Imaging of Lithospheric Structure Beneath Jeju Volcanic Island by Teleseismic Traveltime Tomography

A prominent low-velocity anomaly beneath Jeju Volcanic Island, identified through teleseismic traveltime tomography, reveals the presence of a magmatic system with potential partial melting at depths of 50–60 km. This anomaly branches into shallower low-velocity zones (10–45 km), suggesting complex magma interactions within the lithosphere. The study, conducted using data from 20 broadband seismometers deployed over two years, also highlights relatively high-velocity zones to the north, east, and west of the island, indicating thicker lithospheric structures at the southern margin of the continental lithosphere beneath the Korean Peninsula. These findings imply that focused decompressional melting at sublithospheric depths and intricate magma dynamics have shaped Jeju Island's unique intraplate volcanism.

Song, J.-H., Kim, S., Rhie, J., Lee, S.-H., Kim, Y., & Kang, T.-S. (2018). Imaging of Lithospheric Structure Beneath Jeju Volcanic Island by Teleseismic Traveltime Tomography. Journal of Geophysical Research: Solid Earth, 123(8), 6784–6801. Portico. https://doi.org/10.1029/2018jb015979