Resonant amplification of earthquakes : a potential basin in south Dunedin

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Stephenson, W.R.; Barker, P.R. 1999 Resonant amplification of earthquakes : a potential basin in south Dunedin. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 99/13 59 p.

Abstract: The flat alluvial area of south Dunedin was investigated to establish whether it would be a suitable area to carry out a major study into the response of alluvial basins to earthquake shaking. The experimental techniques used were: microtremor measurements, which were analysed by the Nakamura method; small earthquakes recorded on rock and soil, which were analysed by computing soil-to-rock spectral ratios; piezocone penetrometry; and seismic cone penetrometry. The area was rejected for further study, largely because of the relative paucity of recorded earthquake shaking greater than ambient background vibration, and the revealed small size of the resonant region. Cone penetrometry showed that the small resonant region is probably an infilled channel. (auth)