Kinematics of the New Zealand plate boundary : field report on GPS surveys of the Fiordland/Southland network in 2006 and 2007 (FIOR2006, FIOR2006A & FIOR2007)

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Palmer, N.G.; Beavan, R.J.; Archibald, G.C. 2009 Kinematics of the New Zealand plate boundary : field report on GPS surveys of the Fiordland/Southland network in 2006 and 2007 (FIOR2006, FIOR2006A & FIOR2007). Lower Hutt, N.Z.: GNS Science. GNS Science report 2009/52 94 p.

Abstract: During an extended period from 7 December 2005 until 31 May 2006, a combined team from GNS Science and the University of Otago Survey School measured a Global Positioning System (GPS) network throughout the Southland and Fiordland area of New Zealand. This “FIOR2006” campaign is intended to repeat an initial comprehensive GPS survey of the Southland/Fiordland region that was carried out in 2001. Between 2001 and the current survey a number of smaller localised GPS surveys had been carried out in response to the August 2003 Fiordland earthquake; however, the 2006 survey is the first comprehensive resurvey. During December 2006, an Otago University party collected GPS observations at sites in the vicinity of the 2003 Secretary Island earthquake. This “FIOR2006A” campaign was a continuation of previous observations (“FIOR2004”, “FIOR2005”) designed to monitor possible post-seismic deformation following that earthquake. On 15 October 2007 a magnitude 6.7 earthquake occurred approximately 24 km deep and 60 km west of Milford Sound. In response to this an additional localised GPS survey (FIOR2007) was carried out in the period from 11 to 16 November 2007, with the intention of measuring the resulting co-seismic deformation. This report documents both the “FIOR2006” comprehensive resurvey, the “FIOR2006A” post-seismic deformation survey and the “FIOR2007” earthquake response survey. It describes the logistics of the campaigns, the sites occupied and the data collected. The observations are part of a Foundation for Research, Science and Technology (FRST) supported project “Impacts of Plate Tectonics in and around New Zealand” at GNS Science. It is intended that these observations will be used in continuing studies into earth deformation within the Southland/Fiordland region. (auth)