Journal
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
Volume 59, Issue 1, Pages 176-186Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00288306.2015.1108922
Keywords
Earthquake deformation; Gravity New Zealand; mountain growth; water mass balance
Categories
Funding
- NSF [EAR 9902981, EAR 1519035 RAPID]
- Crafoord Foundation
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We quantify changes in gravity that have occurred over the past 15 years at 14 points between latitudes 42.5 degrees S and 44 degrees S in the South Island of New Zealand. Ten of the points form two transects across the Southern Alps and four lie in the epicentral region of the 2010 Canterbury earthquakes. At each location gravity was measured using an absolute gravimeter (FG5-111) with a nominal accuracy of 1 mu Gal. Observed changes in gravity varied from -53 to +43 mu Gal in the presence of surface elevation changes in the range -11 cm to +20 cm. Despite the difficulty in quantifying gravitational contributions from surface and subsurface water, uplift in both the Southern Alps and the Christchurch region is consistent with a Bouguer surface gradient of approximately 1.97 mu Gal cm(-1), appropriate for the mean density of crustal rocks.
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