The stressed state of the Earth’s crust in the Altai-Sayan mountain region: reconstruction based on the modified algorithms of the cataclastic method
The article presents the results of a new reconstruction of stress in the Earth’s crust in the Altai-Sayan mountain region and their adjacent territories based on seismological data, and using a new modification of the method of cataclastic analysis (MCA) of fault displacements by Yu.L. Rebetsky. T...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Дальневосточного отделения Российской академии наук, Южно-Сахалинск, Федеральное государственное бюджетное учреждение науки Институт морской геологии и геофизики
2024-12-01
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| Series: | Геосистемы переходных зон |
| Subjects: | |
| Online Access: | http://journal.imgg.ru/web/full/f2024-4-1.pdf |
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| Summary: | The article presents the results of a new reconstruction of stress in the Earth’s crust in the Altai-Sayan mountain region and their adjacent territories based on seismological data, and using a new modification
of the method of cataclastic analysis (MCA) of fault displacements by Yu.L. Rebetsky. The reconstruction is
based on the catalog of earthquake focal mechanisms collected from various sources and comprising 584
events. In earlier works by Yu.L. Rebetsky et al. (2012, 2013), the data on focal mechanisms of 308 events
obtained in the studies of N.D. Zhalkovsky et al. (1995) were used for studying the Altai-Sayan mountain region.
This paper discusses the modified algorithms implemented in the latest version of the STRESSseism program,
on the basis of which the stress reconstruction was performed. The extended data on focal mechanisms
provided the stress inversion with a smaller averaging scale and allowed obtaining data for a larger number of
time intervals of the quasi-homogeneous stress state in each node. Distribution maps of the directions of the
maximum compression axis and the geodynamic type of the stress state, as well as the value of the Lode –
Nadai coefficient were constructed and compared with the results of the previously performed reconstruction.
Based on the modification of the MCA algorithm, stable orientations of the axes of the principal stresses were
obtained. The results of the stress reconstruction can be used for tectonophysical zoning of dangerous
segments of active faults. |
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| ISSN: | 2541-8912 2713-2161 |