Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence
Abstract In subduction zones, slow slip events (SSEs) have been observed in the portion deeper than the downdip edge of seismogenic zone. However, since it is far offshore from geodetic networks on land, shallow SSEs near the trench axis are hardly observed. Despite of less quantitative than seafloo...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-09-01
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| Series: | Geoscience Letters |
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| Online Access: | https://doi.org/10.1186/s40562-023-00297-4 |
| _version_ | 1797559288682512384 |
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| author | Kei Katsumata |
| author_facet | Kei Katsumata |
| author_sort | Kei Katsumata |
| collection | DOAJ |
| description | Abstract In subduction zones, slow slip events (SSEs) have been observed in the portion deeper than the downdip edge of seismogenic zone. However, since it is far offshore from geodetic networks on land, shallow SSEs near the trench axis are hardly observed. Despite of less quantitative than seafloor geodetic observations, a method for inferring the shallow SSEs based on seismic quiescence was presented in this study. Unusual decrease in occurrence rate of M ≥ 5.0 earthquakes was found in the southwestern Kurile Islands. The occurrence rate was ∼1.3 events/year between 1977 and around 2004 and no earthquake was observed during 16 years after 2004. The spatial pattern of the seismic quiescence can be explained qualitatively by the Coulomb failure stress change due to shallow SSE and its fault plane is on the upper boundary of the subducting Pacific plate in the focal area of the 1975 tsunami earthquake. |
| first_indexed | 2024-03-10T17:43:13Z |
| format | Article |
| id | doaj.art-dcbdc57c30814399b3801c25fa46894d |
| institution | Directory Open Access Journal |
| issn | 2196-4092 |
| language | English |
| last_indexed | 2024-03-10T17:43:13Z |
| publishDate | 2023-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Geoscience Letters |
| spelling | doaj.art-dcbdc57c30814399b3801c25fa46894d2023-11-20T09:37:47ZengSpringerOpenGeoscience Letters2196-40922023-09-0110111010.1186/s40562-023-00297-4Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescenceKei Katsumata0Institute of Seismology and Volcanology, Faculty of Science, Hokkaido UniversityAbstract In subduction zones, slow slip events (SSEs) have been observed in the portion deeper than the downdip edge of seismogenic zone. However, since it is far offshore from geodetic networks on land, shallow SSEs near the trench axis are hardly observed. Despite of less quantitative than seafloor geodetic observations, a method for inferring the shallow SSEs based on seismic quiescence was presented in this study. Unusual decrease in occurrence rate of M ≥ 5.0 earthquakes was found in the southwestern Kurile Islands. The occurrence rate was ∼1.3 events/year between 1977 and around 2004 and no earthquake was observed during 16 years after 2004. The spatial pattern of the seismic quiescence can be explained qualitatively by the Coulomb failure stress change due to shallow SSE and its fault plane is on the upper boundary of the subducting Pacific plate in the focal area of the 1975 tsunami earthquake.https://doi.org/10.1186/s40562-023-00297-4Seismic quiescenceSlow slip eventKurile IslandsTsunami earthquake |
| spellingShingle | Kei Katsumata Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence Geoscience Letters Seismic quiescence Slow slip event Kurile Islands Tsunami earthquake |
| title | Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence |
| title_full | Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence |
| title_fullStr | Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence |
| title_full_unstemmed | Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence |
| title_short | Slow slip event in the focal area of the 1975 Kurile tsunami earthquake inferred from unusual long-term seismic quiescence |
| title_sort | slow slip event in the focal area of the 1975 kurile tsunami earthquake inferred from unusual long term seismic quiescence |
| topic | Seismic quiescence Slow slip event Kurile Islands Tsunami earthquake |
| url | https://doi.org/10.1186/s40562-023-00297-4 |
| work_keys_str_mv | AT keikatsumata slowslipeventinthefocalareaofthe1975kuriletsunamiearthquakeinferredfromunusuallongtermseismicquiescence |