The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence
Several physical mechanisms of earthquake nucleation, such as pre-slip, cascade triggering, aseismic slip, and fluid-driven models, have been proposed. However, it is still not clear which model plays the most important role in driving foreshocks and mainshock nucleation for given cases. In this stu...
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KeAi Communications Co. Ltd.
2025-01-01
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| Series: | Earthquake Research Advances |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772467024000587 |
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| author | Zhigang Peng Xinglin Lei Qing-Yu Wang Dun Wang Phuc Mach Dongdong Yao Aitaro Kato Kazushige Obara Michel Campillo |
| author_facet | Zhigang Peng Xinglin Lei Qing-Yu Wang Dun Wang Phuc Mach Dongdong Yao Aitaro Kato Kazushige Obara Michel Campillo |
| author_sort | Zhigang Peng |
| collection | DOAJ |
| description | Several physical mechanisms of earthquake nucleation, such as pre-slip, cascade triggering, aseismic slip, and fluid-driven models, have been proposed. However, it is still not clear which model plays the most important role in driving foreshocks and mainshock nucleation for given cases. In this study, we focus on the relationship between an intensive earthquake swarm that started beneath the Noto Peninsula in Central Japan since November 2020 and the nucleation of the 2024 M 7.6 Noto Hanto earthquake. We relocate earthquakes listed in the standard Japan Meteorological Agency (JMA) catalog since 2018 with the double-different relocation method. Relocated seismicity revealed that the 2024 M 7.6 mainshock likely ruptured a thrust fault above a parallel fault where the M 6.5 Suzu earthquake occurred in May 2023. We find possible along-strike and along-dip expansion of seismicity in the first few months at the beginning of the swarm sequence, while no obvious migration pattern in the last few days before the M 7.6 mainshock was observed. Several smaller events occurred in between the M 5.5 and M 4.6 foreshocks that occurred about 4 min and 2 min before the M7.6 mainshock. The Coulomb stress changes from the M 5.5 foreshock were negative at the hypocenter of the M 7.6 mainshock, which is inconsistent with a simple cascade triggering model. Moreover, an M 5.9 foreshock was identified in the JMA catalog 14 s before the mainshock. Results from back-projection of high-frequency teleseismic P waves show a prolonged initial rupture process near the mainshock hypocenter lasting for ∼25 s, before propagating bi-laterally outward. Our results suggest a complex evolution process linking the earthquake swarm to the nucleation of the M 7.6 mainshock at a region of complex structures associated with the bend of a mapped large-scale reverse fault. A combination of fluid migration, aseismic slip and elastic stress triggering likely work in concert to drive both the prolonged earthquake swarm and the nucleation of the M7.6 mainshock. |
| format | Article |
| id | doaj-art-1bad162fae95497fb0ed2b5786285cdd |
| institution | Kabale University |
| issn | 2772-4670 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | Earthquake Research Advances |
| spelling | doaj-art-1bad162fae95497fb0ed2b5786285cdd2025-02-02T05:29:31ZengKeAi Communications Co. Ltd.Earthquake Research Advances2772-46702025-01-0151100332The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequenceZhigang Peng0Xinglin Lei1Qing-Yu Wang2Dun Wang3Phuc Mach4Dongdong Yao5Aitaro Kato6Kazushige Obara7Michel Campillo8School of Earth and Atomospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, United States; Corresponding author.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8567, JapanUniversité Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, University Gustave Eiffel, ISTerre, Grenoble, 38000, FranceChinese University of Geosciences, Wuhan, Hubei, 430074, ChinaSchool of Earth and Atomospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, United StatesChinese University of Geosciences, Wuhan, Hubei, 430074, ChinaEarthquake Research Institute, University of Tokyo, Bunkyo City, Tokyo, 113-0032, JapanEarthquake Research Institute, University of Tokyo, Bunkyo City, Tokyo, 113-0032, JapanUniversité Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, University Gustave Eiffel, ISTerre, Grenoble, 38000, FranceSeveral physical mechanisms of earthquake nucleation, such as pre-slip, cascade triggering, aseismic slip, and fluid-driven models, have been proposed. However, it is still not clear which model plays the most important role in driving foreshocks and mainshock nucleation for given cases. In this study, we focus on the relationship between an intensive earthquake swarm that started beneath the Noto Peninsula in Central Japan since November 2020 and the nucleation of the 2024 M 7.6 Noto Hanto earthquake. We relocate earthquakes listed in the standard Japan Meteorological Agency (JMA) catalog since 2018 with the double-different relocation method. Relocated seismicity revealed that the 2024 M 7.6 mainshock likely ruptured a thrust fault above a parallel fault where the M 6.5 Suzu earthquake occurred in May 2023. We find possible along-strike and along-dip expansion of seismicity in the first few months at the beginning of the swarm sequence, while no obvious migration pattern in the last few days before the M 7.6 mainshock was observed. Several smaller events occurred in between the M 5.5 and M 4.6 foreshocks that occurred about 4 min and 2 min before the M7.6 mainshock. The Coulomb stress changes from the M 5.5 foreshock were negative at the hypocenter of the M 7.6 mainshock, which is inconsistent with a simple cascade triggering model. Moreover, an M 5.9 foreshock was identified in the JMA catalog 14 s before the mainshock. Results from back-projection of high-frequency teleseismic P waves show a prolonged initial rupture process near the mainshock hypocenter lasting for ∼25 s, before propagating bi-laterally outward. Our results suggest a complex evolution process linking the earthquake swarm to the nucleation of the M 7.6 mainshock at a region of complex structures associated with the bend of a mapped large-scale reverse fault. A combination of fluid migration, aseismic slip and elastic stress triggering likely work in concert to drive both the prolonged earthquake swarm and the nucleation of the M7.6 mainshock.http://www.sciencedirect.com/science/article/pii/S2772467024000587 |
| spellingShingle | Zhigang Peng Xinglin Lei Qing-Yu Wang Dun Wang Phuc Mach Dongdong Yao Aitaro Kato Kazushige Obara Michel Campillo The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence Earthquake Research Advances |
| title | The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence |
| title_full | The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence |
| title_fullStr | The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence |
| title_full_unstemmed | The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence |
| title_short | The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence |
| title_sort | evolution process between the earthquake swarm beneath the noto peninsula central japan and the 2024 m 7 6 noto hanto earthquake sequence |
| url | http://www.sciencedirect.com/science/article/pii/S2772467024000587 |
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