Increased activity at Raung volcano, Alert Level raised to 2 – Aviation Color Code to Orange, Indonesia

raung-volcano-indonesia-january-2021

Indonesian Raung volcano started erupting at 22:18 UTC on January 20, 2020, prompting authorities to raise the Alert Level to 2 and the Aviation Color Code to Orange.

At 00:30 UTC on January 21, ash was rising about 3.7 km (12 000 feet) above sea level and drifting east. This is some 500 m (1 640 feet) from the top of the volcano.

The Aviation Color Code was raised to Orange and the Alert Level to 2 (on a scale of 1 – 4). It was on level 1 since November 27, 2020.

The public is warned not to carry out any activity within a 2 km (1.2 miles) radius from the peak.

A Deep Volcanic earthquake was recorded beneath the volcano on January 20 and followed by a non-harmonic tremor, indicating a magma supply from the depth below the crater, PVMBG reported.

Image credit: PVMBG

A series of eruptions occurred at the volcano from July to October 2020, resulting in ashfall limited to the summit crater. It was the first eruptive activity at the volcano since 2015.

The volcano has one confirmed VEI 5 eruption in 1593 and one VEI 4 in 1638.

Geological summary

Raung, one of Java's most active volcanoes, is a massive stratovolcano in easternmost Java that was constructed SW of the rim of Ijen caldera.

The unvegetated summit is truncated by a dramatic steep-walled, 2 km (1.2 miles) wide caldera that has been the site of frequent historical eruptions.

A prehistoric collapse of Gunung Gadung on the W flank produced a large debris avalanche that traveled 79 km (49 miles), reaching nearly to the Indian Ocean.

Raung contains several centers constructed along a NE-SW line, with Gunung Suket and Gunung Gadung stratovolcanoes being located to the NE and W, respectively. (GVP)

Featured image credit: PVMBG

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