Bali: Uitbarsting van de vulkaan Agung

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Vulkaan Agung op Bali minder actief; dreigingsniveau omlaag

De dreiging van een uitbarsting van vulkaan Agung op Bali is afgenomen, hebben de Indonesische autoriteiten vastgesteld. Eind september ging men er nog vanuit dat de vulkaan ieder moment kon uitbarsten.

Ruim 130.000 mensen die in een straal van 12 kilometer om de vulkaan woonden, werden geėvacueerd en ook veel mensen die verder uit de buurt woonden pakten voor de zekerheid hun koffers.

Magma

De laatste dagen is de vulkaan veel minder actief. Aanvankelijk werden dagelijks zo'n 1000 bevingen geregistreerd. Dat zou er volgens vulkanologen op wijzen dat er magma omhoog kwam binnen de vulkaan. Inmiddels worden per dag 400 bevingen geteld.

De gevarenzone rond de vulkaan is nu verlaagd van 12 naar 7,5 kilometer, dus een deel van de geėvacueerden kan naar huis terugkeren. Wel krijgen ze de waarschuwing mee niet dichter in de buurt te komen van de krater, waar nog steeds rook uitkomt.

De Agung is met 3.031 meter de hoogste berg en vulkaan van Bali. De laatste uitbarsting was in 1963. Toen vielen er zo'n duizend doden.

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Eruption at Agung volcano, Bali, Aviation Color Code raised to Orange

A small-scale eruption started at Agung volcano, Bali at 09:05 UTC (17:05 WITA) on November 21, 2017, forcing authorities to raise the Aviation Color Code from Yellow to Orange.

The best estimate of the ash-cloud top is around 3 842 m (12 294 feet) above sea level. This is about 840 m (2 778 feet) above the crater. "Ash cloud is drifting to the southeast and may be higher than what can be clearly seen by ground observations. Eruption and ash emission continues," CVGHM said 09:39 UTC.

A small-scale eruption started at Agung volcano, Bali at 09:05 UTC (17:05 WITA) on November 21, 2017, forcing authorities to raise the Aviation Color Code from Yellow to Orange.

The best estimate of the ash-cloud top is around 3 842 m (12 294 feet) above sea level. This is about 840 m (2 778 feet) above the crater. "Ash cloud is drifting to the southeast and may be higher than what can be clearly seen by ground observations. Eruption and ash emission continues," CVGHM said 09:39 UTC.

Sutopo Purwo Nugroho, the spokesman of the national disaster agency, reminded residents not to enter the exclusion zone of 6 - 7.5 km (3.7 - 4.6 miles) around the crater and to stay calm

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100000 ordered to evacuate, fears for larger eruption
About 100,000 people near Bali's Mount Agung have been ordered to evacuate as officials fear a major eruption.Indonesian authorities have raised the state of alert to its highest level, and expanded the exclusion zone around the rumbling volcano.

The island's airport has now closed, leaving thousands stranded in the tourist hotspot.
Authorities say dark smoke and ash have been billowing up to 3,400m (11,150ft) above the mountain's summit.

Officials have warned residents to stay away from rock and debris flows known as lahars, which have been spotted flowing down from the mountain.

How close is it to a major eruption?

The National Board for Disaster Management raised the alert to level four from 06:00 local time (22:00 GMT Sunday) because of "the possibility and imminent risk of disaster".

The volcano was seen emitting "continuous ash puffs" occasionally accompanied by "explosive eruptions" and "weak booms" that could be heard 12km (7 miles) away from the summit.

"The rays of fire are increasingly observed at night. This indicates the potential for a larger eruption is imminent,

twitter:

janinekrippner twitterde op dinsdag 28-11-2017 om 09:05:46 Starting at 13:32 WITA, the largest seismic energy during this #Agung crisis has occurred. Currently, to produce th… https://t.co/YncNZ9YNKi reageer retweet

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Vliegveld van Bali dag langer dicht door vulkaanuitbarsting

Het vliegveld van Bali blijft nog 24 uur langer gesloten. Dat betekent dat er tot woensdagochtend 7.00 uur (lokale tijd) geen vluchten van en naar het Indonesische eiland vertrekken. Boosdoener is de as die vrijkomt uit de vulkaan Agung.

Een rapport van de lokale luchtverkeersleiding heeft aangetoond dat 'de routes van de vliegtuigen verstopt zitten met vulkaanas', meldt het ministerie van transport van Indonesiė. Vulkaanas is gevaarlijk, omdat het turbines van straalmotoren kan beschadigen, brandstof- en koelsystemen kan verstoppen en piloten het zicht kan belemmeren.

Het vliegveld van buureiland Lombok is weer geopend, nadat het een dag eerder ook was gesloten als gevolg van de vulkaanuitbarsting.

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Lava floods re-occur in Tukad Esah slopes of Mount Agung on 5/12/2017. People do not approach rain lava floods. Later approach and grab the sand if it is safe and Mount Agung is back to normal. One blessing of the eruption of Mount Agung.

The strength of lava flood floods can wash away large stones so that hit the bridge. The strength of rain lava flood is greater than that of conventional flood waters. Large stones can drift, let alone people who do near the river.

twitter:

Sutopo_BNPB twitterde op dinsdag 05-12-2017 om 09:29:49 Banjir lahar hujan kembali terjadi di Tukad Esah lereng Gunung Agung pada 5/12/2017. Masyarakat jangan mendekati ba… https://t.co/fdLhz1c3sd reageer retweet

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New lava dome groing in crater
At the surface, the explosive activity of the volcano has been declining during the past week and the ash and steam emissions have decreased considerably. Only a weak steam and gas plume has been observed since yesterday from the crater.

However, this apparent calm does not mean at all that the eruption is over. Rather that tts style is changing: it has entered a more effusive stage, with viscous lava accumulating in the summit crater as a new lava dome, which is what volcanologists have recently confirmed.

According to PVMBG, the Center for Volcanology and Mitigation of Geological Hazards, Agung's new lava dome has already grown to approx. 30 million cubic meters of volume, and it is estimated that this corresponds to about 50% of the available magma volume ready to erupt.

The pace of growth has been worryingly fast: within a few days, the total volume of the dome was claimed to have increased by 10 million cubic meters.

Based on such estimates, the eruption could fill the crater (about 900 m wide and 200 m deep and thus has a capacity of 60 million cu meters) within the next 5-10 days only. At that stage, the eruption will become extremely dangerous: when lava starts to spill over the crater, the viscous, blocky lava will likely generate hot avalanches (pyroclastic flows), that can travel for many kilometers at high speed and devastate everything in their path.

However, this scenario will only happen if the supply of magma is large enough and the eruption still continues, something difficult to know. On the other hand, it seems rather likely that the magma supply is far from being exhausted at the moment: tremor episodes related to magma flowing upwards inside the conduit continue to occur, and ground deformation measurements indicate continuing inflation of the edifice, both indications that more magma is going to be erupted.

PVMBG plans to monitor the crater visually by a drone, but has been facing technical difficulties.

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Bali volcano update: Mount Agung erupts and sends huge plume of ash into sky over Bali
BALI’s highest volcano erupted again today and sent a huge plume of ash 2,500m into the sky as a reminder that the danger has not yet passed.

Mount Agung was pictured sending up a billowing ash cloud in Bali earlier after a period of relative calm and only intermittent eruptions.

The Bali volcano erupted at 5.54pm local time on the holiday island, according to Indonesia’s National Agency for Disaster Management (BNPB).

BNPB spokesman Sutopo Purwo Nugroho said ash rained down on villages of Kubu and Tulamben near popular dive sites with impressive reef.

But he confirmed that the airport is operating normally and the ash cloud had not led to the delay or cancellation of flights.

Frances Boreham, a PhD student at University of Bristol studying lava-water interactions, retweeted a photograph of ash cloud shared by Sutopo.

She tweeted: “Ash plume from an eruption at Mount #Agung in #Bali earlier today.

“A reminder to respect the exclusion zone around the volcano - it's still very active and dangerous!”

11/1/2018 - Mt Agung Erupted

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Volcano erupts after alert level lowered in popular honeymoon island Bali

A volcano on the Indonesian resort island of Bali erupted on Tuesday, days after authorities lowered its alert level one notch, an official said.

Mount Agung spewed gray ash 1,500 meters into the atmosphere, said Sutopo Nugroho, spokesman for the National Disaster Management Agency.

There were no casualties, he said.

On Saturday, authorities lowered the volcano's warning level one notch from the highest level after a steady decrease in activity.

The exclusion zone was reduced from 6 kilometers to 4 kilometers, allowing thousands of people who had stayed in temporary shelters to return home.

But about 15,000 evacuees remained in the shelters, too afraid to return to their homes near the volcano, Sutopo said.

Mount Agung erupts on Feb 13, 2018

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New eruption from Agung

Several eruptions were registered at Indonesia's Mount Agung volcano in Bali on June 27 and 28, 2018. The eruptions produced a dense ash plume that rose up to 5 km above sea level and forced AirAsia to cancel numerous flights on June 28. Officials in Ngurah Rai International Airport are still assessing whether to halt operations again.

Agung erupted on Thursday, June 28, 2018, producing a dense white and black volcanic ash plume that rose up to 1.5 to 2 km (5 000 - 6 500 feet) above crater summit. This is up to 5 km (16 404 feet) above sea level.

Ashfall was reported in nearby communities.

At least 27 AirAsia flights scheduled to arrive to and to depart from I Gusti Ngurah Rai International Airport (DPS), Denpasar have been canceled or postponed and the company urged all guests to update their contact details at airasia.com to ensure that they are notified of any updates to their flights.

Ngurah Rai officials are assessing whether to temporarily halt operations following Mount Agung’s latest eruption, their spokesperson said.

While flights on other airlines are currently all on schedule, anyone flying to our out of Bali is urged to contact their airline.

The Alert Level remains at 3 (on a scale of 1 - 4) and the 4-km-radius (2.5 miles) exclusion zone remains in effect.

Authorities are urging residents living close to the volcano as well as tourists to respect the exclusion zone.