We studied the isotropic ball using data of Preliminary Reference Earth Model (PREM). It is shown that such a ball should be either destructed or gone into a more stable equilibrium state with uneven distributed deformation under thermobaric condition of the inner core. Body elastic waves with real velocities cannot propagate in it. This manuscript is devoted to study the situation from the standpoint of nonlinear geomechanics. A number of necessary principles of Mechanics of Deformable Solid Body (MDSB) is given at the beginning of the analysis. A brief review of the published latest experimental work is performed. It is established that proper attention to the role of the MDSB principles in micro‐scale (nano) experiments of the physical level has not been given. Deformation properties of solid bodies are emphasized in microscale and macroscale. Application of linear acoustoelasticity and extrapolation of Birch's linear law of the inner core and use of an idea on variability of elasticity moduli with the increase of pressure and temperature have contributed to obtained pseudo data for the geological medium of the Earth's core instead of linear data on the physicomechanical properties. It is proposed that parallel to elimination of the indicated disadvantages, collection, processing and interpretation should be performed using nonclassically linearized approach. This set of necessary actions is offered as the “key” of geomechanical analysis. The proper application will allow conducting similar analysis concerning other solid‐state structures of the Earth.
Quaternary convergence at rates of ~10 mm/yr between the
Arabian and Eurasian plates is largely accommodated by the Kura
fold-thrust belt at the longitude of the Greater Caucasus Mountains in
Azerbaijan and eastern Georgia. Here we present the results of the first
paleoseismic study of the Kura fold-thrust belt in Azerbaijan. A single
paleoseismic trench was excavated across a 2-m-high fault scarp near
Agsu revealing evidence of two recent surface rupturing earthquakes.
Radiocarbon dating of the faulted sediments places limits of earthquake
timing of AD 1713-1895 and AD 1872-2003 for the two events. Allowing for
uncertainties in radiocarbon dating, the two events likely correspond to
historical destructive M~7 earthquakes near Shamakhi,
Azerbaijan in AD 1668 and 1902. Holocene shortening and dip-slip rates
for the Kura fold-thrust belt are 8 and 8.5 mm/yr, respectively, based
on the depositional age of an abandoned uplifted strath terrace in a
water gap to the west of Agsu. These rates should be treated as maxima,
as they are ~100% of the previously determined
structurally and geodetically measured shortening across the belt, and
were measured from only one of two primary structures in this part of
the belt. The lack of reported historical ruptures from the past 8
centuries to the west of Agsu, in contrast with the numerous recorded
destructive earthquakes of the Shamakhi region, suggests that the
central and western parts of the Kura fold-thrust belt produce less
frequent, but more destructive earthquakes, and may have accumulated
sufficient strain to produce a M>8 earthquake.
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