Question about Volcanoes.?

Question

I have a sci project and would like some help.

1) What were some major volcanic eruptions between 1980 and now?

2) where were they located?

3) how active must a volcano become to be recognized as a huge threat or natural disaster?

Thanks guys!

Answer 1

well the Mt St Helens (Washington state) and Mt Pinatibu (philippeans) are probalby the biggest ones with the latter being larger. There of course have been other ones like that on Monserrat (carrebean), Mt Etna (Italy).
Here in New Zealand we have had a couple of rumbles with Mt Ruapehu in 1995 and 1996.
These are all located near the edge of tectonic plates. Hawaii is an example of a hot spot and different to these major eruption.
volcanoes have ratings for activity and I remember them talking about level 4 and 5 for Mt Ruapehu as an imminent eruption...the higher the rating the more chance of eruption.
Its not only the eruption but how violent it is, the type of volcano (which can put out lava but not much else, or lots of ash, pyroclastic flows, lahars) and how many people it affects.
When people live on or close by to a volcano there is more chance it will be seen as a larger problem as more people will be affected when it erupts....

Answer 2

To add to the other answer: It's not a question of activity that makes it a threat. Mt. Saint Helen's had been dormant for 400 years before 1980's eruption. It was not considered a huge threat but when it blew it surely was a natural disaster. Obviously volcanoes that show a lot of little activity are watched more closely but sometimes the quiet ones are ignored and big, bad things happen.

Answer 3

i'm uncertain approximately Penrith, yet i comprehend for particular that there are volcanoes in Australia. all of them have stopped functioning million of years in the past nonetheless. i've got traveled by using the state of victoria and have considered some. In Koroit, a small city close to the excellent ocean highway, there is super extinct volcano, that's now a nature reserve. interior the Camperdown area, volcanoes can be discovered. The close by Mt Leura is fairly climbed and has stable perspectives from it is top. playstation - Oops, so it form of feels i became right into slightly it incorrect with regard to the "million" difficulty. besides, they are easily previous and are exciting to flow to..

Answer 4

Mount St. Helens- Washington State
Pinatubo-Not sure, possibly philippeans. It is in pacific islands.

In order for an eruption to be considered a "disaster"
There need to be casualties or damage to area surroundind the volcano.

Answer 5

In reference to question 2. Take a look at plate techtonics. They often occur at plate boundaries as it is the constructive margin that forces the magma up, that then cools and over a long period of time becomes a volcano.