Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan
Abstract The down-dip limit of the seismogenic zone and up-dip and down-dip limits of the deep low-frequency tremors in southwest Japan are clearly imaged by the hypocentre distribution. Previous studies using smooth constraints in inversion analyses estimated that long-term slow slip events (L-SSEs...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2017-07-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-017-06185-0 |
| _version_ | 1818995186227740672 |
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| author | Ryoko Nakata Hideitsu Hino Tatsu Kuwatani Shoichi Yoshioka Masato Okada Takane Hori |
| author_facet | Ryoko Nakata Hideitsu Hino Tatsu Kuwatani Shoichi Yoshioka Masato Okada Takane Hori |
| author_sort | Ryoko Nakata |
| collection | DOAJ |
| description | Abstract The down-dip limit of the seismogenic zone and up-dip and down-dip limits of the deep low-frequency tremors in southwest Japan are clearly imaged by the hypocentre distribution. Previous studies using smooth constraints in inversion analyses estimated that long-term slow slip events (L-SSEs) beneath the Bungo Channel are distributed smoothly from the down-dip part of the seismogenic zone to the up-dip part of the tremors. Here, we use fused regularisation, a type of sparse modelling suitable for detecting discontinuous changes in the model parameters to estimate the slip distribution of L-SSEs. The largest slip abruptly becomes zero at the down-dip limit of the seismogenic zone, is immediately reduced to half at the up-dip limit of the tremors, and becomes zero near its down-dip limit. Such correspondences imply that some thresholds exist in the generation processes for both tremors and SSEs. Hence, geodetic data inversion with sparse modelling can detect such high resolution in the slip distribution. |
| first_indexed | 2024-12-20T21:09:50Z |
| format | Article |
| id | doaj.art-be06898fbaf6424c98c6b091e8ef82f4 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-20T21:09:50Z |
| publishDate | 2017-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-be06898fbaf6424c98c6b091e8ef82f42022-12-21T19:26:33ZengNature PortfolioScientific Reports2045-23222017-07-01711710.1038/s41598-017-06185-0Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest JapanRyoko Nakata0Hideitsu Hino1Tatsu Kuwatani2Shoichi Yoshioka3Masato Okada4Takane Hori5Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and TechnologyDepartment of Computer Science, University of TsukubaDepartment of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and TechnologyResearch Center for Urban Safety and Security, Kobe UniversityGraduate School of Frontier Sciences, The University of TokyoResearch and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and TechnologyAbstract The down-dip limit of the seismogenic zone and up-dip and down-dip limits of the deep low-frequency tremors in southwest Japan are clearly imaged by the hypocentre distribution. Previous studies using smooth constraints in inversion analyses estimated that long-term slow slip events (L-SSEs) beneath the Bungo Channel are distributed smoothly from the down-dip part of the seismogenic zone to the up-dip part of the tremors. Here, we use fused regularisation, a type of sparse modelling suitable for detecting discontinuous changes in the model parameters to estimate the slip distribution of L-SSEs. The largest slip abruptly becomes zero at the down-dip limit of the seismogenic zone, is immediately reduced to half at the up-dip limit of the tremors, and becomes zero near its down-dip limit. Such correspondences imply that some thresholds exist in the generation processes for both tremors and SSEs. Hence, geodetic data inversion with sparse modelling can detect such high resolution in the slip distribution.https://doi.org/10.1038/s41598-017-06185-0 |
| spellingShingle | Ryoko Nakata Hideitsu Hino Tatsu Kuwatani Shoichi Yoshioka Masato Okada Takane Hori Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan Scientific Reports |
| title | Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan |
| title_full | Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan |
| title_fullStr | Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan |
| title_full_unstemmed | Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan |
| title_short | Discontinuous boundaries of slow slip events beneath the Bungo Channel, southwest Japan |
| title_sort | discontinuous boundaries of slow slip events beneath the bungo channel southwest japan |
| url | https://doi.org/10.1038/s41598-017-06185-0 |
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