TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE
The study has been done on the orientation of the principal axes of tectonic stress field at intermediate depths of earthquakes of the southern flank of the Kuril-Kamchatka subduction system separately for the upper and lower double seismic focal zones. Use has been made of the NIED and GlobalCMT ca...
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2021
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ftdoajarticles:oai:doaj.org/article:7385fd574d77487dad868590649cadcc 2023-05-15T16:59:03+02:00 TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE D. A. Safonov 2021-12-01T00:00:00Z https://doi.org/10.5800/GT-2021-12-4-0564 https://doaj.org/article/7385fd574d77487dad868590649cadcc EN RU eng rus Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust https://www.gt-crust.ru/jour/article/view/1374 https://doaj.org/toc/2078-502X 2078-502X doi:10.5800/GT-2021-12-4-0564 https://doaj.org/article/7385fd574d77487dad868590649cadcc Геодинамика и тектонофизика, Vol 12, Iss 4, Pp 929-950 (2021) kuril-okhotsk region double seismic focal zone tectonic stress field slab intermediate depth Science Q article 2021 ftdoajarticles https://doi.org/10.5800/GT-2021-12-4-0564 2022-12-30T19:45:43Z The study has been done on the orientation of the principal axes of tectonic stress field at intermediate depths of earthquakes of the southern flank of the Kuril-Kamchatka subduction system separately for the upper and lower double seismic focal zones. Use has been made of the NIED and GlobalCMT catalogue data. The computation-based results are presented on schemes of the stressed state of the investigated areas and in tables. In the context of the southern Kuril Islands, evidence has been provided for predominance of the maximum compressive stresses along the slab plane in the upper layer and minimal compressive stresses (deviation extension) in the lower layer. However, the principal axes of maximum and minimum compression are displaced in direction relative to the slab dip: by 30–40° counterclockwise for the compression axis in the upper layer, which coincides with the direction of plate movement, and clockwise for the extension axis in the lower layer. This might be caused by the right-lateral strike-slip component of the Pacific Plate subduction. Unlike the general trend, the orientation of the principal axes of the stress field beneath the central Hokkaido-related segments in the upper layer is almost identical to that in the lower layer. There have also been found the segments exposed to shear stress, with the most extensive located opposite the northern Kunashir Island and beneath the southern Hokkaido Island. The results obtained for major large groups of clusters show good accordance with those published by other authors. The discrepancies relate primarily to small groups of isolated clusters showing local stress field heterogeneities. Article in Journal/Newspaper Kamchatka Directory of Open Access Journals: DOAJ Articles Okhotsk Pacific Geodynamics & Tectonophysics 12 4 929 950 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Russian |
topic |
kuril-okhotsk region double seismic focal zone tectonic stress field slab intermediate depth Science Q |
spellingShingle |
kuril-okhotsk region double seismic focal zone tectonic stress field slab intermediate depth Science Q D. A. Safonov TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE |
topic_facet |
kuril-okhotsk region double seismic focal zone tectonic stress field slab intermediate depth Science Q |
description |
The study has been done on the orientation of the principal axes of tectonic stress field at intermediate depths of earthquakes of the southern flank of the Kuril-Kamchatka subduction system separately for the upper and lower double seismic focal zones. Use has been made of the NIED and GlobalCMT catalogue data. The computation-based results are presented on schemes of the stressed state of the investigated areas and in tables. In the context of the southern Kuril Islands, evidence has been provided for predominance of the maximum compressive stresses along the slab plane in the upper layer and minimal compressive stresses (deviation extension) in the lower layer. However, the principal axes of maximum and minimum compression are displaced in direction relative to the slab dip: by 30–40° counterclockwise for the compression axis in the upper layer, which coincides with the direction of plate movement, and clockwise for the extension axis in the lower layer. This might be caused by the right-lateral strike-slip component of the Pacific Plate subduction. Unlike the general trend, the orientation of the principal axes of the stress field beneath the central Hokkaido-related segments in the upper layer is almost identical to that in the lower layer. There have also been found the segments exposed to shear stress, with the most extensive located opposite the northern Kunashir Island and beneath the southern Hokkaido Island. The results obtained for major large groups of clusters show good accordance with those published by other authors. The discrepancies relate primarily to small groups of isolated clusters showing local stress field heterogeneities. |
format |
Article in Journal/Newspaper |
author |
D. A. Safonov |
author_facet |
D. A. Safonov |
author_sort |
D. A. Safonov |
title |
TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE |
title_short |
TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE |
title_full |
TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE |
title_fullStr |
TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE |
title_full_unstemmed |
TECTONIC STRESS FIELD AT INTERMEDIATE DEPTHS OF THE SOUTHERN FLANK OF THE KURIL-KAMCHATKA SEISMIC ZONE |
title_sort |
tectonic stress field at intermediate depths of the southern flank of the kuril-kamchatka seismic zone |
publisher |
Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
publishDate |
2021 |
url |
https://doi.org/10.5800/GT-2021-12-4-0564 https://doaj.org/article/7385fd574d77487dad868590649cadcc |
geographic |
Okhotsk Pacific |
geographic_facet |
Okhotsk Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Геодинамика и тектонофизика, Vol 12, Iss 4, Pp 929-950 (2021) |
op_relation |
https://www.gt-crust.ru/jour/article/view/1374 https://doaj.org/toc/2078-502X 2078-502X doi:10.5800/GT-2021-12-4-0564 https://doaj.org/article/7385fd574d77487dad868590649cadcc |
op_doi |
https://doi.org/10.5800/GT-2021-12-4-0564 |
container_title |
Geodynamics & Tectonophysics |
container_volume |
12 |
container_issue |
4 |
container_start_page |
929 |
op_container_end_page |
950 |
_version_ |
1766051226327187456 |