Preliminary results from collaboration between Geological Survey of Japan and Institute of Geological & Nuclear Sciences

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Scott, B.J. 1996 Preliminary results from collaboration between Geological Survey of Japan and Institute of Geological & Nuclear Sciences . Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 96/36 iii, 87 p.

Abstract: Collaborative work between the Geological Survey of Japan (GSJ) and Department of Scientific and Industrial Research (DSIR) of New Zealand was initiated between the two organisations in 1990 when a Memorandum of Understanding (MOU) was signed. Soon after, the DSIR was reformed into 10 Crown Research Institutes (CRIs) and the Institute of Geological & Nuclear Sciences (GNS), one of the CRIs, has been actively maintaining contact and collaboration with GSJ. Under the MOU joint studies were initiated at White Island in 1992 (WISE92) and continued in 1993 (WISE93) as a part of the studies to support a proposed drilling programme on the island. During WISE92 and WISE93 seismological surveys were made on the island, delineating the depth and location of the earthquakes associated with the volcanic and hydrothermal systems (Nishi et al., 1996) A Self-Potential (SP) survey conducted as a part of WISE93 mapped relative upflow and downflow zones in the main crater (Nishi et al, 1995). These studies and other supporting work (ie. Mongillo and Wood, 1995) advanced the understanding of the complex volcano hydrothermal system on White Island. In the Japanese fiscal year of 1995/96 GSJ collaboration continued with GNS and focused on two themes. The first focused on White Island, extending work conducted during WISE92 and WISE93 and the other focused on geothermal areas in Taupo Volcanic Zone (TVZ). Work planned for White Island included a resistivity survey for comparison with the continuous measurements of total magnetic field made by GNS, an extended SP survey and GPS measurements to calibrate a detailed topographic map. The TVZ work included GPS measurements on lakes Taupo and Rotorua to detect undulation of the geoid as parts of an experiment to test a technique of measuring gravity anomalies over the lakes. Also conducted were seismological, gravity and SP measurements at Waimangu and Whakarewarewa geothermal fields. The SP work at Whakarewarewa focused on the geysers there and has provided a new insight into the complex interactions between them. This report produces preliminary summaries of work under taken in early 1996. These joint studies were undertaken with the financial support of Japan's collaborative study program managed by Ministry of International Trade and Industry (MITI) and sponsored by the Science and Technology Agency (STA). We would like to thank the international offices of the Agency of Industrial Science and Technology (AIST) and GSJ for their support of our joint studies. Aspects of the GNS contributions were funded by NSOF. (auth)