CRUSTAL DYNAMICS, GENESIS OF EARTHQUAKE VIS-À-VIS PRECURSORY SIGNALS ATTRIBUTE  Fulltext 

[ Aftab Alam Khan ] - Professor, Department of Geology, University of Dhaka, Dhaka-1000, Bangladesh

خلاصه مقاله:

The genesis of earthquake is intrinsically related to crustal dynamics. The occurrence and distribution of this natural event follow with the status of crustal dynamics. In order to minimize the impact of destructions due to impending earthquakes under the prevailing socio-economic constraints, earthquake forecasting through the use of earthquake precursory signals detection and characterization could be achieved. A great majority of earthquakes occur almost with certainty in and around the regions of plate subduction. However, earthquakes with utmost devastations and miseries are largely located in and around the intraplate continental suture zones and to less extent around the plate subduction. The geodynamic processes responsible for leaking and channeling of stress energy from source nucleus into non-seismic propagation to seismic propagation through pseudo-seismic propagation prior to brittle failure are suggested. The non-seismic precursory signals may be looked from quantum tunneling phenomenon point of view. A relation between geodynamic process and the electron wave propagation
through quantum tunnel is proposed. Since the significant electrical conductivity in rocks and minerals is caused by ionic conductivity needs high temperature to contribute to the transport phenomenon, it is logically assumed that a nucleus of dislocation of defect electrons is formed at the viscous creep interfaces. Two physical status of the nucleus of dislocation are proposed viz., pseudo-plastic power law for pseudo-seismic propagation at the frictional – viscous zone, and the generation of p-holes of defect electrons in the viscous creep zone at every interface of the different viscosity status. The generation of pholes charge carrier of earthquake triggering nucleus at shallow depths is possible in the region of thin crust with upwelling mantle plume. Since a fault rupture is the ultimate cause of a disastrous effect response of an earthquake, it is warranted that further research should be initiated around some active faults for documentations of non-seismic, pseudo-seismic, and seismic signals, its characterization, and correlation.