Seamounts make earthquakes

Article Abstract:

Large earthquakes are possibly caused due to shearing of isolated mountains (seamounts) in subduction zones of the ocean. The position of seamount decapitation determines the magnitude of the earthquake. Asperities are strong areas of the plate interface that control earthquake occurrences. They are made from the subducted seamounts and are affected by sea floor roughness and style of sediment subduction. The size of earthquakes varies between subduction zones probably due to the absolute velocity of the overlying plate that affects the speed of subduction.

Causes of, Earthquakes, Seamounts, Subduction zones (Geology), Subduction zones

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Earthquakes with gold linings

Article Abstract:

Large earthquakes change fluid flow patterns on the earth's surface. These cause a fluid which is normally miscible to separate and precipitate gold. Vein minerals in fault planes may develop due to changes in fluid pressure in the fault plane between low, approximate hydrostatic, values, and values approximate to lithostatic pressure. However, gold deposition also occurs from a single-phase fluid due to a temperature decrease or due to changes in oxidation-reduction conditions.

Natural history, Geodynamics, Gold ores

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Probe of a plate interior: Earth science

Article Abstract:

Reports of the German Continental Deep Drilling Program (KTB) have not been widely circulated, but a special set of papers, aims to bring the work to a broader audience. The work aims to find out more about the the Earth's crystalline continental crust, based on geological data bearing on the development of the Variscan orogen in central Europe, and geophysical data about the current state of the Earth's crust in a stable plate interior.

Research, Earth Science (Periodical)

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