No latest activity reported for Halla.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Chough S K, Sohn Y K, 1990. Depostional mechanics and sequences of base surges, Songaksan tuff ring, Cheju Island, Korea. {Sedimentology}, 37: 1115-1135

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. {IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior}.

Lee M W, 1982. Petrology and geochemistry of Jeju volcanic island, Korea. {Sci Rpt Tohoku Univ}, Ser 3, 15: 177-256

Sohn Y K, 1996. Hydrovolcanic processes forming basaltic tuff rings and cones on Cheju Island, Korea. {Geol Soc Amer Bull}, 108: 1199-1211

Sohn Y K, Chough S K, 1989. Depositional processes of the Suwolbong tuff ring, Cheju Island (Korea). {Sedimentology}, 36: 837-855

Sohn Y K, Park J B, Khim B K, Park K H, Koh G W , 2003. Stratigraphy, petrochemistry and Quaternary depositional record of the Songaksan tuff ring, Jeju Island, Korea. {J Volc Geotherm Res}, 119: 1-20

Sohn Y K, Park K H, 2005. Composite tuff ring/cone complexes in Jeju Island, Korea: possible consequences of substrate collapse and vent migration. {J Volc Geotherm Res}, 141: 157-175

Tomita T, 1969. Volcanic geology of the Cenozoic alkaline petrographic province of eastern Asia. {In}: Ogura T (ed) {Geology and Mineral Resources of the Far East}, Tokyo: Univ Tokyo Press, p 139-179

The massive Halla shield volcano forms much of the 40 x 80 km Cheju (Jeju) Island, which lies 90 km south of the Korean Peninsula. Eruptions during the Pliocene and Pleistocene built a lava plateau above the roughly 100-m-deep continental shelf on which the basaltic-to-trachytic Halla shield volcano was constructed. A 400-m-wide crater truncates the 1950-m-high summit. About 360 late-Pleistocene and Holocene basaltic parasitic cones dotting the flanks of the low-angle volcano were erupted primarily along the long axis of the ENE-WSW-trending island. Most of these are scoria cones, but about 20 along the coast of the island or offshore are Pleistocene-to-Holocene tuff rings and tuff cones, and lava domes also occur. Flank eruptions continued into historical time, with the final two taking place during the 11th century.