Volcanic eruption is one of the most spectacular natural
landscapes on earth but it is a kind of great disaster as well.
Every massive volcanic eruption causes casualties and
at the same time, lots of ash, soot and gas soared up to atmospheric
stratosphere, which makes the climate abnormal and causes a seires of disasters.
The duration of each eruption varies. Some last for several days
or months, some last for several years, decades or even centuries.
According to statistics, there are around 500 active volcanoes
in the world, of which nearly 70 are under water and the rest
are all on land. Almost every year, there are volcanic eruptions
of different sizes and degrees, which bring great harm to human
activities and subsistence.
About a quarter of the world’s population live in dangerous areas
of volcanic activities. According to incomplete statistics,
volcanic eruptions killed about 270,000 people in the last 400 years,
especially in the Pacific Rim, where active volcanoes
are concentrated, volcanic disasters are more abrupt.
Up to now, the most violent volcanic eruption has taken place
in Indonesia and one of the most famous was the eruption of tambora
On April 5th, 1815, the volcano erupted and people winthin 1000 km
heard the blare of volcanic eruptions. Then, huge amount of gas and
ash sprayed out, which lasts more than 3 months and ash swept even
out of 1000 km, and the thickness of accumulation of 2000 meters
is 90 cm, 25000 meters, 25 cm.
When the volcano erupted, a taunami occurred consequently, which sank
the land and the nearby Tambora town to the depths of 6 meters.
The eruption left nearly 100,000 people dead and loss of property
can't be estimated.