R. Summers

Publications33
h-index14
Citations855
Highly Influential Citations30
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Strength of chrysotile-serpentinite gouge under hydrothermal conditions: Can it explain a weak San Andreas fault?
Chrysotile-bearing serpentinite is a constituent of the San Andreas fault zone in central and northern California. At room temperature, chrysotile gouge has a very low coefficient of friction (μ ≈… Expand
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Effects of temperature and sliding rate on frictional strength of granite
Layers of artificial granite gouge have been deformed on saw-cut granite surfaces inclined 30° to the sample axes. Samples were deformed at a constant confining pressure of 250 MPa and temperatures… Expand
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Laboratory measurements of reservoir rock from the Geysers geothermal field, California
Rock samples taken from two outcrops, as well as rare cores from three well bores at the Geysers geothermal field, California, were tested at temperatures and pressures similar to those found in the… Expand
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Sliding behavior and deformation textures of heated illite gouge
Abstract The run products of a series of triaxial friction experiments on an illite-rich gouge have been examined petrographically to study the relationship between textural development and sliding… Expand
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Tidal migrations in the flounder (Platichthys flesus)
In estuaries, flounders move onto mudflats with the flood tide, feed extensively, and move off the flats as the tide recedes. Sizes of flounder visiting the mudflats of the Ythan estuary,… Expand
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A note on the effect of fault gouge composition on the stability of frictional sliding
Abstract The frictional properties of fault gouge have been studied at confining pressures to 6 kbars. If the gouge is composed of strong materials such as crushed granite or quartz sand, the… Expand
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How do Purple Sandpipers Calidris maritima survive the winter north of the Arctic circle
Winter north of the Arctic circle in northern Norway is colder, windier and there is less solar radiation than in eastern Scotland, at a latitude 13 degrees further south. We predicted from equations… Expand
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Stress and Permeability Heterogeneity within the Dixie Valley Geothermal Reservoir: Recent Results from Well 82-5
We collected borehole televiewer, temperature and flowmeter logs and conducted a hydraulic fracturing test in a well (82-5) that penetrated the SFZ within the known boundaries of the geothermal field… Expand
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A note on the effect of fault gouge thickness on fault stability
Abstract At low confining pressure, sliding on saw cuts in granite is stable but at high pressure it is unstable. The pressure at which the transition takes place increases if the thickness of the… Expand
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The effects of sliding velocity on the frictional and physical properties of heated fault gouge
The frictional properties of a crushed granite gouge and of gouges rich in montmorillonite, illite, and serpentine minerals have been investigated at temperatures as high as 600°C, confining… Expand
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