Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records
Abstract Seismic interferometry is one of the most effective techniques for detecting temporal variations in seismic velocity caused by large earthquakes. Before the 2011 Tohoku-Oki earthquake (M w 9.0) near the Japan Trench, a slow slip event (SSE, M w 7.0) and low-frequency tremors were observed n...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-12-01
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| Series: | Progress in Earth and Planetary Science |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40645-018-0240-3 |
| _version_ | 1818136324962516992 |
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| author | Miyuu Uemura Yoshihiro Ito Kazuaki Ohta Ryota Hino Masanao Shinohara |
| author_facet | Miyuu Uemura Yoshihiro Ito Kazuaki Ohta Ryota Hino Masanao Shinohara |
| author_sort | Miyuu Uemura |
| collection | DOAJ |
| description | Abstract Seismic interferometry is one of the most effective techniques for detecting temporal variations in seismic velocity caused by large earthquakes. Before the 2011 Tohoku-Oki earthquake (M w 9.0) near the Japan Trench, a slow slip event (SSE, M w 7.0) and low-frequency tremors were observed near the trench. Here, we applied a seismic interferometry technique using ambient noise to data from 17 ocean bottom seismometers (OBSs) installed above the focal region before the main shock. We used our technique to detect temporal variations in seismic velocity caused by the main shock, SSE, and low-frequency tremors. In the region above the large coseismic slip area, we detected a 1–2% seismic velocity decrease after the main shock. In addition, we observed very small temporal increases in seismic velocity near the SSE fault during the initial SSE stage. Moreover, for most of the OBSs, we observed temporal variations in the autocorrelation functions (ACFs) during the low-frequency tremors. These may have been caused by temporal variations in the ambient noise source distributions, resulting from low-frequency tremors. These results suggest the possibility of detecting low-frequency tremors using ACF monitoring. |
| first_indexed | 2024-12-11T09:38:36Z |
| format | Article |
| id | doaj.art-0bfaf6bf18d346499011a26e440b2c86 |
| institution | Directory Open Access Journal |
| issn | 2197-4284 |
| language | English |
| last_indexed | 2024-12-11T09:38:36Z |
| publishDate | 2018-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Progress in Earth and Planetary Science |
| spelling | doaj.art-0bfaf6bf18d346499011a26e440b2c862022-12-22T01:12:44ZengSpringerOpenProgress in Earth and Planetary Science2197-42842018-12-015111610.1186/s40645-018-0240-3Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s recordsMiyuu Uemura0Yoshihiro Ito1Kazuaki Ohta2Ryota Hino3Masanao Shinohara4Kyoto UniversityDisaster Prevention Research Institute, Kyoto UniversityDisaster Prevention Research Institute, Kyoto UniversityIntemational Research Institute of Disaster Science, Tohoku UniversityDepartment of Earth and Planetary Science, Tokyo UniversityAbstract Seismic interferometry is one of the most effective techniques for detecting temporal variations in seismic velocity caused by large earthquakes. Before the 2011 Tohoku-Oki earthquake (M w 9.0) near the Japan Trench, a slow slip event (SSE, M w 7.0) and low-frequency tremors were observed near the trench. Here, we applied a seismic interferometry technique using ambient noise to data from 17 ocean bottom seismometers (OBSs) installed above the focal region before the main shock. We used our technique to detect temporal variations in seismic velocity caused by the main shock, SSE, and low-frequency tremors. In the region above the large coseismic slip area, we detected a 1–2% seismic velocity decrease after the main shock. In addition, we observed very small temporal increases in seismic velocity near the SSE fault during the initial SSE stage. Moreover, for most of the OBSs, we observed temporal variations in the autocorrelation functions (ACFs) during the low-frequency tremors. These may have been caused by temporal variations in the ambient noise source distributions, resulting from low-frequency tremors. These results suggest the possibility of detecting low-frequency tremors using ACF monitoring.http://link.springer.com/article/10.1186/s40645-018-0240-3Ambient noiseAutocorrelation functionSeismic interferometrySlow slip event |
| spellingShingle | Miyuu Uemura Yoshihiro Ito Kazuaki Ohta Ryota Hino Masanao Shinohara Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records Progress in Earth and Planetary Science Ambient noise Autocorrelation function Seismic interferometry Slow slip event |
| title | Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records |
| title_full | Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records |
| title_fullStr | Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records |
| title_full_unstemmed | Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records |
| title_short | Spatio-temporal changes in the seismic velocity induced by the 2011 Tohoku-Oki earthquake and slow slip event revealed from seismic interferometry, using ocean bottom seismometer’s records |
| title_sort | spatio temporal changes in the seismic velocity induced by the 2011 tohoku oki earthquake and slow slip event revealed from seismic interferometry using ocean bottom seismometer s records |
| topic | Ambient noise Autocorrelation function Seismic interferometry Slow slip event |
| url | http://link.springer.com/article/10.1186/s40645-018-0240-3 |
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