Abstract
Abstract The 1987 March M L 6. 3 Edgecumbe earthquake occurred at shallow depth within the Whakatane Graben at the northeastern end of the onshore Taupo Volcanic Zone. The graben has formed where the north-south-trending North Island Shear Belt is intersected by the northeast-trending rift of the Taupo Volcanic Zone, and has been the site of continuing late Quaternary extension and subsidence. A history of displacement relative to sea level can be deduced from stratigraphy of drillholes on the downfaulted graben floor, and from outcrops of marine sediments on the uplifted graben margins. Subsidence had commenced before 0. 6 Ma (possibly at c. 1 Ma) and has continued to the present day at rates of c. 1–2 mm/year. Uplift of the western margin had commenced prior to 0. 4 Ma and the entire western rim was above sea level by c. 0. 3 Ma. Castlecliffian (mid Quaternary) marine sediments have been elevated to more than 300 m above present sea level, indicating long-term uplift rates of c. 1 mm/year. Uplift of the...
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