David A Lockner
David Lockner is a geophysicist in the Earthquake Science Center.
Science and Products
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A viscoelastic damage model with applications to stable and unstable fracturing A viscoelastic damage model with applications to stable and unstable fracturing
A viscoelastic damage rheology model is presented that provides a generalization of Maxwell viscoelasticity to a non-linear continuum mechanics framework incorporating material degradation and recovery, transition from stable to unstable fracturing and gradual accumulation of non-reversible deformation. The model is a further development of the damage rheology framework of Lyakhovsky et...
Authors
Yariv Hamiel, Yunfeng Liu, V. Lyakhovsky, Yehuda Ben-Zion, David Lockner
High-pressure rock-physics laboratories investigate earthquake processes High-pressure rock-physics laboratories investigate earthquake processes
No abstract available.
Authors
C.A. Morrow, D.A. Lockner
Crystallographic controls on the frictional behavior of dry and water-saturated sheet structure minerals Crystallographic controls on the frictional behavior of dry and water-saturated sheet structure minerals
We compare the frictional strengths of 17 sheet structure mineral powders, measured under dry and water-saturated conditions, to identify the factors that cause many of them to be relatively weak. The dry coefficient of friction μ ranges upward from 0.2 for graphite, leveling off at 0.8 for margarite, clintonite, gibbsite, kaolinite, and lizardite. The values of μ (dry) correlate...
Authors
Diane E. Moore, D.A. Lockner
The coefficient of friction of chrysotile gouge at seismogenic depths The coefficient of friction of chrysotile gouge at seismogenic depths
We report new strength data for the serpentine mineral chrysotile at effective normal stresses, σn between 40 and 200 MPa in the temperature range 25°-280°C. Overall, the coefficient of friction, μ (= shear stress/effective normal stress) of water-saturated chrysotile gouge increases both with increasing temperature and σn, but the rates vary and the temperature-related increases begin...
Authors
Diane E. Moore, D.A. Lockner, H. Tanaka, K. Iwata
Anisotropic changes in P-wave velocity and attenuation during deformation and fluid infiltration of granite Anisotropic changes in P-wave velocity and attenuation during deformation and fluid infiltration of granite
Fluid infiltration and pore fluid pressure changes are known to have a significant effect on the occurrence of earthquakes. Yet, for most damaging earthquakes, with nucleation zones below a few kilometers depth, direct measurements of fluid pressure variations are not available. Instead, pore fluid pressures are inferred primarily from seismic-wave propagation characteristics such as Vp...
Authors
S. A. Stanchits, D.A. Lockner, A.V. Ponomarev
Why earthquakes correlate weakly with the solid Earth tides: Effects of periodic stress on the rate and probability of earthquake occurrence Why earthquakes correlate weakly with the solid Earth tides: Effects of periodic stress on the rate and probability of earthquake occurrence
We provide an explanation why earthquake occurrence does not correlate well with the daily solid Earth tides. The explanation is derived from analysis of laboratory experiments in which faults are loaded to quasiperiodic failure by the combined action of a constant stressing rate, intended to simulate tectonic loading, and a small sinusoidal stress, analogous to the Earth tides. Event...
Authors
N.M. Beeler, D.A. Lockner
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 115
A viscoelastic damage model with applications to stable and unstable fracturing A viscoelastic damage model with applications to stable and unstable fracturing
A viscoelastic damage rheology model is presented that provides a generalization of Maxwell viscoelasticity to a non-linear continuum mechanics framework incorporating material degradation and recovery, transition from stable to unstable fracturing and gradual accumulation of non-reversible deformation. The model is a further development of the damage rheology framework of Lyakhovsky et...
Authors
Yariv Hamiel, Yunfeng Liu, V. Lyakhovsky, Yehuda Ben-Zion, David Lockner
High-pressure rock-physics laboratories investigate earthquake processes High-pressure rock-physics laboratories investigate earthquake processes
No abstract available.
Authors
C.A. Morrow, D.A. Lockner
Crystallographic controls on the frictional behavior of dry and water-saturated sheet structure minerals Crystallographic controls on the frictional behavior of dry and water-saturated sheet structure minerals
We compare the frictional strengths of 17 sheet structure mineral powders, measured under dry and water-saturated conditions, to identify the factors that cause many of them to be relatively weak. The dry coefficient of friction μ ranges upward from 0.2 for graphite, leveling off at 0.8 for margarite, clintonite, gibbsite, kaolinite, and lizardite. The values of μ (dry) correlate...
Authors
Diane E. Moore, D.A. Lockner
The coefficient of friction of chrysotile gouge at seismogenic depths The coefficient of friction of chrysotile gouge at seismogenic depths
We report new strength data for the serpentine mineral chrysotile at effective normal stresses, σn between 40 and 200 MPa in the temperature range 25°-280°C. Overall, the coefficient of friction, μ (= shear stress/effective normal stress) of water-saturated chrysotile gouge increases both with increasing temperature and σn, but the rates vary and the temperature-related increases begin...
Authors
Diane E. Moore, D.A. Lockner, H. Tanaka, K. Iwata
Anisotropic changes in P-wave velocity and attenuation during deformation and fluid infiltration of granite Anisotropic changes in P-wave velocity and attenuation during deformation and fluid infiltration of granite
Fluid infiltration and pore fluid pressure changes are known to have a significant effect on the occurrence of earthquakes. Yet, for most damaging earthquakes, with nucleation zones below a few kilometers depth, direct measurements of fluid pressure variations are not available. Instead, pore fluid pressures are inferred primarily from seismic-wave propagation characteristics such as Vp...
Authors
S. A. Stanchits, D.A. Lockner, A.V. Ponomarev
Why earthquakes correlate weakly with the solid Earth tides: Effects of periodic stress on the rate and probability of earthquake occurrence Why earthquakes correlate weakly with the solid Earth tides: Effects of periodic stress on the rate and probability of earthquake occurrence
We provide an explanation why earthquake occurrence does not correlate well with the daily solid Earth tides. The explanation is derived from analysis of laboratory experiments in which faults are loaded to quasiperiodic failure by the combined action of a constant stressing rate, intended to simulate tectonic loading, and a small sinusoidal stress, analogous to the Earth tides. Event...
Authors
N.M. Beeler, D.A. Lockner