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GNS Science Report #2011/50 Seismic Array HiKurangi Experiment II (SAHKE II) Onshore Active Source Acquisition Report A. Seward S. Henrys D. Okaya T. Stern M. Savage H. Sato T. Iwasaki R. Sutherland M. Henderson GNS Science Report 2011/50 December 2011 BIBLIOGRAPHIC REFERENCE Seward, A.; Henrys, S.; 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, GNS Science Report 2011/50. 74 p. A. Seward, GNS Science, PO Box 30368, Lower Hutt 5040, New Zealand S. Henrys, GNS Science, PO Box 30368, Lower Hutt 5040, New Zealand D. Okaya, 133 South Science Building, University of Southern California, Los Angeles, CA 90089-0740 T. Stern, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand M. Savage, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand H. Sato, Earthquake Research Institute, University of Tokyo, Japan T. Iwasaki, Earthquake Research Institute, University of Tokyo, Japan R. Sutherland, GNS Science, PO Box 30368, Lower Hutt 5040, New Zealand M. Henderson, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand © Institute of Geological and Nuclear Sciences Limited, 2011 ISSN 1177-2458 ISBN 978-0-478-19875-1 CONTENTS ABSTRACT ......................................................................................................................... IV KEYWORDS ........................................................................................................................ IV 1.0 INTRODUCTION ........................................................................................................ 1 1.1 Tectonic Setting of the Southern North Island .............................................................. 3 2.0 BOREHOLE SEISMIC SOURCES ............................................................................. 5 2.1 Location Determination ................................................................................................. 5 2.2 Permitting and Consent ................................................................................................. 5 2.3 Drilling of Boreholes ...................................................................................................... 5 2.3.1 Drilling specifications ........................................................................................ 6 2.3.2 Drilling methods ................................................................................................ 6 2.4 Borehole Explosives Specifications............................................................................. 10 3.0 SEISMOMETER DEPLOYMENT .............................................................................. 12 3.1 Location Determination ............................................................................................... 12 3.2 Instruments .................................................................................................................. 12 3.3 Instrument Programming ............................................................................................. 13 3.4 Deployment ................................................................................................................. 14 3.4.1 Weather .......................................................................................................... 15 4.0 DATA ....................................................................................................................... 16 4.1 Detonation of the Shots ............................................................................................... 16 4.1.1 Shot firing system ........................................................................................... 16 4.2 Data Merging ............................................................................................................... 18 4.3 Data Quality ................................................................................................................. 18 5.0 OUTREACH ............................................................................................................. 19 6.0 ACKNOWLEDGEMENTS......................................................................................... 20 7.0 REFERENCES ......................................................................................................... 20 GNS Science Report 2011/50 i FIGURES Figure 1.1 Location map showing various elements of the SAHKE phase 1 data acquisition. Black lines show the lines of the PEGASUS survey recorded by the SAHKE ARRAY deployment (stations shown by yellow dots). ...................................... 1 Figure 1.2 Map showing the location of the seismometers (spaced 50-100m along the dark line) deployed during SAHKE II, and the (numbered) red stars show the locations of the 12 borehole seismic sources. ................................................................ 2 Figure 2.1 Photo (a) shows the drill rig using its top drive casing hammer drilling system; (b) shows the 8in steel casing with a drill bit extension inside; (c) shows the Ecentrix Odex drill bit. ..................................................................................................... 6 Figure 2.2 Site 1 ............................................................................................................................... 7 Figure 2.3 Site 2 ............................................................................................................................... 7 Figure 2.4 Site 3 ............................................................................................................................... 7 Figure 2.5 Site 4 ............................................................................................................................... 7 Figure 2.6 Site 5 ............................................................................................................................... 8 Figure 2.7 Site 6 ............................................................................................................................... 8 Figure 2.8 Site 7 ............................................................................................................................... 8 Figure 2.9 Site 8 ............................................................................................................................... 8 Figure 2.10 Site 9 ............................................................................................................................... 9 Figure 2.11 Site 10 ............................................................................................................................. 9 Figure 2.12 Site 11 ............................................................................................................................. 9 Figure 2.13 Site 12 ............................................................................................................................. 9 Figure 2.14 Loading of shot hole 11. The MMU truck used to transport explosive emulsion. ........10 Figure 3.1 (a) photo of “Texan” seismometer attached to a vertical component sensor; (b) Photo of 3 “Texan” seismometers connected to a 3 component sensor (Black – Vertical, Blue – North, Yellow- East; (c) Photo of the ERI “Lunchbox” seismometers connected to a vertical sensor. .............................................................12 Figure 3.2 (a) REFTEK RT130 (b) 3 component sensors (3C) attached to RT130 collocated with the 3C sensor connected to 3 single Texan instruments. ....................13 Figure 3.3 Map showing the deployment regions. .........................................................................15 Figure 3.4 Radar map of the Wellington region during 15 May. ....................................................16 Figure 4.1 Shot firing trigger system. .............................................................................................16 Figure 4.2 Shot gather from Kaitoke source (shot 9). ....................................................................18 Figure 5.1 Public Notice published in local and region newspapers. ............................................19 Figure A3.1 Illustration of the drill logs for the 12 boreholes from west (12) to east (1)...................30 ii GNS Science Report 2011/50 TABLES Table 1.1 Gantt chart of the SAHKE II project timeline. See Table 3.2 for more detail of May 2011. ....................................................................................................................... 3 Table 2.1 Shot summary information ............................................................................................11 Table 3.1 Programmed recording times for the instruments deployed. ........................................13 Table 3.2 Timeline for SAHKE II during May 2011. Red indicates nights when shot were detonated, while pink indicate the time period that the instruments were programmed to record. .................................................................................................14 Table 5.1 List of media releases associated with the SAHKE project. .........................................20 Table A1.1 List of organisations and personnel that aided in the SAHKE project. .........................23 Table A1.2 Landowners / Farm managers for borehole sites .........................................................24 Table A1.3 Field Personnel .............................................................................................................25
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