Seismic activity effect on turbulence development in Es sporadic layer of the ionosphere

• download

The paper presents the analysis of E_s sporadic layer frequency
   parameters, i.e. translucency range and coefficient during earthquake
   preparation. The investigation was carried out on the basis of ionograms,
   in the first place, obtained by ionosphere vertical sounding method at
   Dushanbe station at nighttime on August 15-29, 1986. Within this period
   four successive earthquakes occurred that corresponds to the aim of the
   present paper on seismic processe effect on the intensity of continuous
   ionospheric turbulence. The duration of seismo-ionospheric precursor
   manifestation in Dushanbe is supposed to be associated with deformation
   processes in the Earth crust and different faults as well as with
   different properties of epicentral zone media.

   It has been shown that for the earthquakes with М > 4.5-6.0 the increase
   of E_s translucency range value and the growth of  E_s
   inhomogeneity degree are observed two or three days before an event, that
   leads to the appearance of inhomogeneity intensity in E_s sporadic
   layer of the ionosphere. It has been established that the changeability of
   translucency range and E_s ranslucency coefficient during seismic
   activity may be associated with turbulence phenomena in E_s sporadic
   layer of the ionosphere. Dynamic development of turbulence during seismic
   activity is caused by acoustic and acoustic-gravitational waves.