David A Lockner
David Lockner is a geophysicist in the Earthquake Science Center.
Science and Products
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San Andreas Fault Zone mineralogy, geochemistry, and physical properties from SAFOD cuttings and core San Andreas Fault Zone mineralogy, geochemistry, and physical properties from SAFOD cuttings and core
No abstract available.
Authors
J. G. Solum, S. Hickman, D.A. Lockner, S. Tembe, J.P. Evans, S. D. Draper, D. C. Barton, D. L. Kirschner, J. Chester, F. M. Chester, B.A. van der Pluijm, A. M. Schleicher, Diane E. Moore, Carolyn A. Morrow, K. R. Bradbury, W. M. Calvin, T.-F. Wong
Physical properties of two core samples from Well 34-9RD2 at the Coso geothermal field, California Physical properties of two core samples from Well 34-9RD2 at the Coso geothermal field, California
The Coso geothermal field, located along the Eastern California Shear Zone, is composed of fractured granitic rocks above a shallow heat source. Temperatures exceed 640 ?F (~338 ?C) at a depth of less than 10000 feet (3 km). Permeability varies throughout the geothermal field due to the competing processes of alteration and mineral precipitation, acting to reduce the interconnectivity of...
Authors
C.A. Morrow, D.A. Lockner
Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole
Washed cuttings provide a continuous record of the rocks encountered during drilling of the main hole of the San Andreas Fault Observatory at Depth (SAFOD). Both protolith and fault rocks exhibit a wide variety of mineral assemblages that reflect variations in some combination of lithology, P-T conditions, deformation mechanisms, and fluid composition and abundance. Regions of distinct
Authors
J.G. Solum, S.H. Hickman, D.A. Lockner, Diane E. Moore, B.A. van der Pluijm, A.M. Schleicher, J.P. Evans
Frictional strength of cuttings and core from SAFOD drillhole phases 1 and 2 Frictional strength of cuttings and core from SAFOD drillhole phases 1 and 2
We investigated the frictional properties of drill cuttings and core obtained from 1.85-3.1 km true vertical depth in the SAFOD scientific borehole in central California. Triaxial frictional sliding experiments were conducted on samples from primary lithologic traits and significant shear zones, including the inferred active trace of the San Andreas fault. The samples were deformed at...
Authors
S. Tembe, D.A. Lockner, J.G. Solum, C.A. Morrow, T.-F. Wong, Diane E. Moore
Fracture in Westerly granite under AE feedback and constant strain rate loading: Nucleation, quasi-static propagation, and the transition to unstable fracture propagation Fracture in Westerly granite under AE feedback and constant strain rate loading: Nucleation, quasi-static propagation, and the transition to unstable fracture propagation
New observations of fracture nucleation are presented from three triaxial compression experiments on intact samples of Westerly granite, using Acoustic Emission (AE) monitoring. By conducting the tests under different loading conditions, the fracture process is demonstrated for quasi-static fracture (under AE Feedback load), a slowly developing unstable fracture (loaded at a 'slow'...
Authors
B.D. Thompson, R.P. Young, D.A. Lockner
Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite
To investigate laboratory earthquakes, stick-slip events were induced on a saw-cut Westerly granite sample by triaxial loading at 150 MPa confining pressure. Acoustic emissions (AE) were monitored using an innovative continuous waveform recorder. The first motion of each stick slip was recorded as a large-amplitude AE signal. These events source locate onto the saw-cut fault plane...
Authors
B.D. Thompson, R.P. Young, D.A. Lockner
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 115
San Andreas Fault Zone mineralogy, geochemistry, and physical properties from SAFOD cuttings and core San Andreas Fault Zone mineralogy, geochemistry, and physical properties from SAFOD cuttings and core
No abstract available.
Authors
J. G. Solum, S. Hickman, D.A. Lockner, S. Tembe, J.P. Evans, S. D. Draper, D. C. Barton, D. L. Kirschner, J. Chester, F. M. Chester, B.A. van der Pluijm, A. M. Schleicher, Diane E. Moore, Carolyn A. Morrow, K. R. Bradbury, W. M. Calvin, T.-F. Wong
Physical properties of two core samples from Well 34-9RD2 at the Coso geothermal field, California Physical properties of two core samples from Well 34-9RD2 at the Coso geothermal field, California
The Coso geothermal field, located along the Eastern California Shear Zone, is composed of fractured granitic rocks above a shallow heat source. Temperatures exceed 640 ?F (~338 ?C) at a depth of less than 10000 feet (3 km). Permeability varies throughout the geothermal field due to the competing processes of alteration and mineral precipitation, acting to reduce the interconnectivity of...
Authors
C.A. Morrow, D.A. Lockner
Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole
Washed cuttings provide a continuous record of the rocks encountered during drilling of the main hole of the San Andreas Fault Observatory at Depth (SAFOD). Both protolith and fault rocks exhibit a wide variety of mineral assemblages that reflect variations in some combination of lithology, P-T conditions, deformation mechanisms, and fluid composition and abundance. Regions of distinct
Authors
J.G. Solum, S.H. Hickman, D.A. Lockner, Diane E. Moore, B.A. van der Pluijm, A.M. Schleicher, J.P. Evans
Frictional strength of cuttings and core from SAFOD drillhole phases 1 and 2 Frictional strength of cuttings and core from SAFOD drillhole phases 1 and 2
We investigated the frictional properties of drill cuttings and core obtained from 1.85-3.1 km true vertical depth in the SAFOD scientific borehole in central California. Triaxial frictional sliding experiments were conducted on samples from primary lithologic traits and significant shear zones, including the inferred active trace of the San Andreas fault. The samples were deformed at...
Authors
S. Tembe, D.A. Lockner, J.G. Solum, C.A. Morrow, T.-F. Wong, Diane E. Moore
Fracture in Westerly granite under AE feedback and constant strain rate loading: Nucleation, quasi-static propagation, and the transition to unstable fracture propagation Fracture in Westerly granite under AE feedback and constant strain rate loading: Nucleation, quasi-static propagation, and the transition to unstable fracture propagation
New observations of fracture nucleation are presented from three triaxial compression experiments on intact samples of Westerly granite, using Acoustic Emission (AE) monitoring. By conducting the tests under different loading conditions, the fracture process is demonstrated for quasi-static fracture (under AE Feedback load), a slowly developing unstable fracture (loaded at a 'slow'...
Authors
B.D. Thompson, R.P. Young, D.A. Lockner
Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite Observations of premonitory acoustic emission and slip nucleation during a stick slip experiment in smooth faulted Westerly granite
To investigate laboratory earthquakes, stick-slip events were induced on a saw-cut Westerly granite sample by triaxial loading at 150 MPa confining pressure. Acoustic emissions (AE) were monitored using an innovative continuous waveform recorder. The first motion of each stick slip was recorded as a large-amplitude AE signal. These events source locate onto the saw-cut fault plane...
Authors
B.D. Thompson, R.P. Young, D.A. Lockner