Seismic Array HiKurangi Experiment II (SAHKE II) : onshore active source acquisition report

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SR_2011-050-pdf
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Seward, A.; Henrys, S.A.; Okaya, D.; Stern, T.; Savage, M.; Sato, H.; Iwasaki, T.; Sutherland, R.; Henderson, M. 2011 Seismic Array HiKurangi Experiment II (SAHKE II) : onshore active source acquisition report. Lower Hutt, N.Z.: GNS Science. GNS Science report 2011/50 70 p. + 1 CD

Abstract: This report documents the planning and acquisition of an active source seismic experiment in the lower North Island. The Seismic Array HiKurangi Experiment (SAHKE) was designed to investigate the physical parameters controlling locking at the plate boundary beneath the southern North Island and characterise slip processes in the key segment of the Hikurangi margin. This 2011 experiment is the second phase of a two-phase seismic survey to study the characteristics of the subduction interface beneath the Wellington – Wairarapa region. 12 borehole explosive sources were distributed along a NW-SE transect stretching from coast to coast (Kapiti to Glendu). The energy was recorded on 835 seismic stations (277 3-component and 558 vertical sensors) deployed at 100 m spacing and 50 m between Kaitoke and Featherston. Additional 3-component seismometers were deployed at each shot point. The shots were detonated during the night time of May 10-11 and May 12-13, between the hours of 9pm and 5 am. The quality of the data recorded was excellent for all shots. (auth)