The internal structure and petrophysical property distribution of fault zones are commonly exceedingly complex compared to the surrounding host rock from which they are derived. This in turn produces highly complex fluid flow patterns which affect petroleum migration and trapping as well as reservoir behavior during production and injection. Detailed rendering and forecasting of fluid flow insi...

We perform a detailed parameter-space study on properties of yielding zones generated by 2-D in-plane dynamic ruptures on a planar fault with different friction laws and parameters, different initial stress conditions, different rock cohesion values, and different contrasts of elasticity and mass density across the fault. The focus is on cases corresponding to large strike-slip faults having hi...

-The internal properties within and adjacent to fault zones are reviewed, principally on the basis of laboratory, borehole, and seismic refraction and reflection data. The deformation of rocks by faulting ranges from intragrain microcracking to severe alteration. Saturated microcracked and mildly fractured rocks do not exhibit a significant reduction in velocity, but, from borehole measurements...

There are increasing amounts of evidence that earthquake rupture is a mixed process between what is called frictional slip failure and fracture of intact rock mass. In fact, there is a strong possibility that what is called a 'barrier' or 'asperity' on earthquake faults is a local patch of high rupture growth resistance whose strength equals the strength of intact rock. In addition, the lithost...

The stochastic method of simulating ground motions from finite faults is validated against strong-motion data from the M 6.7 1994 Northridge, California, earthquake. The finite-fault plane is subdivided into elements, each element is assigned a stochastic o92 spectrum, and the delayed contributions from all subfaults are summed in the time domain. Simulated horizontal acceleration time historie...

We carried out geochemical and mineralogical analyses on fault-zone rocks from the Anko section of the Median Tectonic Line in Nagano Prefecture, Japan, to investigate coseismic physicochemical processes in the fault zone. The latest fault zone in the Anko section contains cataclasite, fault breccia, and fault gouge of granitic composition, and brecciated basic schist. Protoliths of the graniti...

Based on the observation of geochemical characteristics 19 hot springs in Litang Fault Zone (LFZ) from 2010 to 2019, major elements, trace and stable isotopes were investigated, a conceptual model ground fluid circulation LFZ was established. The main hydrochemical type spring water samples is HCO3−-Na+. δ2H values range −157.6‰ −123.4‰ δ18O −24.5‰ −15.4‰. fault zone mainly recharged by infiltr...