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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mitchell, Thomas
University College London
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2021ESHRE guideline: medically assisted reproduction in patients with a viral infection/diseasecitations
- 2018Mineralogical control on thermal damage and the presence of a thermal Kaiser effect during temperature-cycling experiments
- 2018Quantifying the effect of core plug edge effects on porosity and permeability under uniaxial and triaxial loading conditions
- 2018Low-Frequency Measurements of Seismic Velocity and Attenuation in Antigorite Serpentinite
- 2018Fault Reactivation at the Brittle-Ductile Transition
- 2017Mineralogical control on thermal damage and the presence of a thermal Kaiser effect during temperature-cycling experiments
- 2016The effect of fluids on the frictional behavior of calcite gouge
- 2013Deformation band-like defects as possible precursors to microfracture planes, resulting in the generation of nanopowders on simulated fault planes
- 2013Strain localization in experimentally sheared gouge layers
- 2012Frictional processes in volcanic conduits
- 2011Ultra-low co-seismic stiffness of fault rocks at seismogenic (8-11 km) depth
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document
Low-Frequency Measurements of Seismic Velocity and Attenuation in Antigorite Serpentinite
Abstract
Emmanuel C. David, N. Brantut, L. N. Hansen, T. M. Mitchell and I. Jackson Laboratory measurements of seismic velocity and attenuation in antigorite serpentinite at confining pressure of 2kb and temperatures to 550°C provide new results relevant to the interpretation of geophysical data in subduction zones. A copper-jacketed polycrystalline antigorite specimen was tested via torsional and flexural forced-oscillations at small strain amplitudes (<10<SUP>-5</SUP>) and low frequencies representative of the seismic band (mHz-Hz). The mechanical behaviour is independent of increasing annealing duration at 500°C; no evidence of dehydration is found in post-mortem microstructures. Both such observations indicate that the mechanical measurements were taken in the antigorite stability field. The shear modulus (G) has a temperature sensitivity ∂G/∂T averaging -0.015GPa.K<SUP>-1</SUP> for the 1s oscillation period. Increasing temperature above 500°C results in more intensive shear attenuation (Q<SUP>-1</SUP>) and associated modulus dispersion, with Q<SUP>-1</SUP> increasing monotonically with increasing oscillation period and temperature (Q<SUP>-1</SUP>≈0.03 at 550°C and 0.01Hz). This "background" relaxation is adequately captured by a Burgers viscoelastic model and arises from solid-state, diffusional processes possibly operative at grain boundaries. This new dataset reveals contrasting seismic properties between antigorite and olivine at comparable temperatures, with noticeably higher levels of shear dissipation in antigorite, and a shear modulus in antigorite that is approximately half of that in olivine....