[1] Shaking-induced changes in permeability have been invoked to explain a wide range of hydrologic responses to earthquakes. We measure the evolution of permeability in fractured sandstone in response to repeated shaking under undrained conditions. The frequency and amplitude of the imposed shaking are similar to those from earthquakes at distances of a fault length from the ruptured fault. To...

It is of interest in various scientific and industrial contexts to make a reliable estimation of the transport properties of porous media via more accessible probes such as NMR that yield information on static pore geometry and porosity. When the pore geometry is simple, there are empirical recipes that have long proven reliable in bridging the gap. For heterogeneous systems, such recipes fail ...

A fast, sensitive method for extraction and analysis of soluble free amino acids from microbially colonized sandstone is described. After precolumn phenyl isothiocyanate (PITC) derivatization, the PITC-amino acids were identified and quantified by reversed-phase high-performance liquid chromatography. This kind of analysis could be used to elucidate the role and function of amino acids in the n...

Phaeostemma surinamensis Morillo & Krings, sp. nov., anew species of Apocynaceae (Asclepiadoideae, Gonolobinae) is described and illustrated, and the new combination Phaeostemma fucata (Woodson) Morillo & Krings, comb. nov., is made. The new species, known only from a lowland wet forest of Suriname, seems to be closely related to Phaeostemma fucata, which is an endemic to Ptari-tepui, a sandsto...

A new method is used to quantify the relationships between stress field and primary fracture characters (aperture, density) in low-permeability sandstone reservoirs based on laboratory experiments and mathematical development, through which, quantitative fracture modeling is set up. Using this modeling, we can load it into the stress analysis software (Ansys 10.0) to acquire 3D palaeo stress fi...

The paper is concerned with the fractional extension of the Lauwerier formulation of the problem related to the temperature field description in a porous medium (sandstone) saturated with oil (strata). The boundary value problem for the fractional heat equation is solved by means of the Caputo differintegration operator D ∗ of order 0 < α ≤ 1 and the Laplace transform. The solution is obtained ...

the present study was carried out to determine the possible origins of sediments entering taleghan dam in northern part of iran, in order to avoid further sedimentation and helping in extension of the useful life of the proposed dam. this was performed by xrd analysis. to do so, first of all, sediment sampling points were positioned along the taleghan river. the collected samples, after coding,...

SANDSTONE OF LOW-T SPRING ORIGIN. J. L. Berkley, Department of Geosciences, SUNY Fredonia, Fredonia, NY 14063 and Kaitlyn Dykstra, Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213. Introduction: Detailed petrological analysis of a dark black to dark brown conglomeratic sandstone in southwestern New York State shows that its cementing agent is composed mainly o...