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MODELING STRESS-STRAIN STATE IN THE EPICENTRAL ZONE OF THE EARTHQUAKE 26.01.2001, M=6.9 (INDIA)
Geophysical Center, Russian Academy of Sciences, Moscow, Russia
Journal: Geophysical research
Tome: 17
Number: 4
Year: 2016
Pages: 23-36
UDK: 550.34.06; 550.34.01
DOI: 10.21455/gr2016.4-2
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Morozov V.N., Manevich A.I. MODELING STRESS-STRAIN STATE IN THE EPICENTRAL ZONE OF THE EARTHQUAKE 26.01.2001, M=6.9 (INDIA) // . 2016. Т. 17. № 4. С. 23-36. DOI: 10.21455/gr2016.4-2
@article{MorozovMODELING2016,
author = "Morozov, V. N. and Manevich, A. I.",
title = "MODELING STRESS-STRAIN STATE IN THE EPICENTRAL ZONE OF THE EARTHQUAKE 26.01.2001, M=6.9 (INDIA)",
journal = "Geophysical research",
year = 2016,
volume = "17",
number = "4",
pages = "23-36",
doi = "10.21455/gr2016.4-2",
language = "English"
}
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Keywords: modeling, stress-strain state, strong tectonic earthquakes, earthquake, aftershocks, forecast of earthquakes
Аnnotation: The genetic linkage of strong earthquakes with fault tectonics in continental regions gives grounds to assume that the high intensity gradient fields of tectonic stresses in local areas lead to tectonic ruptures (earthquakes) and following aftershock activity including co-seismic effects. We present the results of modeling of stress-strain state (SSS) in the epicentral zone before and after the strong tectonic earthquake 26.01.2001, M=6.9 in the north-western India. For this purpose, we used the author’s software package of SSS calculation for heterogeneous blocks disturbed by a system of tectonic faults (elastic formulation of the problem). The calculations were based on the experimental geological, geophysical, and seismological data available for this region.
It is shown that areas of high stresses that were formed before the earthquake determine the epicenter position and location of strong aftershocks with M≥5, whereas the stress drop areas correspond to location of weaker aftershocks. The majority of aftershocks are concentrated in the region of static stress drops exceeding 5 MPa. Assuming the thickness of seismogenic layer equal to 25 km, the energy released is ~2*20^17 J, which exceeds the energy of seismic waves radiated in the rupture process of the 2001 earthquake by two orders.
The results of modeling indicate that the epicentral zone of the possible future strong earthquake corresponding to high stress area moves to the south. The results obtained can contribute to the possibility of forecasting the locations of strong earthquakes in seismically active regions based on SSS modeling of heterogeneous blocks disturbed by tectonic faults.
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Rogozhin Ye.A. Tectonics of strong earthquakes of Northern Eurasia XX century, Rossiyskiy zhurnal nauk o Zemle (Russian Journal of Earth Sciences), Moscow, 2000, vol. 2, no. 1, pp. 37 – 62, (in Russ.).
Shebalin N.V. Sil'nyye zemletryaseniya (Strong earthquakes). Izbrannyye trudy. Moscow: Izdvo Akademii gornykh nauk, 1997.
Sherman S. I. and other, Razlomoobrazovaniye v litosfere: zony sdviga (Faulting in the lithosphere: shear zones), Novosibirsk: Nauka, 1992, (in Russ.).
Sinvhal A., Bose P. R., Prakash V., Bose A., Sara A. K., and Sinvha H. l. Isoseismals for the Kutch earthquake of 26th January 2001, Journal of Earth System Science, 2003, vol.112, Issue 3, pp. 375 - 383.
Shikha Rajput, V.K. Gahalaut and Vipul K. Sahu Coulomb stress changes and aftershocks of recent Indian earthquakes, Current science, 2005, no. 88, pp. 576 – 588.
Yanovskya T.B. and Servatovich A.S., Features of seismicity before the earthquake, Voprosy geofiziki (Questions geophysics), 2011, no. 44, pp. 27 – 33, (in Russ.).
Benioff H., Mechanism and characteristics of strains White Wolf gap detected in the study of the sequence of aftershocks, Slabyye zemletryaseniya (Weak earthquakes), Moscow: 1961, pp. 211 – 219, (in Russ.).
Kayal J.R. and Mukhopadhyay S., Seismotectonics of the 2001 Bhuj earthquake (Mw 7.7) in western India: Constraints from aftershocks, Geophys. J. Int., 2006, vol.10, no. 1, pp. 45 - 57.
Kochoryan G.G. The scale effect in seismotectonics, Geodinamika i tektonofizika (Geodynamics and Tectonophysics). Irkutsk: 2014, no. 5, pp. 353 – 385, (in Russ.).
Kolesnikov I. Yu., Morozov V. N., and Tatarinov V. N. Certificate of state registration No2011614290 Program to calculate the stress-strain state in the rock mass on the basis of heterogeneous finite element modeling «GEODYN 1.0», 2011.
Mian Liu, Zhengkang Shen, Shimin Wang, Min Wang, and Yongge Wan. Active tectonics and intracontinental earthquakes in China: The kinematics and geodynamics, The Geological Society of America, 2007, Special Paper 425, pp. 299 – 318.
Morozov V. N., Kolesnikov I. Yu., and Tatarinov V. N. Modeling the Hazard Levels of Stress-Strain State in Structural Blocks in Nizhnekanskii Granitoid Massif for Selecting Nuclear Waste Disposal Sites, Water Resources, 2012, vol. 39, no. 7, pp. 756 – 769.
Morozov V. N., Kolesnikov I. Yu.., Belov S.V., and Tatarinov V.N. Stress-strain state Nizhnekansky massif - the area of possible disposal of radioactive waste), Geoekologiya (Geoecology), Moscow, 2008, no. 3, pp. 232 – 243, (in Russ.).
Morozov V. N., Kolesnikov I. Yu., and Tatarinov V. N. Modeling of hazard levels of the stress-strain state in structural units Nizhnekansky granitoid massif (to the choice of radioactive waste disposal sites, Geoekologiya (Geoecology), Moscow, 2011, no. 6, pp. 524 – 542 (in Russ.).
Narsaiah Rapolu and Prantik Mandal. Source parameters of the 2001 Mw 7.7 Bhuj earthquake, Gujarat, India, aftershock sequence, Journal of the Geological Society of India, 2014, vol.83, Issue 5, pp. 517 - 531.
Narula P.I. and Chaubey S.K. Macroseismic surveys for the Bhui (India) earthquake, 2004.
Osokina D.N., Yakovlev F.L., and Voytenko V.I., Study of tectonic fracture influence as an object that combines magatreschinu her field (stresses, strains), and secondary structures
(tectonophysical analysis), Problemy tektonofiziki (Problems tectonophysics). Moscow: 2008, pp. 89 – 102 (in Russ.).
Reddy C. D. and Sunil P. S.., Post-seismic crustal deformation and strain rate in Bhuj region, western India, after the 2001 January 26 earthquake, Geophys. J. Int., 2008, vol.172, Issue 2, pp. 593 – 606, 2008. DOI: 10.1111/j.1365-246X.2007.03641.x.
Rogozhin Ye.A. Tectonics of strong earthquakes of Northern Eurasia XX century, Rossiyskiy zhurnal nauk o Zemle (Russian Journal of Earth Sciences), Moscow, 2000, vol. 2, no. 1, pp. 37 – 62, (in Russ.).
Shebalin N.V. Sil'nyye zemletryaseniya (Strong earthquakes). Izbrannyye trudy. Moscow: Izdvo Akademii gornykh nauk, 1997.
Sherman S. I. and other, Razlomoobrazovaniye v litosfere: zony sdviga (Faulting in the lithosphere: shear zones), Novosibirsk: Nauka, 1992, (in Russ.).
Sinvhal A., Bose P. R., Prakash V., Bose A., Sara A. K., and Sinvha H. l. Isoseismals for the Kutch earthquake of 26th January 2001, Journal of Earth System Science, 2003, vol.112, Issue 3, pp. 375 - 383.
Shikha Rajput, V.K. Gahalaut and Vipul K. Sahu Coulomb stress changes and aftershocks of recent Indian earthquakes, Current science, 2005, no. 88, pp. 576 – 588.
Yanovskya T.B. and Servatovich A.S., Features of seismicity before the earthquake, Voprosy geofiziki (Questions geophysics), 2011, no. 44, pp. 27 – 33, (in Russ.).
