IJG  Vol.2 No.1 , February 2011
Up-To-Date Geodynamics and Seismicity of Central Asia
ABSTRACT
The analysis of the seismicity in central Asia shows its distribution within a “triangle” of maximal inner-continental seismic activity, which is situated between south edge of the Lake Baikal and the Himalayas. The “triangle” coincides with the central Asian transit zone which divides the north Eurasian and Indian lithosphere plates and provides transfer and relaxation of tectonic stresses that arise between them. The central Asian transit zone consists of numerous crust blocks of different sizes. Blocks’ boundaries are often represented by not only single faults but relatively wide interblock zones characterized by intensive shattering of rocks and releasing a significant quantity of the seismic energy. The most active interblock zones limited the Pamirs, Tien Shan, Shan, and Bayanhar blocks as well as north boundaries of the Indian Plate. The quantity of the seismic energy releasing along each of them reaches ≥ 5?1015 J, while along other boundaries it doesn’t exceed 3?1012-2?1015 J. The majority of the most intensive seismic events took place just in these interblock zones. The total quantity of seismic energy is generally diminished away from the boundary of the Indian Plate, but sometimes the maximal quantity releases in inner parts of the transit zone at the distance 500-1500 km from the plate boundary. The most active interblock zones of central Asia differ from subduction and collision zones by depth of their penetration in lithosphere and at the same time are rather near to them by the volume of energy realizing. The examination of interblock zones shows that the majority of intensives earthquakes occur within them in regions with sharp changes of geodynamic conditions. On the whole the most part of central Asia is situated under the influence of the Indian indenter, which causes the prevailing of transpression tectonics. An abnormal high seismic energy releasing depends of deep continuation of the plate slab in collision zones (Pamirs, Himalayas), intensive displacements along strike-slips and thrusts due to collision processes and deep lithosphere unhomogeneity (Tien Shan, Bayanhar), as well as of sharp changes of geodynamic conditions because of influence of plate movement and supposed mantle plumes (north Mongolia, the Baikal region).

Cite this paper
nullY. Gatinsky, D. Rundquist, G. Vladova and T. Prokhorova, "Up-To-Date Geodynamics and Seismicity of Central Asia," International Journal of Geosciences, Vol. 2 No. 1, 2011, pp. 1-12. doi: 10.4236/ijg.2011.21001.
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[51]   D. A. Wiens, C. DeMets, R. G. Gordon et al., “A diffuse Plate Boundary Model for Indian Ocean Tectonics,” Geophysics Research Letters, Vol. 12, No. 7, 1985, pp. 429-432. doi:10.1029/GL012i007p00429

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[59]   H. Kao, G. Rui, R.-J. Rau et al., ” Seismic Image of the Tarim Basin and Its Collision with Tibet,” Geology, Vol. 29, No. 7, 2001, pp. 575-578. doi:10.1130/0091-7613(2001)029<0575:SIOTTB>2.0.CO;2

[60]   S.-L. Chung, M.-F. Chu, Y. Zhang et al., ”Tibetian Tectonic Evolution Inffered from Spatial and Temporal Variations in Post-Collisional Magmatism,” Earth Scientific Review, Vol. 68, No. 3-4, 2005, pp. 173-196. doi:10.1016/j.earscirev.2004.05.001

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[63]   L. Xiao, C. Wang and F. Pirajno, “Is the Underthrust Indian Lithosphere Split Beneath the Tibetan Plateau?” International Geology Review, Vol. 49, No. 1, 2007, pp. 90-98. doi:10.2747/0020-6814.49.1.90

[64]   D. V. Rundquist, Yu. G. Gatinsky and S. V. Cherkasov, “The Natural Trans-Eurasian Divider: Structural and Metallogenic Evidences,” Abstracts 32-IGC, part 2, Florence, Aug. 2004, p. 620.

[65]   V. A. Sankov, A. I. Lukhnev, V. I. Melnikova et al., “Present-day Tectonic Deformations of the Southern Mounting Frame of the Siberian Platform from GPS Geodesy Data,” Proceedings International Seminar On the use of space techniques for Asia-Pacific regional crustal movements studies, Irkutsk, August 2002, Moscow, GEOS, 2003, pp. 118-126.

[66]   Yu. G. Gatinsky, T. V. Prokhorova, D. V. Rundquist and G.L.Vladova, “Zones of Catastrophic Earthquakes of Central Asia: Geodynamics and Seismic Energy,” 2009. http://dx.doi.org/10.2205/2009ES000326

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[71]   S. Li, M. J. Unsworth, J. R. Booker et al., “Partial Melt Or Aqueous Fluid in the Mid-Crust of Southern Tibet? Constraints from INDEPTH magnetotelluric data,” Geophysical Journal International, Vol. 153, No. 2, 2003, pp. 289-304. doi:10.1046/j.1365-246X.2003.01850.x

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[73]   Yu. G. Gatinsky and G. L. Vladova, “Subduction Zones of SE Asia: Main Types, Seismicity and Mineralization,” Proceedings VAG International Symposium, Hanoi, November 2008, pp. 9-16.

[74]   J. Liu-Zeng, Z. Zhang, L. Wen et al., “Co-Seismic Ruptures of the 12 May 2008, Ms 8.0 Wenchuan Earthquake, Sichuan: East–West Crustal Shortening on Oblique, Parallel Thrusts Along the Eastern Edge of Tibet,” Earth and Planetary Science Letters, Vol. 286, No. 3-4, 2009, pp. 355-370. doi:10.1016/j.epsl.2009.07.017

[75]   Yu. G. Gatinsky, D. V. Rundquist, G. L. Vladova and T.V. Prokhorova, “Geodynamics of the Sichuan Earthquake Region in May 12, 2008,” Doklady Earth Sciences, Vol. 423A, No. 9, 2008, pp.1507-1509. doi:10.1134/S1028334X08090419

[76]   X. Yuan, A.S. Egorov, GEMOC, “A Short Introduction to Global Geoscience Transect 21: Arctic Ocean–Eurasia– Pacific Ocean,” Science Press, 2000.

[77]   Chen Ji, “Finite Fault Models for M7.9 Earthquake,” 2008. http://earthquake.usgs.gov/eqcenter/page

[78]   A. I. Miroshnichenko, V. A. Sankov, A. V. Parfeevets and A. V. Lukhnev, “State of Stress and Strain of the Earth Crust of the Basins of North Mongolia from the Model Results,” Proceedings Conference commemorating the 50th anniversary of the 1957 Gobi-Altay earthquake, Ulaanbaatar–Irkutsk, August. 2007, pp. 138-143.

[79]   A. F. Grachev, “Modern Volcanism, Mantle Plumes, and Their Connection with the Stress Intensity in the Lithosphere”, In: A. F. Grachev, Ed., Neotectonics, Geody- namics and Seismicity of Northern Eurasia, Probel, Moscow, 2000, pp. 245-266 (In Russian).

[80]   H. Kanamori and D. L. Anderson, “Theoretical Basis of Some Empirical Relations in Seismology,” Bulletin of the Seismological Society of America, Vol. 65, No. 5, October 1975, pp. 1073-109.

 
 
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