Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes
Abstract We determined focal mechanism solutions of microearthquakes and examined the stress field in the low-seismicity region from southern Hokkaido to eastern Aomori, NE Japan. The stress fields determined in this study comprise (1) a reverse faulting stress regime in southern Hokkaido with the a...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-08-01
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| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40623-020-01245-8 |
| _version_ | 1818340629033254912 |
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| author | Sumire Maeda Toru Matsuzawa Tomomi Okada Hiroshi Katao Takeyoshi Yoshida Masahiro Kosuga Makoto Otsubo |
| author_facet | Sumire Maeda Toru Matsuzawa Tomomi Okada Hiroshi Katao Takeyoshi Yoshida Masahiro Kosuga Makoto Otsubo |
| author_sort | Sumire Maeda |
| collection | DOAJ |
| description | Abstract We determined focal mechanism solutions of microearthquakes and examined the stress field in the low-seismicity region from southern Hokkaido to eastern Aomori, NE Japan. The stress fields determined in this study comprise (1) a reverse faulting stress regime in southern Hokkaido with the axis of maximum compressional stress (σ 1) being sub-horizontal and trending WNW–ESE, and (2) a stress regime in eastern Aomori to Tsugaru Strait that shows temporal variations and differential stress of less than tens of MPa. The spatiotemporal variation in stress from eastern Aomori to Tsugaru Strait might reflect the effects of the upper-plate bending and the 2011 M w 9.0 Tohoku-Oki earthquake. It also indicates that the compressional stress caused by the descending Pacific plate is relatively weak, which is similar to other areas in eastern parts of the NE Japan arc. |
| first_indexed | 2024-12-13T15:45:56Z |
| format | Article |
| id | doaj.art-538f8a77ad8b4e93a674d0d159fd031c |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-13T15:45:56Z |
| publishDate | 2020-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-538f8a77ad8b4e93a674d0d159fd031c2022-12-21T23:39:41ZengSpringerOpenEarth, Planets and Space1880-59812020-08-017211710.1186/s40623-020-01245-8Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakesSumire Maeda0Toru Matsuzawa1Tomomi Okada2Hiroshi Katao3Takeyoshi Yoshida4Masahiro Kosuga5Makoto Otsubo6Geological Survey of Japan, AIST Tsukuba Central, National Institute of Advanced Industrial Science and TechnologyGraduate School of Science, Tohoku UniversityGraduate School of Science, Tohoku UniversityResearch Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto UniversityGraduate School of Science, Tohoku UniversityGraduate School of Science and Technology, Hirosaki UniversityGeological Survey of Japan, AIST Tsukuba Central, National Institute of Advanced Industrial Science and TechnologyAbstract We determined focal mechanism solutions of microearthquakes and examined the stress field in the low-seismicity region from southern Hokkaido to eastern Aomori, NE Japan. The stress fields determined in this study comprise (1) a reverse faulting stress regime in southern Hokkaido with the axis of maximum compressional stress (σ 1) being sub-horizontal and trending WNW–ESE, and (2) a stress regime in eastern Aomori to Tsugaru Strait that shows temporal variations and differential stress of less than tens of MPa. The spatiotemporal variation in stress from eastern Aomori to Tsugaru Strait might reflect the effects of the upper-plate bending and the 2011 M w 9.0 Tohoku-Oki earthquake. It also indicates that the compressional stress caused by the descending Pacific plate is relatively weak, which is similar to other areas in eastern parts of the NE Japan arc.http://link.springer.com/article/10.1186/s40623-020-01245-8Focal mechanismStress fieldLow-seismicity areaMicroseismicityForearcNortheastern Japan |
| spellingShingle | Sumire Maeda Toru Matsuzawa Tomomi Okada Hiroshi Katao Takeyoshi Yoshida Masahiro Kosuga Makoto Otsubo Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes Earth, Planets and Space Focal mechanism Stress field Low-seismicity area Microseismicity Forearc Northeastern Japan |
| title | Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes |
| title_full | Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes |
| title_fullStr | Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes |
| title_full_unstemmed | Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes |
| title_short | Spatiotemporal variations in the stress field in the northeasternmost part of the NE Japan arc: constraints from microearthquakes |
| title_sort | spatiotemporal variations in the stress field in the northeasternmost part of the ne japan arc constraints from microearthquakes |
| topic | Focal mechanism Stress field Low-seismicity area Microseismicity Forearc Northeastern Japan |
| url | http://link.springer.com/article/10.1186/s40623-020-01245-8 |
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