction lines near Clyde following difficulties in interpretation of the seismic data. The results illustrate the desirability of rapid gravity surveys prior to seismic surveys investigating sediment/basement contacts in order that the seismic work can be planned to optimise the information to be obtained from the more expensive seismic surveys. (auth)