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Decadal Modulation of Repeating Slow Slip Event Activity in the Southwestern Ryukyu Arc Possibly Driven by Rifting Episodes at the Okinawa Trough
| Title: | Decadal Modulation of Repeating Slow Slip Event Activity in the Southwestern Ryukyu Arc Possibly Driven by Rifting Episodes at the Okinawa Trough |
| Authors: | Tu, Yoko Browse this author | | Heki, Kosuke Browse this author →KAKEN DB |
| Keywords: | slow slip event | | GNSS | | slip accumulation rate | | Ryukyu subduction zone | | Okinawa Trough | | back-arc spreading |
| Issue Date: | 28-Sep-2017 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical research letters |
| Volume: | 44 |
| Issue: | 18 |
| Start Page: | 9308 |
| End Page: | 9313 |
| Publisher DOI: | 10.1002/2017GL074455 |
| Abstract: | We studied 38 slow slip events (SSEs) in 1997-2016 beneath the Iriomote Island, southwestern Ryukyu Arc, Japan, using continuous Global Navigation Satellite Systems data. These SSEs occur biannually on the same fault patch at a depth of similar to 30km on the subducting Philippine Sea Plate slab with average moment magnitudes (M-w) of similar to 6.6. Here we show that the slip accumulation rate (cumulative slip/lapse time) of these SSEs fluctuated over a decadal time scale. The rate increased twice around 2002 and 2013 concurrently with earthquake swarms in the Okinawa Trough. This suggests that episodic activations of the back-arc spreading at the Okinawa Trough caused extra southward movement of the block south of the trough and accelerated convergence at the Ryukyu Trench. |
| Rights: | An edited version of this paper was published by AGU. Copyright 2017 American Geophysical Union. Tu, Y., & Heki, K. (2017). Decadal modulation of repeating slow slip event activity in the southwestern Ryukyu Arc possibly driven by rifting episodes at the Okinawa Trough. Geophysical Research Letters, 44, 9308–9313, DOI:10.1002/2017GL074455. To view the published open abstract, go to http://dx.doi.org and enter the DOI. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/68539 |
| 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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