Interrelation of conductivity, seismic velocities and the seismicity for Central Tien Shan lithosphere

2015

Литосфера, Vol 0, Iss 5, Pp 81-89 (2015)

The work is devoted to investigation of the deep structure of the Central Tien Shan lithosphere. Comparative analysis of seismic tomography models and results of interpretation of magnetotelluric and magnetovariational soundings along “NARYN” (76°E.) profile, allowed to establish a correlation of velocity features and electrical properties of the Earth’s crust: a) corresponding of zones high conductivity to zones of low seismic velocities; b) low conductivity zones are the areas of high seismic velocities; c) high seismic velocities characterize massif of eclogites detected as a result of complex interpretation of geological and geophysical data. The vast majority of hypocenters seismic events with energy class K > 9 is limited to a depth of 25 km and is located within or near the boundaries of high-resistivity blocks geoelectric model, where the electrical resistivity is 103-104 Ω·m. Quantity of cracks and aqueous fluids in these high-resistance blocks seems not sufficient for the formation of through conductive network. Consequently, they are rigid and able to accumulate the elastic energy for realization of the seismic process.

article

English
Russian

A.N. Zavaritsky Institute of Geology and Geochemistry, 2015.

земная кора, кажущееся электрическое сопротивление, геодинамика, ceйсмология, сейсмотомография, сейсмическая активность, Earth’s crust, apparent electrical resistance, geodynamics, seismology, seismic tomography, seismic activity, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712