Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD
Abstract In the southwestern area of the Kurile Islands subduction zone, three large earthquakes including the M w8.2 1969 and the M w8.3 1994 Hokkaido Toho-oki earthquakes and the M w7.8 1975 tsunami earthquake occurred in almost the same location. The three main shocks and their aftershocks were r...
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| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
SpringerOpen
2024-09-01
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| coleção: | Earth, Planets and Space |
| Assuntos: | |
| Acesso em linha: | https://doi.org/10.1186/s40623-024-02069-6 |
| _version_ | 1827098855461617664 |
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| author | Kei Katsumata |
| author_facet | Kei Katsumata |
| author_sort | Kei Katsumata |
| collection | DOAJ |
| description | Abstract In the southwestern area of the Kurile Islands subduction zone, three large earthquakes including the M w8.2 1969 and the M w8.3 1994 Hokkaido Toho-oki earthquakes and the M w7.8 1975 tsunami earthquake occurred in almost the same location. The three main shocks and their aftershocks were re-determined simultaneously using a double-difference earthquake location method, HypoDD. As a result, the 1969 and the 1975 main shocks and their aftershocks were concentrated near the upper surface of the subducting Pacific plate, indicating that both events were plate boundary megathrust earthquakes as shown by previous studies. On the other hand, the 1994 main shock and its aftershocks were distributed within the Pacific plate indicating that the 1994 event was an intraslab event as reported by previous studies. The result that interplate earthquakes and intraslab earthquakes could be appropriately distinguished is strong evidence that the accuracy of hypocenter determination is sufficiently high. The centroid moment tensor solution of the 1994 main shock has two nodal planes which are parallel or normal to the Kurile Trench. According to the high-resolution hypocenter distribution obtained in the present study, the aftershocks appear to locate on the nodal plane normal to the trench, suggesting that the source fault ruptured by the 1994 main shock was not parallel but normal to the Kurile Trench. Moreover, we found that the Coulomb failure stress change (ΔCFS) produced by the trench-normal fault plane is more likely to trigger the largest aftershock than ΔCFS produced by the trench-parallel fault plane. Graphical abstract |
| first_indexed | 2025-03-20T07:54:11Z |
| format | Article |
| id | doaj.art-df0a2a7140e34f26b2d5f2c2e2b83fb5 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2025-03-20T07:54:11Z |
| publishDate | 2024-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-df0a2a7140e34f26b2d5f2c2e2b83fb52024-09-29T11:15:38ZengSpringerOpenEarth, Planets and Space1880-59812024-09-0176111010.1186/s40623-024-02069-6Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDDKei Katsumata0Institute of Seismology and Volcanology, Faculty of Science, Hokkaido UniversityAbstract In the southwestern area of the Kurile Islands subduction zone, three large earthquakes including the M w8.2 1969 and the M w8.3 1994 Hokkaido Toho-oki earthquakes and the M w7.8 1975 tsunami earthquake occurred in almost the same location. The three main shocks and their aftershocks were re-determined simultaneously using a double-difference earthquake location method, HypoDD. As a result, the 1969 and the 1975 main shocks and their aftershocks were concentrated near the upper surface of the subducting Pacific plate, indicating that both events were plate boundary megathrust earthquakes as shown by previous studies. On the other hand, the 1994 main shock and its aftershocks were distributed within the Pacific plate indicating that the 1994 event was an intraslab event as reported by previous studies. The result that interplate earthquakes and intraslab earthquakes could be appropriately distinguished is strong evidence that the accuracy of hypocenter determination is sufficiently high. The centroid moment tensor solution of the 1994 main shock has two nodal planes which are parallel or normal to the Kurile Trench. According to the high-resolution hypocenter distribution obtained in the present study, the aftershocks appear to locate on the nodal plane normal to the trench, suggesting that the source fault ruptured by the 1994 main shock was not parallel but normal to the Kurile Trench. Moreover, we found that the Coulomb failure stress change (ΔCFS) produced by the trench-normal fault plane is more likely to trigger the largest aftershock than ΔCFS produced by the trench-parallel fault plane. Graphical abstracthttps://doi.org/10.1186/s40623-024-02069-6Aftershock distributionHypoDDKurile IslandsThe Hokkaido-Toho-oki earthquakesCoulomb failure stress change |
| spellingShingle | Kei Katsumata Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD Earth, Planets and Space Aftershock distribution HypoDD Kurile Islands The Hokkaido-Toho-oki earthquakes Coulomb failure stress change |
| title | Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD |
| title_full | Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD |
| title_fullStr | Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD |
| title_full_unstemmed | Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD |
| title_short | Not trench-parallel but trench-normal source fault of the 1994 Hokkaido Toho-oki earthquake as revealed by the aftershock relocation using HypoDD |
| title_sort | not trench parallel but trench normal source fault of the 1994 hokkaido toho oki earthquake as revealed by the aftershock relocation using hypodd |
| topic | Aftershock distribution HypoDD Kurile Islands The Hokkaido-Toho-oki earthquakes Coulomb failure stress change |
| url | https://doi.org/10.1186/s40623-024-02069-6 |
| work_keys_str_mv | AT keikatsumata nottrenchparallelbuttrenchnormalsourcefaultofthe1994hokkaidotohookiearthquakeasrevealedbytheaftershockrelocationusinghypodd |