T he Bight Basin is a major frontier basin of Jurassic–Cretaceous age, which is currently undergoing renewed exploration interest. Although only limited data is available for understanding the petroleum systems in the basin, several observations indicate that poor fault seal integrity may represent a key exploration risk. The presence of a paleo-oil column in the Jerboa-1 well, interpreted gas ...

Secondary seismic radiation is generated by rock fracture in the "damage zone" of an underground nuclear source and by frictional sliding on preexisting fractures in the "non-linear elastic zone" at larger distances from the shot point. This radiation is important for two reasons: (1) Johnson and Sammis [2000] have shown that it can make an important contribution to the far-field seismic signal...

[1] The rates and spatial distribution of active deformation provide critical constraints on the geodynamics of deforming lithosphere, yet such data are often difficult to acquire in eroding landscapes where poor preservation of geomorphic or stratigraphic markers hinders strain reconstruction. Recent advances in understanding of the relationship between bedrock channel profile form and erosion...

In two separate shallow field experiments, at two distance scales, we have used continuous monitoring to estimate the effect of barometric pressure on crosswell travel time and thereby calibrated the stress sensitivity of the rock volume between the wells. In a 3 m experiment we found a stress sensitivity of 10/Pa while in a 30 m experiment the sensitivity was 5 x 10 /Pa. Results from a deeper ...

A casting technique has betn developed for ding translucent replicas of the void space of natural rock measurui by means of light attenuation. Digital h g e analysis yields a virtuatly pointwise definition of fracture am. The casting technique for muring fratfractures. Amnuation of light &n& through the cast combin& with digital image analysis a pointtWe Wid space geometry has evaluated by comp...

Physical modeling of earthquake generation processes is essential to further our understanding of seismic hazard. However, the scale-dependent nature of earthquake rupture processes is further complicated by the heterogeneous nature of the crust. Despite significant advances in the understanding of earthquake generation processes, and the derivation of underlying physical laws, controversy rema...

Iqbal and Toor [Phys. Rev. A 65, 022306 (2002)] and [Commun. Theor. Phys. 42, 335 (2004)] generalized the Marinatto-Weber quantum scheme for 2×2 games in order to study bimatrix games of 3×3 dimension, in particular the Rock-Paper-Scissors game. In our paper we show that Iqbal and Toor’s generalization exhibits certain undesirable property that can considerably influence the game result. To sup...

introduction agates are presumed as a kind of precious stone that could be formed in magmatic, metamorphic and even sedimentary environment. mechanism for agate formation is not clear and is produced in laboratories. some hot springs and geothermal activity or white chimneys in the ocean floor, have some deposits like chalcedony but never produce agate. agate formation temperature varies betwee...