How much energy does it take to Sink an Island?

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Discussion Overview

The discussion revolves around the hypothetical question of how much energy would be required to sink an island the size of Palau (191 square miles). Participants explore the concept of energy in relation to volcanic eruptions and the destruction of islands, questioning the feasibility of such an event and the calculations involved.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the premise by stating that islands are not floating on water, suggesting a need to reframe the question to how much energy it would take to destroy an island.
  • Another participant references the historical eruption of Krakatoa, noting that it released an estimated energy of 8×10^17 Joules, comparing it to the yield of the Tsar Bomb.
  • A different participant argues that sinking an island would require driving it into the Earth's crust, implying that this process would take millions of years.
  • There is a suggestion that the thread may be more appropriate for the Earth sciences section of the forum.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of sinking an island and the nature of the energy required, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Participants have not reached consensus on the definitions and assumptions regarding the concept of "sinking" an island, nor on the calculations of energy involved in such a scenario.

promeus
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Lets say that this is hypothetically possible;How much energy would be required to sink an Island the size of Palau(191 square miles)?

Could this be calculated in Joules?

What if a volcanic eruption was capable of doing this how much energy would it take to sink an Island of this size.
 
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promeus said:
Lets say that this is hypothetically possible;How much energy would be required to sink an Island the size of Palau(191 square miles)?

Could this be calculated in Joules?

What if a volcanic eruption was capable of doing this how much energy would it take to sink an Island of this size.

Islands aren't floating on water...
 
berkeman said:
Islands aren't floating on water...

so true!

it would be more correct in saying ... how much energy it takes to destroy an island

you need to look no further than the once existing island of Krakatoa in the Sunda Strait between Java and Sumatera, Indonesia. In 1883 the eruption of the volcano pretty much totally destroyed the island leaving a huge undersea cauldera. Volcanic rebuilding had continued and now we have Anak Krakatau or son (child) of Krakatoa. Its also quite a violent volcano.
The 1883 eruption was huge some 20+ cubic km of material was ejected and the booms of the explosion were heard over 3000km away.

OK after some amount of link following, I found this in wiki...
8×10^17 J = estimated energy released by the eruption of the Indonesian volcano, Krakatoa, in 1883
and to put that into perspective...
2.1×10^17 J = yield of the Tsar Bomb, the largest nuclear weapon ever tested (50 megatons)this guy wrote a good book on the eruption, I read it some years back
not only did he look at the volcano itself but took it into historical context with the local population etc.

Winchester, Simon (2003). Krakatoa: The Day the World Exploded: August 27, 1883. New York: HarperCollins. ISBN 0-06-621285-5.


there are many other references on the www, and surely some one has written about the equivalent amounts of energy released say compared to large nuclear bombs etc

cheers
Dave
 
Last edited:
promeus, you'll have to be more clear. You can't sink an island, unless you literally want to drive it into the Earth's crust. You'd need a few million years. (Mountains sink, but it takes long time).
 
this thread almost belongs in the Earth section of the other sciences forum.

D
 

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