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Okinawa plate
Type	Minor
Movement	south-east
Speed	54mm/year
Features	Ryuku Islands, Kagoshima Prefecture (Ōsumi Peninsula, Satsuma Peninsula), Taiwan (New Taipei City, Keelung City, Yilan County), East China Sea, Kagoshima Bay, Okinawa Trough
Relative to the African plate

The Okinawa plate, or Okinawa platelet, is a minor continental tectonic plate in the northern and eastern hemispheres stretching from the northern end of Taiwan to the southern tip of the island of Kyūshū. The Okinawa plate hosts typical earthquakes, like the 1911 Kikai Island earthquake, and various types of slow earthquakes, including low frequency earthquakes, very low frequency earthquakes, tremor, and slow slip events.

Boundaries

The eastern side of the Okinawa plate forms a convergent boundary with the Philippine Sea plate, forming the Ryukyu Trench and the island arc that forms the Ryukyu Islands. The Okinawa plate is bounded on the western side by the Okinawa Trough, a back arc basin and divergent boundary with the Yangtze plate. A section of the southern boundary between the Okinawa plate and the Philippine Sea plate is a former subduction zone that now accommodates oblique slip and was the location of the 1771 Great Yaeyama Tsunami. The northern side of the Okinawa plate is bordered by the Amur Plate.

References

1. Sibuet, Jean-Claude; Letouzey, Jean; Barbier, Florence; Charvet, Jacques; Foucher, Jean-Paul; Hilde, Thomas W. C.; Kimura, Masaaki; Chiao, Ling-Yun; Marsset, Bruno (1987). "Back Arc Extension in the Okinawa Trough". Journal of Geophysical Research: Solid Earth. 92 (B13): 14041–14063. Bibcode:1987JGR....9214041S. doi:10.1029/JB092iB13p14041. ISSN 2156-2202. S2CID 55267835.
2. Lin, Jing-Yi; Sibuet, Jean-Claude; Lee, Chao-Shing; Hsu, Shu-Kun; Klingelhoefer, Frauke; Auffret, Yves; Pelleau, Pascal; Crozon, Jacques; Lin, Cheng-Horng (2009). "Microseismicity and faulting in the southwestern Okinawa Trough". Tectonophysics. 466 (3–4): 268–280. Bibcode:2009Tectp.466..268L. doi:10.1016/j.tecto.2007.11.030. ISSN 0040-1951.
3. Katsumata, Akio; Kamaya, Noriko (2003). "Low-frequency continuous tremor around the Moho discontinuity away from volcanoes in the southwest Japan". Geophysical Research Letters. 30 (1): 20–1-20-4. Bibcode:2003GeoRL..30.1020K. doi:10.1029/2002gl015981. ISSN 0094-8276. S2CID 67820855.
4. Nakamura, Mamoru; Sunagawa, Naoya (2015-02-24). "Activation of very low frequency earthquakes by slow slip events in the Ryukyu Trench". Geophysical Research Letters. 42 (4): 1076–1082. Bibcode:2015GeoRL..42.1076N. doi:10.1002/2014gl062929. ISSN 0094-8276.
5. Yamashita, Y.; Yakiwara, H.; Asano, Y.; Shimizu, H.; Uchida, K.; Hirano, S.; Umakoshi, K.; Miyamachi, H.; Nakamoto, M. (2015-05-07). "Migrating tremor off southern Kyushu as evidence for slow slip of a shallow subduction interface". Science. 348 (6235): 676–679. Bibcode:2015Sci...348..676Y. doi:10.1126/science.aaa4242. ISSN 0036-8075. PMID 25954006. S2CID 206634346.
6. Nishimura, Takuya (2014-10-11). "Short-term slow slip events along the Ryukyu Trench, southwestern Japan, observed by continuous GNSS". Progress in Earth and Planetary Science. 1 (1). doi:10.1186/s40645-014-0022-5. ISSN 2197-4284.
7. Bird, Peter (2003). "An updated digital model of plate boundaries: UPDATED MODEL OF PLATE BOUNDARIES". Geochemistry, Geophysics, Geosystems. 4 (3). Bibcode:2003GGG.....4.1027B. doi:10.1029/2001GC000252.
8. Okamura, Yukinobu; Nishizawa, Azusa; Fujii, Yushiro; Yanagisawa, Hideaki (2018-09-11). "Accretionary prism collapse: a new hypothesis on the source of the 1771 giant tsunami in the Ryukyu Arc, SW Japan". Scientific Reports. 8 (1): 13620. Bibcode:2018NatSR...813620O. doi:10.1038/s41598-018-31956-8. ISSN 2045-2322. PMC 6134009. PMID 30206405.

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