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Laboratory measurements of seismic moduli and attenuation in antigorite serpentinite at a confining pressure of 200 MPa and temperatures up to 550 °C provide new results relevant to the interpretation of geophysical data in subduction zones. A polycrystalline antigorite specimen was tested via forced oscillations at small strain amplitudes and seismic frequencies (millihertz to hertz). The shear modulus has a temperature sensitivity,  ∂  G / ∂  T , averaging −0.017 GPa/K. Increasing temperature above 500 °C results in more intensive shear attenuation (    Q    G    −  1    ) and associated modulus dispersion, withQ    G    −  1increasing monotonically with increasing oscillation period and temperature. This “background” relaxation is adequately captured by a Burgers model for viscoelasticity and possibly results from intergranular mechanisms. Attenuation is higher in antigorite (   log  10Q    G    −  1    ≈  −  1  .  5   at 550 °C and 0.01 Hz) than in olivine (   log  10Q    G    −  1    ≪  −  2  .  0   below 800 °C), but such contrast does not appear to be strong enough to allow robust identification of antigorite from seismic models of attenuation only.

Low‐Frequency Measurements of Seismic Moduli and Attenuation in Antigorite Serpentinite