Actividade Vulcânica 2017

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luismeteo3

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A 4.3 earthquake was recorded in Bali on Wednesday afternoon.

Striking around 1:12pm, the quake’s epicenter was northwest of Karangasem, at a depth of eight kilometers, according to the regional disaster mitigation agency, BPBD Denpasar.


This is the largest earthquake on record so far in the area since the volcano’s alert status was upgraded to a level IV on Friday.

Mt. Agung, which is located in Karangasem, has been rumbling for the past month and an eruption is feared to happen shortly. The volcano is currently on the highest alert level and an exclusion zone of nine kilometers as been set from the crater.

A 4.2 earthquake hit around the same area yesterday afternoon, which could be (though we don’t yet know for sure) connected with the magma that is pushing its way up within Mt. Agung, said Volcanology and Geological Hazard Mitigation Center (PVMBG) director, Kasbani.
https://coconuts.co/bali/news/bali-hit-4-3-earthquake-near-mt-agung-volcano/
 
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criz0r

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@luismeteo3, @criz0r, @Felipe Freitas, na vossa opinião há possibilidade de uma erupção com VEI igual ou superior a 5??? É que, na teoria, a frequência de uma VEI5 está ultrapassada e passaram pouco mais de 25 anos após a última VEI6 Pinatubo (1991).
Uma VEI7 é totalmente de excluir??

Boas Miguel,

Como referiu e bem o colega @fablept, a possibilidade de uma Erupção VEI5 é sempre algo em cima da mesa até pelo histórico mais recente deste Vulcão que tanto em 1964 como em 1843 ocorreram Erupções a essa escala. Uma Erupção, numa escala superior a essa sinceramente não creio embora a Natureza nos pregue umas partidas de vez em quando.

lGGZB1H.jpg


Fica a questão no que diz respeito ao impacto que poderá ter no clima, sendo um Estratovulcão com erupções do tipo explosivo, tudo vai depender da quantidade de cinza e material piroclástico projectados na atmosfera. A ultima Erupção diga-se de passagem foi bem violenta.

1963 Eruption
A destructive eruption occurred in 1963. Victims were killed by pyroclastic flow (820 persons), ejected glowing rock fragments and volcanic ashfalls (163 persons), and 165 persons were killed by lahars. Injured people were affected by pyroclastic flows (59 persons), ejected glowing rock fragments and volcanic ashfalls (210 persons), and lahars (36 persons).

The first indication of renewed activity were frequent tremors felt by people living in Jehkori, a village on the southern slope of the volcano at an elevation of 928 m, about 6 km from the summit.

Five days after resumption of activity, thick and viscous lava flowed over the lowest northern crater rim and down the steep northern slope. It reached a length of 7 km from the summit towards the middle of March 1963.

On 24th February, nuees ardentes killed 12 people in the village of Boleng who were evacuees returning for their belongings.

The eruption reached its highest peak of intensity at 05:32 on 17th March 1963 with eruption clouds rising to a height of 10 km from the crater. Nuees ardentes flowed down the southern and southeastern slopes continuously and devastated numerous villages and temples in the region around Selat. The nuees ardentes
reached distances of 14 km from the summit and burned everything on their way.

Another series of large eruptions occurred on 16th May 1963 when ash was emitted to a height of 10 km and nuee ardentes killed 120 people.

The eruptions of Agung volcano in 1963 created a crimson sunset glow over America and Europe.

https://volcano.si.edu/volcano.cfm?vn=264020
http://www.volcanolive.com/agung.html
 

Dias Miguel

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possibilidade de uma Erupção VEI5 é sempre algo em cima da mesa até pelo histórico mais recente deste Vulcão

Então podemos esperar um evento vulcânico único em décadas. Obrigado @criz0r
Outra questão: creio ter ouvido ou lido que, no caso de uma erupção explosiva, chega a existir uma "dilatação" do vulcão, parecendo que o mesmo aumenta de tamanho. Para além da sismografia, pode ser esta análise uma forma de antever a erupção deste vulcão?
Pelo que já reparei, uma VEI5 poderá destruir uma vasta área da ilha de Bali, para além da chuva de cinzas nas regiões próximas e de consequências em quase todo o mundo. Se for uma VEI6 podemos inclusive viver um "Inverno Vulcânico"... :intrigante:
 
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criz0r

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Outra questão: creio ter ouvido ou lido que, no caso de uma erupção explosiva, chega a existir uma "dilatação" do vulcão, parecendo que o mesmo aumenta de tamanho.

Neste caso, não sei se foi registada dilatação do solo perto do Vulcão mas se for esse o caso é porque a pressão dentro da câmara magmática deve ser exponencial. Como não se têm verificado quaisquer aberturas para uma erupção fissural ou qualquer outra libertação maior de gases vulcânicos para aliviar esta pressão, se existir uma Erupção penso que seja efectivamente algo violenta. Foram registados nas ultimas 24h, cerca de 800 sismos o que por si só deixa antever um cenário de explosividade.
As consequências de uma erupção do Agung, dependendo da magnitude da explosão (se ocorrer) poderão ser trágicas na Ilha. O tráfego aéreo naquela região será certamente muito afectado e na ocorrência de precipitação será sempre ácida. O Katla na Islândia também tem registos de Erupções VEI5 embora a ultima erupção tenha sido sub-glacial mas o suficiente para ter originado enormes cheias devido ao degelo.

2.40pm: Mount Agung eruption ‘will be disruptive’

Dr Teresa Ubide, a volcanologist from Queensland University says that Mount Agung “is a volcano that can erupt explosively” and warned that the next eruption could cause damages.

She told Australia’s ABC News: “According to past activity on this particular volcano the eruption can get to be quite explosive. For example in the last eruption in 1963 the explosivity was high, the ash column reached 20km, and the death toll was also high.

“So it is a volcano that can erupt explosively, and this time the pressure in the magma could build up and we may have an explosive eruption which may cause damages to air traffic and the surrounding area – this is why it’s been evacuated.

The number of people who have fled the area around Mount Agung has increased to 96,000, Indonesia's National Disaster Mitigation Agency has said.

It added that a monitoring centre has recorded more than 800 earthquakes today and that smoke has been observed rising 50m above the crater.

http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 

luismeteo3

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3.15pm: Nearly 100,000 forced to flee their homes from the deadly volcano

Indonesian authorities have confirmed that over 96,000 people have now fled the areas surrounding Mount Agung.

The National Disaster Mitigation Agency said that it has observed 800 tremors so far and and a thin cloud of smoke is rising 50 metres above the volcano’s crater.

Agency spokesman Sutopo Purwo Nugroho said that the chances of an eruption at this stage are “quite big”, though a timeframe cannot be specified.

3pm: Sebastian Kettley taking over live reporting from Reiss Smith

Bali-volcano-mount-agung-1078450.jpg
NC

http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 

luismeteo3

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6.00pm: Over 800 earthquakes rock Bali as magma approaches the surface

The latest update from Indonesia’s National Board for Disaster Management, said that over 800 tremors were detected today.

Sutopo Purwo Nugroho, Head of Information Data and Public Relations Center of BNPB, said in the update: “Mount Agung volcanic activity in Bali is still high.

“Today there were 329 times shallow volcanic earthquakes, 444 deep volcanic earthquake, and 56 local tectonic earthquake. The number and strength of the quakes was bigger than yesterday.

“Magma movement approaching the surface continues."

Officials have also installed five sirens to want residents of an impeding eruption.
http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 
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luismeteo3

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8.08pm: Warning signs placed around evacuation zone

Indonesian officials have erected warning signs around Mount Agung’s “danger zone”, according to volcanologist Dr Janine Krippner

The signs read: "You are currently at a radius of 9km from the summit crater of Mount Agung”.

8pm: Joe Tambini taking over live reporting from Sebastian Kettley

7.02pm: White smoke spotted rising from Mount Agung crater as chances fo eruption "quite large"

A notice issued by Indonesia’s National Board for Disaster Management, said that plumes of white smoke are escaping the volcano’s crater.

The warning said: “There was white smoke observed some 50m above of peak of the crater.

“The chances of the eruption are quite large. But it can not be ascertained when it will erupt with certainty.

“There are nearly 100,000 people evacuated.”

The disaster management agency also expects the number of refugees to increase as people outside of evacuations zones are also moving to safety.
http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 
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luismeteo3

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3.52pm: Mount Agung enters ‘critical phase’ and could be ‘minutes away’ from erupting

BBC reporter Hywel Griffith warned that the cataclysmic disaster could be “minutes away”, according to the latest data on Mount Agung.

Speaking from a beach in Bali, Mr Griffith said: "The earthquakes continue coming, the seismic activity is still very frequent. An eruption could be minutes or hours, days or maybe even months away.

"Life on Bali’s tourist beaches is continuing more or less as normal. That’s exactly what the Indonesian Government is hoping for.

“It sent out a letter addressed to ‘the people of the world’, talking about the fact that Bali is still open for business. Even if there is an eruption they have contingency plans."

3.30pm: More than 130,000 now displaced by the volcano threat

Bali officials from the Disaster Mitigation Agency have estimated that the number of evacuees on Bali have swelled to around 134,200 refugees.

The incredible figure is more than double the number of initially estimated population in the danger zone.

The refugees are cantered across more than 500 makeshift evacuation camps and designate buildings.
http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 
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luismeteo3

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Vulcão Monaro Voui força evacuação “sem precedentes” de ilha no Pacífico
28.09.2017 às 9h37

mw-860

SOCIAL MEDIA

Os 11 mil residentes de Ambae, do arquipélago de Vanuatu, estão a ser retirados para outras ilhas por causa da erupção vulcânica. Operação deverá estar concluída na sexta-feira

JOANA AZEVEDO VIANA


As autoridades de Vanuatu ordenaram esta quinta-feira a evacuação "total e obrigatória" de Ambae, uma das ilhas do arquipélago, onde foi declarado o estado de emergência devido à erupção do vulcão Manaro Voui, informaram os meios de comunicação locais.

“A vida das pessoas de Ambae é a nossa prioridade”, disse o primeiro-ministro do arquipélago do Pacífico Sul, Charlot Salwai, ao ordenar a evacuação "sem precedentes" daquela ilha. Existem cerca de 11 mil residentes em Ambae, seis mil dos quais já tinham sido retirados das suas casas no fim-de-semana face à "erupção moderada" do vulcão. Perante os riscos associados à crescente atividade vulcânia, hoje as autoridades ordenaram a total evacuação da ilha pela primeira vez na história de Vanuatu, uma operação que deverá estar concluída na próxima sexta-feira.

O vulcão, cujo alerta foi fixado na categoria 4 numa escala de 5, está a expelir rochas, gás vulcânico, chuva ácida e cinzas em Ambae, informou o Departamento de Perigos Geológicos do país. "Já retirámos as pessoas das zonas mais elevadas para áreas mais seguras no oeste e no leste da ilha", explicou à AFP Shadrack Welegtabit, diretor da Agência de Gestão de Desastres de Vanuatu, avançando que o alerta poderá ser elevado para o nível mais alto.

Segundo o responsável, há grandes probabilidades de haver uma "erupção total", razão pela qual "temos agora de retirar todas as pessoas da ilha". A Rádio Nova Zelândia aponta que a maioria delas será realojada temporariamente na ilha de Pentecoste, a mais próxima de Ambae.
http://expresso.sapo.pt/internacion...evacuacao-sem-precedentes-de-ilha-no-Pacifico
 
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luismeteo3

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9.45pm: Steam vapour is now visible above Bali’s Mount Agung volcano.

The appearance of steam indicates that the mountain is heating up, increasing fears that it could erupt at any moment.

The threat of an impending eruption has had a severe impact on the country’s tourism. The town of Amed, in the north-east of the island is usually full of tourists on diving holidays but is not deserted.

Ni Made Febriana, 13, told ABC: I’m not happy. It's not fun, there are no tourists … they are afraid of earthquakes, and they have evacuated to some places with their friends."
http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 
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luismeteo3

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karen- @wx_k 39 minHá 39 minutos
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Mount Agung volcano: Satellite image reveals new crack in crater

10.35: Bali volcano steaming ‘like factory chimney’.

Steam continues to rise out of Mount Agung ahead of a probable eruption.

“This morning, steam came out of the crater like smoke from a factory chimney”, said volcanologist Gede Suadikan.

He added that the sulphuric acid vapour coming out of the volcano is thicker now than at the start of the month, showing that the situation inside is changing.

9.30am: Bali residents recall 1963 eruption

Two men who survived the 1963 Mount Agung eruption have shared their past experiences.

One said that he is “scared” of another eruption, and recalled how he used a bucket to cover his head from the rocks that fell from the sky.

Another was nonplussed by the volcano. He said that last time it blew, “there was a huge cloud above the mountain and then that cloud fell to the earth in lumps”.

“I remember pointing to the cloud and asking my father what it was,” he told the BBC. “I thought it was a bear, my father said it was a storm.”

8.30am: Thousands of tremors felt in Bali

A new graph released by MAGAM Indonesia shows the thousands of tremors felt around Mount Agung.

There have been more than 650 instances of seismic activity recorded each day since last Thursday, September 21. On some days there have been almost 1,000 tremors.
http://www.express.co.uk/news/world...latest-seismic-graphs-news-maps-warnings-live
 
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