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Hallasan

Halla

Shield volcano · South Korea · 1919m

The massive Halla shield volcano, seen here from the south, forms much of the 40 x 80 km Cheju Island, which lies 90 km S of the Korean Peninsula. More than 360 late-Pleistocene and Holocene basaltic cones on the flanks of the low-angle volcano were erupted primarily along the long axis of the NE-SW-trending island. Most of these are scoria cones, but about 10 along the coast are Pleistocene tuff rings and tuff cones. Flank eruptions continued into historical time, with the final two taking place during the 11th century.
The massive Halla shield volcano, seen here from the south, forms much of the 40 x 80 km Cheju Island, which lies 90 km S of the Korean Peninsula. More than 360 late-Pleistocene and Holocene basaltic cones on the flanks of the low-angle volcano were erupted primarily along the long axis of the NE-SW-trending island. Most of these are scoria cones, but about 10 along the coast are Pleistocene tuff rings and tuff cones. Flank eruptions continued into historical time, with the final two taking place during the 11th century. · Photo: Photo by Norm Banks, 1980 (U.S. Geological Survey). · Wikimedia Commons
Type
Shield volcano
Country
South Korea
Region
Eastern Asia Volcanic Regions / Central East Asia Volcanic Province
Elevation
1919m
Coordinates
33.361, 126.530
Last eruption
1007
Tectonic setting
Intraplate / Continental crust (> 25 km)
Landform
Shield
Major rock type
Basalt / Picro-Basalt
Geological summary

The massive Halla shield volcano forms much of the 40 x 80 km Cheju (Jeju) Island, which lies 90 km S 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 edifice was constructed. A 400-m-wide crater truncates the summit. About 360 late-Pleistocene and Holocene basaltic cones across the flanks 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 or offshore are Pleistocene-to-Holocene tuff rings and tuff cones; lava domes also occur. The latest two eruptions took place during the 11th century.

From Wikipedia

Hallasan (Korean: 한라산) is a shield volcano comprising much of Jeju Island in South Korea. Its summit, at 1,947 m (6,388 ft), is the highest point in the country. The area around the mountain is a designated national park, named Hallasan National Park. Hallasan is commonly considered to be one of the three main mountains of South Korea, along with Jirisan and Seoraksan.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
2830 BCE~2638 BCE · 1 eruptions · max VEI ?2063 BCE~1871 BCE · 1 eruptions · max VEI ?815~1007 · 2 eruptions · max VEI ?2830 BCE1871 BCE911 BCE144 BCE815

Detailed timeline

  1. 1007VEI ?Observed
    1007 – Ongoing
  2. 1002VEI ?Observed
    1002 – Ongoing
  3. 2050 BCE (±200 yrs)VEI ?Geological estimate
    BCE 2050 – Ongoing
    SW flank (Songaksan tuff ring)
  4. 2830 BCE (±50 yrs)VEI ?Geological estimate
    BCE 2830 – Ongoing
    NE flank (Ilchulbong tuff cone)

External links

⚠ For reference only. Not for emergency response.