New absolute gravity measurements in New Zealand

Yoichi Fukuda, Hiroshi Takiguchi, Takahito Kazama, Jun Nishijima, Sergei Gulyaev, Tim Natusch, Matt Amos, Vaughan Stagpoole, Christopher Pearson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To enhance and extend the absolute gravity (AG) measurements in New Zealand, we conducted new measurements using a FG5 (#210 of Kyoto University) in January and March 2016. The measurements in the North Island were made at two existing points (the Warkworth Radio Astronomical Observatory and Wellington A) and at one newly established point at the Wairakei Research Centre, Taupo. The gravity measurements in the South Island were made at five existing AG points; Godley Head, Mt John, the University of Otago, Helipad and Bealey Hotel. At each point more than 4,000 drops were made and AG values were determined with measurement uncertainties better than 3 μGal (mostly better than 2 μGal) at 130 cm instrument height. The values are compared with those of the 2015 campaigns. Although the differences of about 10 μGal were observed at Wellington A and Godley Head, those at the other points were within 5 μGal. At points in the Southern Alps we combined AG with relative gravity measurements and achieved good agreement with the 2015 results. Definite values for long-term gravity trends at the points in Southern Alps and Christchurch could not be obtained from the survey, but the results are consistent with those of the previous studies. Further measurements are planned to accurately determine these gravity changes.

Original languageEnglish
Title of host publicationInternational Symposium on Gravity, Geoid and Height Systems 2016 - Proceedings Organized by IAG Commission 2 and the International Gravity Field Service
EditorsRiccardo Barzaghi, Jeffrey T. Freymueller, Laura Sánchez, Georgios S. Vergos, Roland Pail
PublisherSpringer Verlag
Pages95-101
Number of pages7
ISBN (Print)9783319953175
DOIs
Publication statusPublished - Jan 1 2019
EventInternational Association of Geodesy (IAG) symposium “Gravity, Geoid and Height Systems 2016”, GGHS 2016 - Thessaloniki, Greece
Duration: Sep 19 2016Sep 23 2016

Publication series

NameInternational Association of Geodesy Symposia
Volume148
ISSN (Print)0939-9585

Other

OtherInternational Association of Geodesy (IAG) symposium “Gravity, Geoid and Height Systems 2016”, GGHS 2016
CountryGreece
CityThessaloniki
Period9/19/169/23/16

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All Science Journal Classification (ASJC) codes

  • Computers in Earth Sciences
  • Geophysics

Cite this

Fukuda, Y., Takiguchi, H., Kazama, T., Nishijima, J., Gulyaev, S., Natusch, T., ... Pearson, C. (2019). New absolute gravity measurements in New Zealand. In R. Barzaghi, J. T. Freymueller, L. Sánchez, G. S. Vergos, & R. Pail (Eds.), International Symposium on Gravity, Geoid and Height Systems 2016 - Proceedings Organized by IAG Commission 2 and the International Gravity Field Service (pp. 95-101). (International Association of Geodesy Symposia; Vol. 148). Springer Verlag. https://doi.org/10.1007/1345_2017_18