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Home » Ijen Volcano Indonesia » Ijen Volcano Indonesia | the largest acidic volcanic lake

Ijen Volcano Indonesia, 8.05 S, 114.24 E, summit elevation 2386 m, Stratovolcanoes

Ijen Volcano Indonesia | the largest acidic volcanic lake

Ijen volcano Indonesia contains the world’s largest acidic volcanic lake. It is located in East Java, Indonesia.

The Ijen volcanic complex consists of several stratovolcanoes and cinder cones and a 20 km wide caldera. Ijen caldera is the largest in Java. The size of the crater is about 960 m x 600 m. The primary dangers at Ijen are pyroclastic flows, lahars, and lava flows.

Thermal springs are located on Ijen lakeshore. The lakeshore fumarole discharges (170-245°C) have both a magmatic and a hydrothermal component.

Ijen Volcano Indonesia | the largest acidic volcanic lake

Post Caldera Eruptions
Post-caldera activity consists of phreatomagmatic, phreatic, strombolian, and Plinian eruptions from 22 separate vents. Current volcanic activity is located at Kawah Ijen which has a depth of 200-300 m. Most eruptions at the volcano have been phreatic.

2018 Eruption |Ijen Volcano Indonesia

An explosion occurred in the crater at Ijen volcano on 21st March 2018.
27 people were affected by gas and required medical treatment at a local hospital.

2011 Activity |Ijen Volcano Indonesia

Between 8-13 December 2011 harmonic tremors and 77 shallow volcanic earthquakes were recorded at the volcano. Seismicity began to increase in October 2011 and continued high levels of shallow volcanic earthquakes continued at the volcano into December. Between 1-13 December visual observations showed brown-white emissions with a weak pressure rising 50-200 m above the crater. On 15th December 2011, the alert status at Ijen volcano was raised to level 2 (out of a maximum of 4). A 1 km exclusion zone was placed around the crater. This affected both visitors and sulfur miners.

2004 Activity
An increase in activity at Kawah Ijen resulted in the area being closed to visitors in June 2004. The lake changed color from green to white, and sulfurous rocks and foam were emitted.

2002 Eruptions
A small explosion occurred at Ijen volcano on 29th July 2002. Ash emissions continued until mid-August.

2000 Eruptions
Sulfur emissions entered the cabin of a Singapore to Denpasar flight on 15th July 2000. Ijen volcano was suspected as the source of the emissions. Gray emissions occurred from the volcano in mid-August.

1999 Eruptions
Two phreatic explosions occurred on 28th June 1999. The eruptions were heard 2 km from the lake.

1994 Eruptions
On 3rd February 1994, a small phreatic eruption occurred at the southern end of the crater lake.

1993 Eruptions
Three phreatic eruptions occurred at Ijen volcano on 3-4 July 1993. The eruption was preceded by a change in lake color from whitish-green to brown. On 5th July rockfalls were observed at the inner crater south wall. Another phreatic eruption occurred on 7th July, with rumbling noises heard at the sulfur weighing station 750 m from the lake. Two phreatic eruptions occurred on 1st August and were heard at the weighing station.

1936 Eruption
Upwelling eruptions began at Kawah Ijen on 7th November 1936. Between 7-14 November the eruptions occurred west of the deepest part of the lake at a depth of 170 m. On 15th November, eruptions occurred 200 m ESE at a depth of 198 m. During the larger eruptions, waves swept over the weir on the western side of the lake. Eruptions stopped on 17th November.

1817 Eruption
The eruption of Ijen in 1817 lasted 33 days. The crater lake was ejected. Large areas around the volcano were inundated, especially the plain of Rogodiambi. Several villages were destroyed, and many people and animals were killed.

Further reading
Delmelle, P. and Bernard, A., 1994. Geochemistry, mineralogy, and chemical modeling of the acid crater lake of Kawah Ijen Volcano, Indonesia. Geochimica et cosmochimica acta58(11), pp.2445-2460.

Delmelle, P., Bernard, A., Kusakabe, M., Fischer, T.P. and Takano, B., 2000. Geochemistry of the magmatic-hydrothermal system of Kawah Ijen volcano, East Java, Indonesia. Journal of Volcanology and Geothermal Research97(1-4), pp.31-53.

Ijen Volcano Eruptions

2002, 2000, 1999, 1994, 1993, 1952, 1936, 1917, 1817, 1796.
640 BC ± 50 yr (most recent magmatic eruption).

How To Get To Ijen From Bali

While there are a few tour companies offering this service, with round-trip coaches/vans and included bottled water, they tend to be quite expensive. If you go in a large group I didn’t see anything less than $100/person (not including the Ijen entrance fee), and if you are a travel couple or going solo and want a private driver expect to pay $150-250 for a minivan.

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