Tephra layers in marine sediment cores from scientific ocean drilling largely record high-magnitude silicic explosive eruptions in the Japan arc for up to the last 20 million years. Analysis of the thickness variation with distance of 180 tephra layers from a global data set suggests that the majority of the visible tephra layers used in this study are the products of caldera-forming eruptions ...

America). By drilling, coring and analyzing stratigraphic. By drilling, coring and analyzing stratigraphic By drilling, coring and analyzing stratigraphic By drilling, coring and analyzing stratigraphic y drilling, coring and analyzing stratigraphic archives along the Antarctic continental margin, ANDRILL , ANDRILL pursues its primary goal of better understanding the role the primary goal of be...

Purpose is to determine a function of the reduced expenditures connected with drilling-and-blasting operations, loading and hauling rock fragmentation depending upon cost machine-shift applied facility, its operation modes, hardness being blasted, used explosive, quality based developed optimization mathematical model. Methods. Method statistical evaluation natural blockiness structure as well ...

Abstract Underground quarrying is rarely adopted for granite extraction due to the difficulties in implementation of traditional technologies ( drilling and explosive) . As alternative explosive , combination diamond wire water jet seems be most promising available technology. The cutting performance achievable with technology depends on operative parameters, material characteristics state stre...

The San Andreas Fault Observatory at Depth provides the most comprehensive set of data on the structure and dynamics of the San Andreas fault. We use two independent experiments recorded by the seismometer arrays of the SAFOD Pilot and Main Holes to resolve the localized structure of the San Andreas fault zone and of an intermediate fault zone at depth. From Pilot Hole recordings of the drillin...

Fluids are present throughout Earth’s crust and act as a primary medium of exchange between Earth’s interior lithosphere and hydrosphere Flowing fluids carry enormous fluxes of energy magma and solutes be tween these reservoirs Fluids contribute to production of continental crust generation of explosive volcanism lubrication of plate boundary faults formation of hydrates and mineral resources a...