New Zealand Journal of Geology and Geophysics abstracts

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Note - Exceptionally deep earthquakes in the northern South Island, New Zealand

G. L. DOWNES

Institute of Geological and Nuclear Sciences Limited
P.O. Box 1320
Wellington, New Zealand

Abstract  The intermediate depth seismicity of the northern part of the South Island has been found in the past to extend to a maximum depth of about 230 km. On 1990 Jun 22, an event occurred which was routinely located at a depth of 348 km in this region. Subsequently, a data search revealed another event in 1988 of similar depth and location, less well determined but acceptable. Both events have a magnitude ML = 3.4-3.5. In the future, consideration of the deep structure in this region should take into account the possible extension of seismicity to greater depths.

Keywords   deep earthquakes; New Zealand; subduction

PDF file of entire paper: medium quality (288K); (scanned from paper original: notes about this process)

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