Seismic velocity, attenuation and rheology of the upper mantleSeismic and rheological properties of the upper mantle in the vicinity of the low-velocity zone are expressed in terms of relaxation by dislocation glide. Dislocation bowing in the glide plane explains seismic velocities and attenuation. Climbing at higher stresses for longer periods of time give the observed viscosity, and explain the low velocity and high temperature attenuation found at seismic frequencies. Due to differing parameters, separate terms for thermal, seismic and rheological lithospheres are proposed. All three lithospheres, however, are related and are functions of temperature, and must be specified by parameters such as period, stress, and stress duration.
Document ID
19810057815
Acquisition Source
Legacy CDMS
Document Type
Other - Collected Works
Authors
Anderson, D. L. (California Inst. of Tech. Pasadena, CA, United States)
Minster, J. B. (California Institute of Technology Pasadena, CA, United States)