2024-03-28T12:13:45Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/685392022-11-17T02:08:08Zhdl_2115_20039hdl_2115_116Decadal Modulation of Repeating Slow Slip Event Activity in the Southwestern Ryukyu Arc Possibly Driven by Rifting Episodes at the Okinawa TroughTu, YokoHeki, Kosukeslow slip eventGNSSslip accumulation rateRyukyu subduction zoneOkinawa Troughback-arc spreading450We 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.American Geophysical UnionJournal Articleapplication/pdfapplication/pdfhttp://hdl.handle.net/2115/68539https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/68539/3/GRL44%209308-9313.pdfhttps://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/68539/2/Supporting%20Information.pdf0094-8276Geophysical research letters4418930893132017-09-28enginfo:doi/10.1002/2017GL074455An 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.publisher