The explosion in GIS usage in marine disciplines such as active tectonics has revolutionised our ability to visualise, analyse, and interpret seafloor environments using multiple datasets and a much more “holistic” view of geologic/geophysical data than previously available. Driven by the growing capabilities of desktop workstations, we can now realistically expect to display, merge, and fly th...

The present research aims to explicate the tectonics of northwest Himalayas, Pakistan, based on integrated gravity, magnetic and earthquake data. raw gravity data were processed, seven isoanomaly maps prepared for qualitative interpretation, whereas a model was along selected profile quantitative interpretation. local have also been used identify various seismogenic layers in subsurface underst...

Plate tectonics is largely responsible for material and heat circulation in Earth, but for unknown reasons it does not exist on Venus. The strength of planetary materials is a key control on plate tectonics because physical properties, such as temperature, pressure, stress, and chemical composition, result in strong rheological layering and convection in planetary interiors. Our deformation exp...

The realization that Earth may have lost heat more slowly in the past than at present has motivated the search for mechanisms to reduce the efficiency of plate tectonics in the past. Several mechanisms have been proposed, such as the resistance to subduction of thick plates (1) produced by deeper melting at higher mantle temperatures (2). We (3) proposed an alternative mechanism, namely subduct...

The evolution of Mars has been greatly influenced by temporal changes in its rheological structure, which may explain the difference in tectonics between Mars and Earth. Some previous studies have shown the rheological structures of Mars calculated from the flow law of rocks and the predicted thermal structure. However, the Peierls mechanism, which is the dominant deformation mechanism at relat...

background: indoor radon gas (222rn) has been recognized as one of the health hazards for human. air radon comes mainly from basement soil and construction materials. saghand region with rich uranium mines lies 180 km from yazd, so the indoor radon concentration can be high. yazd, with population of about 457000, is the biggest city near saghand, thus, indoor gamma background radiation of yazd ...

Plate tectonics is a kinematic description of Earth that treats the outer shell of its mantle as a number of plates or rigid spherical caps that move with respect to each other (see the “Plate tectonics” sidebar). The mantle is the outer, solid 3,000-km-thick shell that overlies Earth’s fluid outer core. An enormous amount of geological and geophysical data has gone into determining the motion ...