STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT
Using the analytical approximation method, we calculated stress field parameters for cases with different relative positions of Riedel shears and loads required for shearing. Considering an internal friction angle of 30°, and the distance between adjacent shears exceeding 0.7 of the characteristic s...
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| Format: | Article |
| Language: | English |
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2021-09-01
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| Series: | Геодинамика и тектонофизика |
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| Online Access: | https://www.gt-crust.ru/jour/article/view/1237 |
| _version_ | 1826557513904947200 |
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| author | A. S. Lermontova |
| author_facet | A. S. Lermontova |
| author_sort | A. S. Lermontova |
| collection | DOAJ |
| description | Using the analytical approximation method, we calculated stress field parameters for cases with different relative positions of Riedel shears and loads required for shearing. Considering an internal friction angle of 30°, and the distance between adjacent shears exceeding 0.7 of the characteristic shear length, we estimated the Coulomb stress that can lead to fracturing. In the areas between the shears, it is below the shear strength value. This means that if an increase in the external load is lacking, there are no prerequisites for the formation of new fractures that may connect adjacent shears. If the shears are spaced closer to each other (i.e. at distances less than 0.7 of the shear length), the shear strength is exceeded in the areas between them, and new shears can occur there and connect the Riedel shears to each other. Therefore, in observations of a natural system of Riedel shears, it becomes possible to assess whether this system is sufficiently stable in its current status, or, in case of a critical increase in the Coulomb stress in the areas between adjacent shears, the equilibrium can be easily disturbed, and there is a possibility that the main fault forms in the strike-slip zone under study. |
| first_indexed | 2024-04-09T20:27:30Z |
| format | Article |
| id | doaj.art-4371ef07fdfd42e29c4f5acc1bf08a75 |
| institution | Directory Open Access Journal |
| issn | 2078-502X |
| language | English |
| last_indexed | 2025-03-14T08:29:48Z |
| publishDate | 2021-09-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj.art-4371ef07fdfd42e29c4f5acc1bf08a752025-03-02T13:02:50ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2021-09-0112349950710.5800/GT-2021-12-3-0536537STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULTA. S. Lermontova0Schmidt Institute of Physics of the Earth, Russian Academy of SciencesUsing the analytical approximation method, we calculated stress field parameters for cases with different relative positions of Riedel shears and loads required for shearing. Considering an internal friction angle of 30°, and the distance between adjacent shears exceeding 0.7 of the characteristic shear length, we estimated the Coulomb stress that can lead to fracturing. In the areas between the shears, it is below the shear strength value. This means that if an increase in the external load is lacking, there are no prerequisites for the formation of new fractures that may connect adjacent shears. If the shears are spaced closer to each other (i.e. at distances less than 0.7 of the shear length), the shear strength is exceeded in the areas between them, and new shears can occur there and connect the Riedel shears to each other. Therefore, in observations of a natural system of Riedel shears, it becomes possible to assess whether this system is sufficiently stable in its current status, or, in case of a critical increase in the Coulomb stress in the areas between adjacent shears, the equilibrium can be easily disturbed, and there is a possibility that the main fault forms in the strike-slip zone under study.https://www.gt-crust.ru/jour/article/view/1237coulomb stressshear strengthsecond-order structuressystem of subparallel shearsshear zonesecondary dislocations |
| spellingShingle | A. S. Lermontova STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT Геодинамика и тектонофизика coulomb stress shear strength second-order structures system of subparallel shears shear zone secondary dislocations |
| title | STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT |
| title_full | STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT |
| title_fullStr | STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT |
| title_full_unstemmed | STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT |
| title_short | STRESS FIELD IN A SHEAR ZONE, AND FORMATION OF THE MAIN FAULT |
| title_sort | stress field in a shear zone and formation of the main fault |
| topic | coulomb stress shear strength second-order structures system of subparallel shears shear zone secondary dislocations |
| url | https://www.gt-crust.ru/jour/article/view/1237 |
| work_keys_str_mv | AT aslermontova stressfieldinashearzoneandformationofthemainfault |