Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone
Abstract We have analyzed the spatial variation in coda Q in the northeastern part of a high strain rate zone, the Niigata–Kobe Tectonic Zone (NKTZ), to investigate the cause of the high strain rate by correlating coda Q with the differential strain rate and the S-wave velocity. The spatial distribu...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-06-01
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| Series: | Earth, Planets and Space |
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| Online Access: | http://link.springer.com/article/10.1186/s40623-017-0663-x |
| _version_ | 1818494360325455872 |
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| author | Masanobu Dojo Yoshihiro Hiramatsu |
| author_facet | Masanobu Dojo Yoshihiro Hiramatsu |
| author_sort | Masanobu Dojo |
| collection | DOAJ |
| description | Abstract We have analyzed the spatial variation in coda Q in the northeastern part of a high strain rate zone, the Niigata–Kobe Tectonic Zone (NKTZ), to investigate the cause of the high strain rate by correlating coda Q with the differential strain rate and the S-wave velocity. The spatial distributions of coda Q in the 2–4 and 4–8 Hz frequency bands are found to be negatively correlated with the differential strain rate. Coda Q in the 2–4 Hz frequency band is correlated spatially with the S-wave velocity at a 25 km depth, as has been reported previously. We also find a positive correlation between the perturbation of the S-wave velocity at a 10 km depth and coda Q in the 4–8 Hz frequency band, implying that the spatial distribution of coda Q in this frequency band is mainly attributed to the heterogeneity of the upper crust. This feature is different from that of the central part of the NKTZ reported previously, which indicates a difference in the cause of the high strain rate. Therefore, we suggest that the high deformation rate in the upper crust, which is characterized by a thick sediment basin, as well as that in the ductile lower crust, contributes to the generation process of the high strain rate on the surface in the northeastern part of the NKTZ. Graphical abstract . |
| first_indexed | 2024-12-10T18:05:07Z |
| format | Article |
| id | doaj.art-77b500a723524f0f85d2c261ead58bc1 |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-12-10T18:05:07Z |
| publishDate | 2017-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-77b500a723524f0f85d2c261ead58bc12022-12-22T01:38:39ZengSpringerOpenEarth, Planets and Space1880-59812017-06-016911810.1186/s40623-017-0663-xSpatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zoneMasanobu Dojo0Yoshihiro Hiramatsu1Graduate School of Natural Science and Technology, Kanazawa UniversitySchool of Natural System, College of Science and Engineering, Kanazawa UniversityAbstract We have analyzed the spatial variation in coda Q in the northeastern part of a high strain rate zone, the Niigata–Kobe Tectonic Zone (NKTZ), to investigate the cause of the high strain rate by correlating coda Q with the differential strain rate and the S-wave velocity. The spatial distributions of coda Q in the 2–4 and 4–8 Hz frequency bands are found to be negatively correlated with the differential strain rate. Coda Q in the 2–4 Hz frequency band is correlated spatially with the S-wave velocity at a 25 km depth, as has been reported previously. We also find a positive correlation between the perturbation of the S-wave velocity at a 10 km depth and coda Q in the 4–8 Hz frequency band, implying that the spatial distribution of coda Q in this frequency band is mainly attributed to the heterogeneity of the upper crust. This feature is different from that of the central part of the NKTZ reported previously, which indicates a difference in the cause of the high strain rate. Therefore, we suggest that the high deformation rate in the upper crust, which is characterized by a thick sediment basin, as well as that in the ductile lower crust, contributes to the generation process of the high strain rate on the surface in the northeastern part of the NKTZ. Graphical abstract .http://link.springer.com/article/10.1186/s40623-017-0663-xHeterogeneityDifferential strain rateS-wave velocityDuctile deformation |
| spellingShingle | Masanobu Dojo Yoshihiro Hiramatsu Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone Earth, Planets and Space Heterogeneity Differential strain rate S-wave velocity Ductile deformation |
| title | Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone |
| title_full | Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone |
| title_fullStr | Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone |
| title_full_unstemmed | Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone |
| title_short | Spatial variation in coda Q in the northeastern part of Niigata–Kobe Tectonic Zone, central Japan: implication of the cause of a high strain rate zone |
| title_sort | spatial variation in coda q in the northeastern part of niigata kobe tectonic zone central japan implication of the cause of a high strain rate zone |
| topic | Heterogeneity Differential strain rate S-wave velocity Ductile deformation |
| url | http://link.springer.com/article/10.1186/s40623-017-0663-x |
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