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Focal depths of microearthquakes indicate that seismicity in the north‐west Nelson region is confined to depths less than about 15 km. This result provides a contrast with the Marlborough and Wellington regions where earthquake activity extends through the lower crust and well into the mantle. A composite focal mechanism implies current NW‐SE compression in accord with results for shallow earthquakes in other parts of central New Zealand.
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Robinson et al. (1975) studied this question.
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