Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases
Abstract Distinct later phases of waves with rich high-frequency (> 8 Hz) components were observed for intraslab earthquakes that occurred at intermediate depths, particularly at depths exceeding 100 km, in the northeastern (NE) Japan subduction zone. These high-frequency later phases (HFLPs) sho...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-02-01
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| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40623-021-01361-z |
| _version_ | 1818610043140964352 |
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| author | Takahiro Shiina Kei Katsumata Kiyoshi Yomogida Aitaro Kato |
| author_facet | Takahiro Shiina Kei Katsumata Kiyoshi Yomogida Aitaro Kato |
| author_sort | Takahiro Shiina |
| collection | DOAJ |
| description | Abstract Distinct later phases of waves with rich high-frequency (> 8 Hz) components were observed for intraslab earthquakes that occurred at intermediate depths, particularly at depths exceeding 100 km, in the northeastern (NE) Japan subduction zone. These high-frequency later phases (HFLPs) showed anomalously large peak-amplitude delays, up to ~ 50 s after direct S-wave arrivals at stations in the backarc region. Using a source-scanning algorithm, we investigated the locations of passing points affecting the propagation of HFLPs. The passing points were estimated to be in the forearc region in the entire NE Japan, indicating that HFLPs are scattered waves that pass through the forearc region. The propagating HFLPs seem to bypass the backarc mantle wedge, as a consequence of the distinct attenuation contrast in the mantle wedge across the volcanic front in NE Japan. These HFLP observations suggest that the high-attenuation zone in the backarc mantle wedge controls propagations of the high-frequency waves of intraslab earthquakes, in addition to the scatterers possibly locate in the forearc region. |
| first_indexed | 2024-12-16T15:08:09Z |
| format | Article |
| id | doaj.art-dbd19b43cc6b4bbeb0a230a23fa66472 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-16T15:08:09Z |
| publishDate | 2021-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-dbd19b43cc6b4bbeb0a230a23fa664722022-12-21T22:27:02ZengSpringerOpenEarth, Planets and Space1880-59812021-02-0173111310.1186/s40623-021-01361-zAttenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phasesTakahiro Shiina0Kei Katsumata1Kiyoshi Yomogida2Aitaro Kato3Geological Survey of Japan, National Institute of Advanced Industrial Science and TechnologyInstitute of Seismology and Volcanology, Faculty of Science, Hokkaido UniversityEarth and Planetary Dynamics, Graduate School of Science, Hokkaido UniversityEarthquake Research Institute, The University of TokyoAbstract Distinct later phases of waves with rich high-frequency (> 8 Hz) components were observed for intraslab earthquakes that occurred at intermediate depths, particularly at depths exceeding 100 km, in the northeastern (NE) Japan subduction zone. These high-frequency later phases (HFLPs) showed anomalously large peak-amplitude delays, up to ~ 50 s after direct S-wave arrivals at stations in the backarc region. Using a source-scanning algorithm, we investigated the locations of passing points affecting the propagation of HFLPs. The passing points were estimated to be in the forearc region in the entire NE Japan, indicating that HFLPs are scattered waves that pass through the forearc region. The propagating HFLPs seem to bypass the backarc mantle wedge, as a consequence of the distinct attenuation contrast in the mantle wedge across the volcanic front in NE Japan. These HFLP observations suggest that the high-attenuation zone in the backarc mantle wedge controls propagations of the high-frequency waves of intraslab earthquakes, in addition to the scatterers possibly locate in the forearc region.https://doi.org/10.1186/s40623-021-01361-zHigh-frequency later phaseIntraslab earthquakeSeismic wave scatteringS-wave attenuation |
| spellingShingle | Takahiro Shiina Kei Katsumata Kiyoshi Yomogida Aitaro Kato Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases Earth, Planets and Space High-frequency later phase Intraslab earthquake Seismic wave scattering S-wave attenuation |
| title | Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases |
| title_full | Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases |
| title_fullStr | Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases |
| title_full_unstemmed | Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases |
| title_short | Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases |
| title_sort | attenuation contrast in mantle wedge across the volcanic front of northeastern japan that controls propagations of high frequency s wave later phases |
| topic | High-frequency later phase Intraslab earthquake Seismic wave scattering S-wave attenuation |
| url | https://doi.org/10.1186/s40623-021-01361-z |
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