Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip (HOBITSS III)

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Henrys, S.A.; Harris, R.; Ito, Y.; Kido, M.; Kinoshita, C.; Muramoto, T.; Ohta, K.; Quinn, W.; Suzuki, S.; Tomita, F.; Zal, H. 2016 Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip (HOBITSS III). Lower Hutt, N.Z.: GNS Science. GNS Science report 2016/38 iii, 66 p. doi:10.21420/G2VC9

Abstract: HOBITSSIII was a 12 day (19–30 June) Wellington to Wellington RV Tangaroa voyage (TAN1607) to recover previously deployed Absolute Pressure Gauges (APGs) along the northern Hikurangi margin. APGs measure vertical displacement of the seafloor. One APG from University of Texas Institute of Geophysics, UTIG and 5 APGs from Kyoto University were recovered. Five APGs from Kyoto University were also deployed on the TAN1607 voyage and will be recovered in mid-2017. Three separate 8–12 hour GPS-Acoustic surveys were completed by Tohoku University personnel in the vicinity of 3 ocean bottom GPS-A transponders. The GPS-A surveys will be used to determine horizontal rates of motion at the offshore Hikurangi margin. Heat flow measurements were also conducted at 4 sites. Heat flow surveys add to previous measurements made on the RV Roger Revelle in May 2015. 266 km of 2.0–6.0 kHz chirp sub-bottom profiler data were acquired across the Tuaheni Landslide Complex in preparation for scientific drilling in 2017 and 2018. When TAN1607 data are added to the collective offshore geophysical datasets, they will increase the tectonic and geological knowledge of the northern Hikurangi margin. (auth)