RESEARCH FOCUS: Connections between fault roughness, dynamic weakening, and fault zone structure
نویسندگان
چکیده
منابع مشابه
Dynamic Fault Weakening and Strengthening by Gouge Compaction and Dilatancy in a Fluid-Saturated Fault Zone
Triaxial experiments show that samples of fault gouge deform distinctly differently than those from the adjacent fault damage zone (e.g., Chester and Logan, 1986). Rock samples in the damage zone follow a characteristic elastic-brittle behavior, whereas fault gouge readily compacts and deforms in a more ductile manner. In order to explain the apparent weakness of large plate bounding faults suc...
متن کاملFrictional strength and strain weakening in simulated fault gouge: Competition between geometrical weakening and chemical strengthening
[1] Despite the importance of hydromechanical effects in fault processes, not much is known about the interplay of chemical and mechanical processes, in part because the conditions are difficult to simulate in the laboratory. We report results from an experimental study of simulated fault gouge composed of rock salt sheared under conditions where pressure solution is known to operate. At slidin...
متن کاملShear heating of a fluid-saturated slip-weakening dilatant fault zone 1. Limiting regimes
[1] The one-dimensional model of Rudnicki and Chen [1988] for a slip-weakening dilating fault is extended to include shear heating. Because inertia is not included, instability (a seismic event) corresponds to an unbounded slip rate. Shear heating tends to increase pore pressure and decrease the effective compressive stress and the resistance to slip and consequently tends to promote instabilit...
متن کاملShear heating of a fluid-saturated slip-weakening dilatant fault zone: 2. Quasi-drained regime
[1] This paper analyzes slip on a fluid-infiltrated dilatant fault for imposed (tectonic) strain rates much slower than the rate of fluid exchange between the gouge zone and the surroundings and for exchange of heat slower than of fluid, typical of interseismic or most laboratory loading conditions. The limiting solution, corresponding to the infinitely rapid drainage rate, developed in the com...
متن کاملLow-velocity damaged structure of the San Andreas Fault at Parkfield from fault zone trapped waves
[1] We used dense linear seismic arrays across and along the San Andreas Fault (SAF) at Parkfield, California to record fault zone trapped waves generated by explosions and microearthquakes in 2002. Prominent trapped waves appeared at stations close to the SAF main fault trace while some energy was trapped in the north strand at the array site. Observations and 3-D finitedifference simulations ...
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ژورنال
عنوان ژورنال: Geology
سال: 2015
ISSN: 0091-7613,1943-2682
DOI: 10.1130/focus012016.1