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=== Seismicity ===
The Ryukyu Arc is a site of active [[seismicity]] characterised by shallow earthquakes, given the ongoing convergence between the Philippine Sea Plate and Eurasian Plate.<ref name=":9" /> Seismic data of earthquakes have been used to detect seismic structures below the Ryukyu Arc.<ref name="a">{{cite journal |last1=Roecker |first1=S. W. |last2=Yeh |first2=Y. H. |last3=Tsai |first3=Y. B. |title=Three-dimensional P and S wave velocity structures beneath Taiwan: Deep structure beneath an arc-continent collision |journal=Journal of Geophysical Research: Solid Earth |date=1987 |volume=92 |issue=B10 |pages=10547–10570 |doi=10.1029/JB092iB10p10547|bibcode=1987JGR....9210547R |doi-access=free }}</ref> [[Low-velocity zone|Low seismic velocity zones]], which are possibly associated with the upwelling of magma, have been discovered beneath active volcanoes and the Okinawa Trough.<ref name="a" />
[[File:M≥6.0 (1960-2022) Earthquakes in the Ryukyu Arc.png|thumb|upright=2.2|M≥6.0 (1960-2022) Earthquakes in the Ryukyu Arc. Earthquake data from USGS-ANSS Catalog. Contours in 1 km interval. Figure made with GeoMapApp (www.geomapapp.org) / CC BY / CC BY (Ryan et al., 2009).<ref name="fig" />]]
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