A high-pressure,high-temperature apparatus for studies of seismic wave dispersion and attenuation |
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| Authors: | Ian Jackson M S Paterson |
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| Institution: | (1) Research School of Earth Sciences, Australian National University, 0200 Canberra, ACT, Australia |
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| Abstract: | An apparatus is described which provides for the investigation of viscoelasticity/anelasticity in geologic and related materials under conditions of high pressure and temperature. Cylindrical specimens are tested in torsion—a geometry particularly well suited to shear mode observations at the low strain amplitudes of the linear regine. Forced oscillation experiments allow the measurement of disperision and attenuation at the low frequencies of teleseismic wave propagation. The conduct of complementary forced oscillation and creep tests allows recoverble anelastic strains to be distinguished from those of permanent viscous deformation. It has been demonstrated that robust measurements can be made at strain amplitudes below 10–5 and frequencies of 1 mHz–1 Hz, underP-T conditions to 300 MPa and 1200°C. The prospects for further development of this facility are outlined. |
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| Keywords: | Viscoeasticity anelasticity dispersion attenuation shear modulus creep forced oscillation methods |
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