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Space geodetic observations of repeating slow slip events beneath the Bonin Islands
| Title: | Space geodetic observations of repeating slow slip events beneath the Bonin Islands |
| Authors: | Arisa, Deasy Browse this author | | Heki, Kosuke Browse this author →KAKEN DB |
| Keywords: | Plate motions | | Satellite geodesy | | Space geodetic surveys | | Seismicity and tectonics | | Dynamics and mechanics of faulting | | Intra-plate processes |
| Issue Date: | 1-Sep-2017 |
| Publisher: | Oxford University Press |
| Journal Title: | Geophysical journal international |
| Volume: | 210 |
| Issue: | 3 |
| Start Page: | 1494 |
| End Page: | 1502 |
| Publisher DOI: | 10.1093/gji/ggx258 |
| Abstract: | The Pacific Plate subducts beneath the Philippine Sea Plate along the Izu-Bonin Trench. We investigated crustal movements at the Bonin Islands, using Global Navigation Satellite System and geodetic Very Long Baseline Interferometry data to reveal how the two plates converge in this subduction zone. These islands are located similar to 100 km from the trench, just at the middle between the volcanic arc and the trench, making these islands suitable for detecting signatures of episodic deformation such as slow slip events (SSEs). During 2007-2016, we found five SSEs repeating quasi-periodically with similar displacement patterns. In estimating their fault parameters, we assumed that the fault lies on the prescribed plate boundary, and optimized the size, shape and position of the fault and dislocation vectors. Average fault slip was similar to 5 cm, and the average moment magnitude was similar to 6.9. We also found one SSE occurred in 2008 updip of the repeating SSE in response to an M6 class interplate earthquake. In spite of the frequent occurrence of SSEs, there is no evidence for long-term strain accumulation in the Bonin Islands that may lead to future megathrust earthquakes. Plate convergence in Mariana-type subduction zones may occur, to a large extent, episodically as repeating SSEs. |
| Rights: | This article has been accepted for publication in Geophysical Journal International ©: 2017 Deasy Arisa and Kosuke Heki Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/67742 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日置 幸介
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