[1] Recent theoretical models suggest that topographic characteristics of bedrock channels are products of interactions among tectonics, substrate resistance, and the climatically modulated erosive ability of the river. The degree to which these factors influence the form of channel profiles is poorly quantified at present. Here we investigate bedrock channels developed across the southern flan...

Using some new processing of the multichannel sonic (MCS) log data from Site 418A, the resulting P, S, and Stoneley wave velocity estimates and apparent attenuation were integrated with the natural gamma, spectral gamma, resistivity, neutron, density, and caliper logs and core lithology information for interpretation of lithologic cycles and possible paleo fluid flow intervals. These data indic...

As a rule all oil fields in East Siberia are confined to local heterogeneous lithologic substitution. These areas usually possess higher level of fracturing and besides of reflected waves generate scattered ones with rather high amplitude. Both regularly reflected and diffracted/scattered waves should be used in order to get the proper seismic image of reservoirs structure: reflected waves fix ...

A fully automated method uses Landsat Thematic Mapper data to map snow cover in the Sierra Nevada and make quantitative estimates of the fractional snow-covered area within each pixel. We model winter and spring reference scenes as linear mixtures of image end member spectra to produce the response variables for tree-based regression and classification models. Decision trees identify cloud cove...

Earth's land surface teems with life. Although the distribution of ecosystems is largely explained by temperature and precipitation, vegetation can vary markedly with little variation in climate. Here we explore the role of bedrock in governing the distribution of forest cover across the Sierra Nevada Batholith, California. Our sites span a narrow range of elevations and thus a narrow range in ...

Outcrops of columnar joints made solidified lava flows are often covered by semiordered polygonal cracks. The polygon diameters fairly uniform at each outcrop, but their shapes largely vary in the number sides and internal angles. Herein, we unveil that statistical variation shape follows an extreme value distribution class: Gumbel distribution. law was found to hold for different joints, regar...

3D seismic and petrophysical log data interpretation of reservoir sands in “SIMA” Field, onshore Niger Delta has been undertaken this study to ascertain the characteristics terms favourable structural parameters suitable for hydrocarbon accumulation entrapment field. Horizon fault were carried out subsurface delineation. In all, seven faults (five normal two listric faults) mapped section. Thes...