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Shear-wave velocity (vs) structures beneath two seismic stations, JJU and JJB on the flanks of the volcano Halla on Jeju island, Korea, were estimated by receiver-function inversion and H-κ stacking applied to 150 teleseismic events (MW ≥ 5.5) recorded since 2007. PS waves converted at the Moho discontinuity does not appear clearly for northwesterly back-azimuths (207 ~ 409 o , average 308 o ) at station JJU and southeasterly back-azimuths (119 ~ 207 o , average 163 o ) at station JJB. This may be due to a gradual velocity increase at Moho or heterogeneity within the crust. The vs models derived by inversion of receiver functions indicate a distinct low velocity layer (vs ≤ 3.5 km/s; LVL) within the crust and a gradual increase in vs in the depth interval of 30 to 40 km. Within the radius of 18 km beneath station JJB, the LVL occurs at depths of 14 ~ 26 km and the 'Moho' (vs ≥ 4.3 km/s) is at 34 km depth. Ten kilometers to the west, within the radius of 16 km beneath station JJU, both the LVL and the Moho are significantly shallower, at depths of 14 to 24 km and 30 km, respectively. H-κ analyses for stations JJU and JJB yield estimated crustal thickness of 29 and 33 km and vp/vs ratios of 1.64 and 1.75, respectively. The lesser vp/vs ratio was derived for rocks nearest to the peak of the volcano.

S-Wave Velocities Beneath Jeju Island, Korea, Using Inversion of Receiver Functions and the H-κ Stacking Method