Experimental friction data for simulated Nankai Trough gouges sheared under a range of effective normal stress and pore-fluid pressure conditions (NERC Grant NE/S015531/1)
The data are from a suite of friction experiments performed on simulated gouges from the Nankai Trough (Japan). The simulated gouges were prepared by crushing cuttings of Nankai accretionary sediments collected during Integrated Ocean Drilling Program (IODP) Expedition 358. The cuttings were crushed to produce a powder (i.e. simulated gouge) with a grain size of >125 microns. These simulated gouges were sheared under a range of effective normal stress (10-75 Mpa) and pore-fluid pressure (5-75 Mpa) conditions while the sliding velocity was stepped between 0.3 and 3 microns/s to calculated the rate-and-state friction parameter (a-b). The Nankai gouge are strongly rate-strengthening and become more rate-strengthening (i.e. more frictionally stable) at elevated pore-fluid pressure. In contrast, varying the effective normal stress has minimal effect on the frictional stability of the gouges.
non geographic dataset
:
http://data.bgs.ac.uk/id/dataHolding/13607728
English
Geoscientific information
GEMET - INSPIRE themes, version 1.0:
BGS Thesaurus of Geosciences:
Fault gouge
Normal stress
Subduction zones
NGDC Deposited Data
Pore pressure
Free:
Free:
NERC_DDC
creation: 2021-03-30
2020-01-01
-
2020-10-30
University of Liverpool
John Bedford
School of Environmental Sciences, 4 Brownlow Street,
Liverpool,
L69 3GP
email:
not available
Role: originator
University of Liverpool
Professor Daniel Faulkner
School of Environmental Sciences, 4 Brownlow Street,
Liverpool,
L69 3GP
email:
not available
Role: principal investigator
British Geological Survey
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British Geological Survey
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Data Quality
Data were collected using a direct shear setup, where layers of Nankai gouge were sheared in a triaxial deformation apparatus. In the direct shear geometry the normal stress is applied by the confining pressure (Pc), and pore fluid pressure (Pf) is introduced to the sample through the three porous disks on each of the direct shear forcing blocks. A total of 20 different experiments were performed, at four different effective normal stresses (10, 25, 50 and 75 MPa) and five different pore-fluid pressures (5, 10, 25, 50 and 75 MPa). In each experiment the gouge layers were sheared for an initial 1.5 mm displacement at 0.3 microns/s, before velocity steps of 0.3 to 3 microns/s and back were applied every subsequent 1 mm of displacement to determine the rate-dependence of slip, (a-b). The total displacement in each experiment is 8.5 mm.
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Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
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bf8c6c60-12af-4b3f-e054-002128a47908
British Geological Survey
Environmental Science Centre,Keyworth,
NOTTINGHAM,
NG12 5GG,
United Kingdom
tel: +44 115 936 3100
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enquiries@bgs.ac.uk
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2024-04-24