Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan
Abstract Here we investigate the influence of the lithology and thermal state of the upper crust on earthquake distributions beneath the Wakayama region, southern Honshu, Japan, to better understand the influence of crustal conditions on regional seismogenesis. The earthquakes are concentrated in th...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-08-01
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| Series: | Earth, Planets and Space |
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| Online Access: | https://doi.org/10.1186/s40623-021-01503-3 |
| _version_ | 1818721765301420032 |
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| author | Sumire Maeda Shinji Toda Toru Matsuzawa Makoto Otsubo Takumi Matsumoto |
| author_facet | Sumire Maeda Shinji Toda Toru Matsuzawa Makoto Otsubo Takumi Matsumoto |
| author_sort | Sumire Maeda |
| collection | DOAJ |
| description | Abstract Here we investigate the influence of the lithology and thermal state of the upper crust on earthquake distributions beneath the Wakayama region, southern Honshu, Japan, to better understand the influence of crustal conditions on regional seismogenesis. The earthquakes are concentrated in the deeper sections of mafic belts and shallower sections of pelitic belts, based on a comparison of relocated hypocenters and estimated subsurface geological structures. We compare the frictional properties of pelitic rocks and basalt, as obtained from petrological experiments, with the hypocenter depth distributions in pelitic and mafic belts to assess the control of crustal lithology on the depth extent of regional seismicity. The earthquake distributions are consistent with the temperature ranges over which the respective rock types are expected to exhibit a velocity-weakening behavior, based on the petrological experiments. The results suggest that the occurrence of shallow intraplate earthquakes is controlled by the temperature- and lithology-dependent friction of the upper crust. |
| first_indexed | 2024-12-17T20:43:56Z |
| format | Article |
| id | doaj.art-b058f4be6dba41fe84ceed65338cb11b |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-17T20:43:56Z |
| publishDate | 2021-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-b058f4be6dba41fe84ceed65338cb11b2022-12-21T21:33:14ZengSpringerOpenEarth, Planets and Space1880-59812021-08-0173111010.1186/s40623-021-01503-3Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, JapanSumire Maeda0Shinji Toda1Toru Matsuzawa2Makoto Otsubo3Takumi Matsumoto4National Research Institute for Earth Science and Disaster ResilienceInternational Research Institute of Disaster Science, Tohoku UniversityGraduate School of Science, Tohoku UniversityGeological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 7National Research Institute for Earth Science and Disaster ResilienceAbstract Here we investigate the influence of the lithology and thermal state of the upper crust on earthquake distributions beneath the Wakayama region, southern Honshu, Japan, to better understand the influence of crustal conditions on regional seismogenesis. The earthquakes are concentrated in the deeper sections of mafic belts and shallower sections of pelitic belts, based on a comparison of relocated hypocenters and estimated subsurface geological structures. We compare the frictional properties of pelitic rocks and basalt, as obtained from petrological experiments, with the hypocenter depth distributions in pelitic and mafic belts to assess the control of crustal lithology on the depth extent of regional seismicity. The earthquake distributions are consistent with the temperature ranges over which the respective rock types are expected to exhibit a velocity-weakening behavior, based on the petrological experiments. The results suggest that the occurrence of shallow intraplate earthquakes is controlled by the temperature- and lithology-dependent friction of the upper crust.https://doi.org/10.1186/s40623-021-01503-3Lithological heterogeneitySeismicitySeismogenic depthLithospheric thermal structureGeological structureKii Peninsula |
| spellingShingle | Sumire Maeda Shinji Toda Toru Matsuzawa Makoto Otsubo Takumi Matsumoto Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan Earth, Planets and Space Lithological heterogeneity Seismicity Seismogenic depth Lithospheric thermal structure Geological structure Kii Peninsula |
| title | Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan |
| title_full | Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan |
| title_fullStr | Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan |
| title_full_unstemmed | Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan |
| title_short | Influence of crustal lithology and the thermal state on microseismicity in the Wakayama region, southern Honshu, Japan |
| title_sort | influence of crustal lithology and the thermal state on microseismicity in the wakayama region southern honshu japan |
| topic | Lithological heterogeneity Seismicity Seismogenic depth Lithospheric thermal structure Geological structure Kii Peninsula |
| url | https://doi.org/10.1186/s40623-021-01503-3 |
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