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THE Volcano Thread Pt. 2

Re: THE Volcano Thread Pt. 2

Unread postby rockdoc123 » Sun 15 Apr 2018, 17:12:00

The actual mechanisms are still debated somewhat but most believe circulation in the mantle coupled with density spreading of new oceanic crust from the higher ridges towards the subduction zones is the main culprit. The subducted slab is melted and contributes to volcanoes through uprising magma, the majority being assimilated into the mantle and redistributed at the ocean ridges.
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Re: THE Volcano Thread Pt. 2

Unread postby ROCKMAN » Mon 16 Apr 2018, 10:28:05

Donlan - All good questions. But I doubt those dynamics can be measured in the span of a human lifetime. And worse: I doubt anyone is making much effort to measure "the big picture".
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Re: THE Volcano Thread Pt. 2

Unread postby dohboi » Wed 25 Apr 2018, 10:03:24

Ambae, one of the islands of the Vanuatu archipelago, has a volcano- Monaro- that has always been active but is now destroying the habitat.

https://www.theguardian.com/world/2018/ ... t-on-ambae


A landslide and flash flood on the Vanuatu island of Ambae is complicating evacuation efforts, with as many as 800 people now sheltering in emergency relief centres.

Ambae Island is home to 11,000 people, and for the second time in six months Manaro volcano on top of Mount Lombenben has started rumbling, spewing torrents of ash, gas and rocks from its crater. The debris is causing breathing and health problems, and threatening livelihoods by burying vegetable plots and crops.

The government has declared a three-month state of emergency while it works with non-governmental organisations to safely evacuate the island and secure new homes for displaced islanders who may never be able to return.

Acting prime minister Jean Pierre Nirua said Vanuatu was the most vulnerable country in the world to natural disasters, and was currently stretched by responding to the clean-up of last month’s cyclone Hola and the unfolding Ambae emergency.

According to the Vanuatu meteorology and geohazards department the volcano remains at level three, with a danger zone surrounding the cone of three kilometres.

Due to eruption activity the cone of the volcano had widened, resulting in ash fall, gas, and acid rain, as well as a heightened risk of landslides and flash floods.
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Re: THE Volcano Thread Pt. 2

Unread postby Plantagenet » Wed 25 Apr 2018, 23:45:01

Small eruptions continuing on Sentaru Volcano here on Java

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"Its a brave new world"
---President Obama, 4/25/16
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