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Hargy

Stratovolcano · Papua New Guinea · 1148m

Lake Hargy (lower right) lies in the SE corner of the 10 x 12 km wide Hargy caldera. The Lobu River drains the lake through a notch in the northern caldera rim. The post-caldera cone of Galloseulo lies beneath the large cloud bank in the center of the image, about halfway from the lake to the Bismarck Sea. The Toiru River cuts across the bottom of the image. Small eruptions have taken place at Galloseulo over the past 7,000 years, the last occurring about 1,000 years ago.
Lake Hargy (lower right) lies in the SE corner of the 10 x 12 km wide Hargy caldera. The Lobu River drains the lake through a notch in the northern caldera rim. The post-caldera cone of Galloseulo lies beneath the large cloud bank in the center of the image, about halfway from the lake to the Bismarck Sea. The Toiru River cuts across the bottom of the image. Small eruptions have taken place at Galloseulo over the past 7,000 years, the last occurring about 1,000 years ago. · Photo: NASA Landsat image, 2000 (courtesy of Hawaii Synergy Project, Univ. of Hawaii Institute of Geophysics & Planetology).
Type
Stratovolcano
Country
Papua New Guinea
Region
Southwestern Pacific Volcanic Regions / Bismarck Volcanic Arc
Elevation
1148m
Coordinates
-5.330, 151.100
Last eruption
950
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Dacite
Geological summary

This little-known volcano is one of several major calderas on the island of New Britain. The 10 x 12 km Hargy caldera, whose floor is 150 m above sea level, contains an inner caldera with a steep west-facing wall. A caldera lake on the SE side drains through a narrow gap in the northern caldera wall. The latest caldera-forming eruption of Hargy volcano took place about 11,000 years ago. The dacitic Galloseulo lava cone rises above and partially overtops the western rim of the caldera. A double crater occupies a larger 700-m-wide crater. Numerous small eruptions have taken place at Galloseulo over the past 7000 years, the last occurring about 1000 years ago.

From Wikipedia

Hargy is a large volcanic caldera on the island of New Britain, Papua New Guinea. The caldera measures 12 km (7.5 mi) by 10 km (6.2 mi), and its floor is located at 150 m (490 ft) above sea level. It also hosts an inner-caldera with a steep west-facing wall. Lake Hargy, located within the caldera, drains through a narrow river that runs along the northern wall. The caldera-forming eruption occurred approximately 11,000 years ago. At the western part of the caldera rises Galloseulo, a post-caldera dacitic lava cone with a 700 m (2,300 ft)-wide crater, occupied by a pair of smaller craters. Galloseulo has produced many small eruptions in the past 7,000 years, with the most recent in 950 CE. In September 1990, minor fumarolic activity was observed in the western summit crater of Galloseulo.

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Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
5050 BCE~4850 BCE · 1 eruptions · max VEI ?750~950 · 1 eruptions · max VEI ?5050 BCE3650 BCE2050 BCE650 BCE750

Detailed timeline

  1. 950VEI ?Geological estimate
    950 – Ongoing
    Galloseulo
  2. 5050 BCEVEI ?Geological estimate
    BCE 5050 – Ongoing
    Galloseulo

External links

⚠ For reference only. Not for emergency response.