Explosieve uitbarsting vulkaan Ruang: 10000+ geevacueerd

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Hundreds of people evacuated from Island after Ruang eruption
JAKARTA: At least 800 people in Indonesia's North Sulawesi province have been evacuated after multiple eruptions of the area's Ruang volcano, which for days has spewed lava and ash clouds into the sky, the country's volcanology agency said on Wednesday (Apr 17).

The volcano, located on Ruang island about 100km from the provincial capital Manado, has erupted more than three times since Tuesday..

Authorities have raised the alert level to the second highest level following the increased activity, Heruningtyas Desi Purnamasari, an official at Indonesia's Center for Volcanology and Geological Hazard Mitigation (PVMBG), told Reuters.

The eruption of Mt Ruang were triggered by recent earthquakes on the island, with the mountain emitting dangerous and "explosive hot clouds" as high as 1.8km into the sky, she said.

"We must clear the island because we anticipate there could be more eruptions. No activity is allowed within four kilometres from the crater," she said.

Footage seen by Reuters showed flows of red lava streaming down the mountain, reflected in the waters below, and billowing clouds of grey ash above its crater.

Ruang island is home to about 838 residents, most of whom have now been evacuated to the nearest island Tagulandang, said Heruningtyas.

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Plinian eruptions are extremely explosive eruptions, producing ash columns that extend many tens of miles into the stratosphere and that spread out into an umbrella shape. These large eruptions produce widespread deposits of fallout ash. Eruption columns may also collapse due to density to form thick pyroclastic flows.

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Duizenden geëvacueerd na vulkaanuitbarstingen op Sulawesi

Ruim 11.000 mensen in het noorden van Indonesië, die in de buurt van de Ruang-vulkaan wonen, moeten hun huis verlaten. De vulkaan op het eiland Sulawesi barstte de afgelopen dagen verschillende keren uit. Daardoor zijn er zorgen dat de berg van 725 meter hoog zal instorten en zo een tsunami zal veroorzaken.

De vulkaan in Noord-Sulawesi barstte dinsdag voor het eerst uit en gisteren volgden nog vier uitbarstingen. De afgelopen 24 uur waren er ten minste vijf grote uitbarstingen, meldt het Indonesische Centrum voor Vulkanologie en Geologische Rampenbestrijding.

Het 'vulkaanalarm' is naar het hoogste niveau bijgesteld en een regionaal vliegveld is gesloten. Paarse bliksemflitsen scheuren de lucht boven de uitbarstende vulkaan, tonen video's op sociale media.

As te dichtbij
Gisteren verlieten al 800 inwoners het gebied. "We rennen, jongens", zei een getuige die de uitbarsting filmde terwijl hij zich haastte om weg te komen. "We vertrekken omdat de as dichtbij komt."

De autoriteiten roepen mensen op om in ieder geval op zes kilometer afstand te blijven van de berg. In eerste instantie was dat vier kilometer, meldt Al Jazeera.

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Massive eruption at Ruang volcano forces mass evacuation, ash to 16.7 km (55 000 feet) a.s.l., Indonesia

A series of powerful eruptions took place at Ruang volcano in Indonesia’s North Sulawesi province starting at 17:08 UTC on April 16, 2024 (01:08 LT, April 17). As a result, the Aviation Color Code was raised to Red, the Alert Level to 3 of 4, and local authorities started evacuating more than 800 people living on the island as a preventive measure. The last eruptive episode at this volcano was in September 2002 (VEI 4).

Authorities have raised the alert level to the second highest level (3 of 4), Heruningtyas Desi Purnamasari, an official at Indonesia’s Center for Volcanology and Geological Hazard Mitigation (PVMBG) said, adding that the eruptions were triggered by recent earthquakes on the island.
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“We must clear the island [population ~838] because we anticipate there could be more eruptions. No activity is allowed within 4 km (2.5 miles) from the crater,” she said.

According to the Darwin VAAC Volcanic Ash Advisory released at 18:50 UTC, a volcanic ash plume to 12.2 km (40 000 feet) above sea level detached from the summit and was expected to dissipate within 9 – 12 hours. Meanwhile, volcanic ash to 3 km (10 000 feet) a.s.l. — moving SW — is expected to dissipate within 6 hours.

Darwin VAAC advisory released at 23:13 UTC mentions volcanic ash plume rising to 13.7 km (45 000 feet) a.s.l. and moving W/NW, while low-level eruptions to 5 and 1.5 km (15 000 and 5 000 feet) a.s.l. continue at the volcano.

At 15:10 UTC, the volcanic ash cloud reached 16.7 km (55 000 feet) a.s.l.

The last eruptive episode at the volcano took place from September 25 to 29, 2002, and had an estimated Volcanic Explosivity Index of 4.

Ruang is the southernmost volcano in the Sangihe Island arc, north of Sulawesi Island; it is not the better-known Raung volcano on Java. The 4 x 5 km (2.5 x 3.1 miles) island volcano is across a narrow strait SW of the larger Tagulandang Island.

Its summit contains a crater partially filled by a lava dome initially emplaced in 1904. Explosive eruptions recorded since 1808 have often been accompanied by lava dome formation and pyroclastic flows that have damaged inhabited areas.

Updates
07:28 UTC, April 18

According to Darwin VAAC Volcanic Ash Advisory released at 05:30 UTC on April 18, volcanic ash to 16.7 km (55 000 feet) a.s.l. is moving west, volcanic ash to 12.2 km (40 000 feet) a.s.l. is also moving west and is expected to dissipate within 6 hours; while volcanic ash to 7.6 km (25 000 feet) a.s.l. is moving east. Localized volcanic ash emissions to 4.6 km (15 000 feet) a.s.l. are expected over the next 18 hours.

The Alert Level was raised to the highest — 4 of 4 — and the airport in Manado, located about 100 km (62 miles) SSE of the volcano, was temporarily closed.

A warning was also issued about a possible tsunami. “The communities in Tagulandang island, particularly those residing near the beach, should be on alert for the potential ejection of incandescent rocks, hot clouds discharges, and tsunami caused by the collapse of the volcano’s body into the sea,” Hendra Gunawan, head of Indonesia’s volcanology agency, said on Wednesday.