Rebetsky Yuriy Leonidovich

Head of laboratory

Education

In 1975 was graduated at V.V. Kuybushev Moscow Construction Engineering Institute (MICI), Industrial and Civil Engineering department, class "Structural theory" (tutors:d. techn. sc.A.C. Grigorjev, d. techn. sc. B.G. Korenev, d. techn. sc. A.R. Rzhanitsyn, d. techn. sc. A.V.Luzhin).

From 1978 to 1981 studied postgraduate course V.V. Kuybushev MICI at department "Elasticity theory" under the direction of d. techn. sc., prof. A.C. Grigorjev.

Defence of theses

In 1982 at doctoral council at V.V. Kuybushev MICI defended candidate’s thesis. Awarded a degree candidate technical sciences.

In 2003 at doctoral council at O.JU.Schmidt IPE RAS defended doctoral thesis «Deflected mode and mechanical properties of natural massifs due to data about earthquake sources mechanisms and structural-kinematic characteristics of faults». Awarded a degree doctor physical-mathematical sciences.

Professional advance

From 1975 to 1978 by distribution after graduating at MISI worked at positions foreman, head foreman and section foremaster in trust "Builder" GlavMosStroy USSR.

In 1978 entered postgraduate course at V.V. Kuybushev MICI at department "Elasticity theory".

In 1981 after finishing postgraduate course was accepted for employment in O.JU. Schmidt IPE RAS in the laboratory "Tectonophysics" on position younger scientist.

In 1989 was nominated on position head of laboratory "Tectonophysics".

From 1996 to 2001 leaded Computing Center IPE RAS.

From 1994 to 2001 by order of director IPE RAS acad. V.N. Strachov leaded by creating of integrated computer net (CN) of institute. If in the beginning of 90-th in laboratories were single computers working by OS DOS, but in process of creating CN more than 200 computers IPE RAS were conversion to OS WINDOWS. Such conversion demanded re-teaching of users, which executed by laboratory of tectonophysics team.

In 2008 organized holding regular (quadrennial) all-russian tectonophysical conference at IPE RAS - "Tectonophysics and actual problems of geosciences".

Chairman of youth tectonophysical conference, hold from 2009 at IPE RAS biennial.

In 2013 organized holding monthly common Moscow tectonophysical seminar at IPE RAS.

From 2011 chairman of tectonophysical division "Counsel on Geotectonic and geodynamic problems" on BSE RAS.

Main direction of scientific research

1) The development of tectonophysics theoretical base.

А. Study of evolution of strain mode in folding region. (Fizika Zemli (Physics of Earth), 1995; Coll. Tectonofizika segodnia (Tectonophysics today), 2002). For this purpose was build decision for problem of viscous layer massif, crushed in chevron folds by outside force (axial compression folds). On the stratum contact dry friction took place, and layers corresponded interstratifying of competent and incompetent rocks. The result of solution was state equations, connected stress tensor and tensor of deformation rate for scales: a) streak bundles with the same properties on limbs of fold; b) fold limbs in whole, contained competent and incompetent streak bundle; c) fold in whole, included anticline and syncline limbs. It was also obtained evolution equation, defining velocity angle of limbs of fold slope changing as function of physical (viscosity, friction coefficient) and geometric (layer thickness) fold parameters. It was shown, that when modeling medium of the lowest scale level streaks may considered as linear-viscous Newton body, meanwhile on the level of whole fold state equations will correspond to non-linear viscous body, parameters of which defined by viscous tensor and depends on phase of deformation (deformative anisotropic viscous body).

B. Develops the ideas about influence of residual strains of gravitational strain mode (GSM) on increased horizontal compression stress level, appeared in the rise regions (Coll. Problemy tektonofiziki (Problems of tectonophysics), 2008; Fizicheskaia mezomekhanika (Physical mesomechanics), 2008; Doklady RAS, 2008). It was shown, that influence of Earth sphericity (see work Turcotte D.L., Oxburgh E.R., Nature, 1973) should not regard as factor, excluding residual stresses GSM influence, because in close proximity to rise (Karpinsky rule), that is denudation zones, is and develops deflection regions, in which sediment accumulation takes place (Geotektonika (Geotectonics), in print).

C. It was suggested, when the problem about mantle flow solves to take into account elastic compressibility influence on stresses mode (Geofizicheskiy zhurnal (Geophysical journal), 2010; Doklady RAS, 2011). It was shown, that taking into account elastic compression from mass force influence on mantle convection flows leads to resolving equation system, responds eigenvalue problem. Key parameter of this problem defines by elastic medium compressibility on the bottom of region, where flow occurs. The taking into account elastic compressibility, caused (GSM), leads to the appearance of addition horizontal compression stresses in zone of convection upwelling.

D. Develops views on revelation of energy source of tectonic process, conditional by internal factors. At the frame of these approaches pays attention on that fact, geophysical data about lithosphere structure shows, that standard medium model is layering with increased with depth elastic rigidity. In the lithosphere regions, where observes inversion with depth elastic rigidity (more rigid layer underlay less rigid one), observes increased seismic and tectonic activity. Earth crust wave conductors, as well as sediment basins are examples of such regions. It was shown, that elastic rigidity inversion caused failure to Lagrange principle of potential energy minimum (in this case the speech is about elastic energy of three-dimensional compression GSM), i. e. changing of deep order of layers (increasing elastic rigidity with depth) caused to decreasing of elastic energy GSM (Vestnik KRAUNTS (Bulletin KRATSC), 2013; Doklady RAS РАН, 2014; Geologia i Geofizika (Geology and Gtophysics), 2014).

E. Development of tectonophysical base of earthquake source study methodology (Geologia i Geofizika (Geology and Geophysics), 2006; Geofizicheskiy zhurnal (Geophysical journal), 2007; Bull. Soc. Geol. Fr., 2013). It was shown on examples of stress mode in powerful earthquakes regions analisys, that the eartquake preparation region corresponds with decreased level of uniform pressure. Start of fractures opening by earthquakes occurs in high level of stress gradient zones.

2) Development of tectonophysical methods of nature stresses study.

A. It was suggested for tectonic stress value estimation in seismically active regions to use data about principle stresses orientation, obtained by tectonophysical methods. It was suggested, for determining of unknowned values of pressure and maximum shear stress to use three equilibrium equations. . In this case solving problem become incorrectly formulated – demands finding of optimal decision by redundance of equation (Fizika Zemli (Physics of Earth), 1991).

B. Developed method of cataclastic analisys fracture displacement MCA, allowing to create algorithm for reconstruction of principal axis orientation and type of stress ellipsoid on the base of energy postulate of mechanics of plastic medium (J.Eearthquake Pred. Res., 1996; Doklady RAS, 1997, 1999; BMOIP (BMSIN), 2001). MCA should be considered as the progress of O.I.Goutschenko kinematic method and J. Anjelier cleavage inversion method. Without collaboration with them this method did not created.

C. Algorithm of stress value determining on the base of using experimental results on rock destruction, as well as seismological data about reduced stress in power earthquake source was suggested (Doklady RAS, 2003, 2009; Geofizicheskiy zhurnal (Geophysical journal), 2005, 2009).

3) Nature stress reconstruction in seismoactive regions of lithospheric plate boundary and intercontinental regions: High Asia and Oceania (J.Eearthquake Pred. Res., 1997; Geodinamika i Tektonofizika (Geodynamics and Tectonophysics), 2014); West flank of Sunda arch (Doklady RAS, 2006; Geologia i Geofizika (Geology and Geophysics), 2006); S. America, Plate Nazca (Fizika Zemli (Physics of Earth), 2001); Kuril and Kamchatka (Tikhookeanskaia Geologia (Pacific Geology), 2009); Syria (Vestnik KRAUNTS (Bulletin KRATSC), 2012); Altai and Satan (Coll. Problemy tektonofiziki (Problems of Tectonophysics), 2008; Geologia i Geofizika (Geology and Geophysics), 2012; Tectonophysics, 2012); North Tien Shan (Tectonophysics, 2012); East Mediterranean (Geodinamika i Tektonofizika (Geodynamics and Tectonophysics), 2014); Aftershock region of Altai earthquake (Geofizicheskie issledovania (Geophysical research), 2012); Aftershock region of Spitak earthquake 1988 (Doklady RAS, 2000); Preparation for Northridge earthquake region (Tektonicheskie napriazhenia i ...(Tectonic stress and…), 2007); Preparation for Wenquan earthquake 2008 region (Dizhen Dizhi, 2012); Preparation for Tohoku earthquake 2011 region (Geodinamika i Tektonofizika (Geodynamics and Tectonophysics), 2014) was executed. Research was made together with S.S. Arefiev, O.A. Kuchay, N.A. Sycheva, A.V. Marinin, A.Yu. Polets, R.S. Alekseev, H. Omar, K. Wang, R.E. Tatevosian, O.O. Ovcharenko, P.A. Savichev

4) Development of mathematical methods of tectonophysical stress and deformation study.

A. In frame of this direction analytic decision of mechanics problem for viscosity layer (sediment cover) in zone of basement rigid blocks horizontal shear was obtained (Polia napriageniy i deformatsiy v litosfere (Fields of stress and deformation in lithosphere, 1987; Fizika Zemli (Physics of Earth), 1988). On the base of this decision, together with A.S. Grigoriev and I.M. Volovich, was constructed semianalytic decision of problem about stresses and deformations, forming in sediment cover above crystal basement fracture for broad class of its kinematics: thrust – shear - fault (J. Geodynamics, 1988; Fizika Zemli (Physics of Earth), 1989). It was shown, that stress mode in horizontal shear changed with the death. Therewith such changing connects not only basement blocks shear itself, but also with influence of gravitational stress mode, caused by mass force. It was established (together with A.V. Mikhailova), that in the depth of horizontal shear zone changes kinematic type of brittle fracture (Coll. Problemy tektonofiziki (Problems of tectonophysics), 2008; Geodinamika i Tektonofizika (Geodynamics and Tectonophysics), 2011; Fizika Zemli (Physics of Earth), 2014).

B. Developed the approach (together with A.S. Lermontova) on approximate analytic decision of elasticity theory problem for sey of shear fracture with friction on its edges (Tektonofizika segodnia (Tectonophysics today), 2002; Doklady RAS, 2010; Geodinamika i Tektonofizika (Geodynamics and Tectonophysics), 2012). This approach allows instead of system of integral equations relative to unknown displacement jump on fracture turns problem into solving system of linear algebraic equations relative to unknown mean value of reduced stress.

C. Using calculus of approximations together with V.V. Pogorelov was researched patterns of stress distribution in the depth of subduction zones (Vestnik KRAUNTS (Bulletin KRATSC), 2010) and interplate regions of power earthquake sources (J.Earth Sys.Sc. 2008).

International co-operation and works abroad

In cooperation with Jacques Angelier, professor of Pierre and Mary Curie Paris University, guidance by E.S. Nikitina postgraduate course. Defence of a candidate’s thesis was in Paris University in 1997.

Study in cooperation with J. Angelier of modern and paleo stresses in North-Eastern Caucasus and Crimea crust (C.R. Acad. Sci.Paris, 1994, Geoscince, 2011).

Participation in works of seismological party IPE RAS, head S.S. Arefiev, in Iran in investigation of building nuclear power station “Bushehr” region in 1998 – 2000.

In 2001 and 2002 worked on position visiting researcher of laboratory of seismic hazard of North California (head prof. W. Mooney).

In 2004 invited to work at University of Oklahoma by prof. E.M. Chesnokov for study of oil and gas layer stresses in hydro-break zone.