Title: The Hawke's Bay, New Zealand, earthquake of 1982 September 02 and deformation in the interior of the subducted Pacific plate
Abstract: The most damaging earthquake to occur in New Zealand in 1982 was the Hawke's Bay earthquake of September 02 (mb = 5.6). An aftershock study using portable microearthquake recorders has established that this event occurred some 20 km south of Hastings, at a depth of about 47 km. This depth places the event in the mantle of the subducted Pacific plate. This earthquake is a member of a recently recognized class of intraplate shocks occurring along the strike of the subducted plate near the east coast of the North Island. Such events are characterized by normal-faulting mechanisms. When taken together with activity in the crust of the subducted plate, this subcrustal activity resembles a double-planed seismic zone, restricted in the down-dip direction of the subducted plate. Several lines of evidence suggest that deformation in the mantle of the subducted plate is controlled by the state of coupling of the plate interface at shallow depth: (1) the subcrustal activity occurs directly beneath the source region of major interplate earthquakes along the east coast of the North Island, and there appears to be a pairing of interplate and subcrustal events; (2) stress directions determined for the subcrustal events are concordant with geodetic strain directions; and (3) the amount of subcrustal activity appears to be related to the state of coupling of the plate interface.
Publication Year: 1984
Publication Date: 1984-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 8
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