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GiS-based analysis of fault patterns in urban areas： A case study of irkutsk city, Russia

Geoscience Frontiers 2016年第2期7卷 287-294页

作者： R.M. Lobatskaya i.p. strelchenko irkutsk Research Technological University Irkutsk Russia

The capabilities of GiS in modeling fault patterns are explored for irkutsk city in East Siberia with i.p.ications for ground stability. The neotectonic structure of the area is visualized in three dimension （3D） taking into account fault dips, using the ArcGiS, GlobalMapper and paradigm Geophysical packages. The study area is divided into blocks of different size classes according to the length-based ranks of the bounding faults, which are of five classes distinguished with the equal interval method. The blocks show different deformation patterns, with different densities and strikes of crossing and bounding faults. The data are statistically processed using GiS to estimate the deformation degrees of blocks in arbitrary units per square kilometer using the attributes of rank and crossing/bounding position of faults and the size of blocks. The deformation degrees are then compared with available estimates of ground stability measured as a score of points corresponding to destabilizing factors. Although the comparison generally confirms some linkage between the deformation degree of blocks and their ground stability, the correlation is intricate and ambiguous. in order to enhance the advantages of GiS in building and analyzing 3D models of fault patterns for estimating ground stability and mitigating geological hazards, it is expected in the future to proceed from the reported initial step of visualization to more advanced analysis.

关键词： GiS 3D modeling Fault pattern Faults Blocks Ground stability

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维普期刊数据库

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Finite-element 3D modeling of stress patterns around a di.p.ng fault

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Geoscience Frontiers 2018年第5期9卷 1555-1563页

作者： R.M.Lobatskaya i.p.strelchenko E.S.Dolgikh irkutsk National Research Technical University 83Lermontov Str.664074 IrkutskRussia institute of Tibetan plateau Research Chinese Academy of Sciences16Lincui RoadChaoyang DistrictBeijing 100101China

Stresses in a block around a di.p.ng fracture simulating a damage zone of a fault are reconstructed by finite-element modeling. A fracture corresponding to a fault of different lengths, with its plane di.p.ng at different angles, is assumed to follow a lithological interface and to experience either compression or shear. The stress associated with the destruction shows an asymmetrical pattern with different distances from the highest stress sites to the fault plane in the hanging and foot walls. As the dip angle decreases,the high-stress zone becomes wider in the hanging wall but its width changes negligibly in the foot *** length of the simulated fault and the deformation type affect only the magnitude of maximum stress,which remains asymmetrical relative to the fault plane. The Lh/Lfratio, where Lhand Lfare the widths of high-stress zones in the hanging and foot walls of the fault, respectively, is inversely proportional to the fault plane dip. The arithmetic mean of this ratio over different fault lengths in fractures subject to compression changes from 0.29 at a dip of 80°to 1.67 at 30°. in the case of shift di.p.acement, ratios are increasing to 1.2 and 2.94, *** they consider vertical fault planes and symmetry in a damage zone of faults. Following that assumption may cause errors in reconstructions of stress and fault patterns in areas of complex structural setting. According geological data, we know the structures are different and asymmetric in hanging and foot walls of fault. Thus, it is i.p.rtant to quantify zones of that asymmetry. The modeling results have to be taken into account in studies of natural faults, especially for practical applications in seismic risk mapping, engineering geology, hydrogeology, and tectonics.

关键词： Stress Fault Finite-element modeling ANSYS package

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维普期刊数据库

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poisson's Ratio of Northern Margin of Tibetan plateau and its Geodynamic i.p.ication

Poisson's Ratio of Northern Margin of Tibetan Plateau and It...

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2019年中国地球科学联合学术年会

作者： Junmeng Zhao Zhijun Jin irina strelchenko Xiankang Zhang CAS Center for Excellence in Tibetan plateau Earth Sciences institute of Tibetan plateau Research Chinese Academy of Sciences University of Chinese Academy of Sciences petroleum University China Geophysical Exploration Center China Seismological Bureau

1. introduction The Tibetan plateau has long occupied the enigmatic position of the earth science. The uplift mechanism of this young plateau has attracted much attention of geosciences, and there have been many research results on this problem. Several decades has past the researchers realized that the problem of the Tibetan plateau cannot be solved from itself only. Deep structures of basins and ranges north to the plateau have to be studied in great detail to determine geodynamic conditions of the northern boundary of the plateau uplift (Zhao et al., 2010).

关键词： poisson's Ratio of Northern Margin of Tibetan plateau and its Geodynamic i.p.ication Northern

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Deep Structure of Rifts Developed in South Tibet Revealed by Receiver Functions

Deep Structure of Rifts Developed in South Tibet Revealed by...

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2019年中国地球科学联合学术年会

作者： Junmeng Zhao Caibayangzeng Qaing Xu Hongbing Liu irina strelchenko CAS Center for Excellence in Tibetan plateau Earth Sciences institute of Tibetan plateau Research Chinese Academy of Sciences University of Chinese Academy of Sciences

*** A series of giant structures with south-north direction were developed in southern *** usually call them"the Southern Tibet Rift System".At present,the rift system has been studied,but its formation mechanism and ... 详细信息

关键词： Deep Structure of Rifts Developed in South Tibet Revealed by Receiver Functions

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Lithospheric Structure of Northern pakistan Revealed by passive Source Seismology

Lithospheric Structure of Northern Pakistan Revealed by Pass...

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2019年中国地球科学联合学术年会

作者： Junmeng Zhao Zahid imran Bhatti Qiang Xu irina strelchenko CAS Center for Excellence in Tibetan plateau Earth Sciences institute of Tibetan plateau Research Chinese Academy of Sciences University of Chinese Academy of Sciences

1. introduction The india-Asia collision and subsequent subduction initiated the evolution of major tectonic features in the Western Syntaxis. The complex tectonic structure and shallow to deep seismicity in pamir-Hin... 详细信息

关键词： Lithospheric Structure of Northern pakistan Revealed by passive Source Seismology Northern

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