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Gravity analysis of glaciotectonic processes, central Alpine Fault, South Island, New Zealand

Gravity analysis of glaciotectonic processes, central Alpine Fault, South Island, New Zealand
Gravity analysis of glaciotectonic processes, central Alpine Fault, South Island, New Zealand
New gravity data collected in the central West Coast of New Zealand's South Island have been used to investigate fault kinematics and structure and the effects of erosion. Buried glacial erosion channels are identified in the footwall of the Alpine Fault in the Wanganui, Whataroa and Fox floodplains. Using a modified technique for estimating channel offsets, these buried channels are found to have been displaced along the Alpine Fault by 383±74 m, 372±159 m and 450±121 m, respectively, since the Last Glacial Maximum. Adopting a date for the Last Glacial Maximum of 19±1 ka, these offsets correspond to strike-slip slip rates of 20±5 mm a?1, 20±9 mm a?1 and 24±8 mm a?1, respectively, which are consistent with previous estimates of slip rates along the central Alpine Fault. The gravity data are also used to delineate and model the South Westland Fault, a thrust fault system, 10–20 km northwest of and striking subparallel to the Alpine Fault.
gravity, Bouguer anomaly, Alpine Fault, offset, slip rate, South Island, New Zealand, South Westland Fault, glaciotectonics
0028-8306
100-108
Davy, R.
27b2af87-7c07-429e-94c6-5b66e65b5790
Stern, T
e01d191b-f820-4b98-b3a0-7417772134e3
Townend, J
b6df0737-9039-49c1-b3ff-c2c95f0c676b
Davy, R.
27b2af87-7c07-429e-94c6-5b66e65b5790
Stern, T
e01d191b-f820-4b98-b3a0-7417772134e3
Townend, J
b6df0737-9039-49c1-b3ff-c2c95f0c676b

Davy, R., Stern, T and Townend, J (2013) Gravity analysis of glaciotectonic processes, central Alpine Fault, South Island, New Zealand. New Zealand Journal of Geology and Geophysics, 56 (2), 100-108. (doi:10.1080/00288306.2013.782324).

Record type: Article

Abstract

New gravity data collected in the central West Coast of New Zealand's South Island have been used to investigate fault kinematics and structure and the effects of erosion. Buried glacial erosion channels are identified in the footwall of the Alpine Fault in the Wanganui, Whataroa and Fox floodplains. Using a modified technique for estimating channel offsets, these buried channels are found to have been displaced along the Alpine Fault by 383±74 m, 372±159 m and 450±121 m, respectively, since the Last Glacial Maximum. Adopting a date for the Last Glacial Maximum of 19±1 ka, these offsets correspond to strike-slip slip rates of 20±5 mm a?1, 20±9 mm a?1 and 24±8 mm a?1, respectively, which are consistent with previous estimates of slip rates along the central Alpine Fault. The gravity data are also used to delineate and model the South Westland Fault, a thrust fault system, 10–20 km northwest of and striking subparallel to the Alpine Fault.

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More information

Published date: 23 April 2013
Keywords: gravity, Bouguer anomaly, Alpine Fault, offset, slip rate, South Island, New Zealand, South Westland Fault, glaciotectonics
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 392636
URI: http://eprints.soton.ac.uk/id/eprint/392636
ISSN: 0028-8306
PURE UUID: e36fc07d-9f13-43e6-8d3a-2582dc6e87bc

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Date deposited: 14 Apr 2016 08:31
Last modified: 14 Mar 2024 23:49

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Contributors

Author: R. Davy
Author: T Stern
Author: J Townend

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