Toba Lake |
Location of the largest volcanic
eruptions in the last 25 million years, which almost destroyed the entire human
race began in 1980, Mount St. Helens in Washington spit a plume of smoke 80,000
feet high, people were killed and
57,200 houses destroyed, 27 bridges, 15 miles of track and 185 miles from the
highway. It was deadly and destructive
eruption most economically volcanic history of the United States.
For comparison, the largest
volcanic eruption in recorded historic times, the eruption of Tambora in 1815. He was eighty times more
powerful than Mount St. Helens and spat about 100 km3 of rock and the entire
northern hemisphere is dark and cold for all of 1816, making it the "year
without summer" , as we have known. But compared to the case who
participated in North Sumatra, Indonesia around 73,000 years ago, this was as
good as nothing.
Known as the event they Toba
ejected almost 2800 km3, or 28 times the largest volcanic eruption in
historical memory, and more than two thousand times more powerful than Mount
St. Helens. It was like the Yellowstone
supervolcano "big" sister, and when these mega-colossal volcanic
levels 8 - the highest rating on the volcanic explosivity index - burst was the
largest volcanic eruption in the last 25 million years.
It can have almost destroyed the
human race.
When the volcano, he filed six
meters of ash on parts of Malaysia and a layer 15 cm thick ash on the Indian
subcontinent and acid rain fell for many years. The temperature of the planet
suddenly dropped 3-5 ° C and after a few (from ice cores from Greenland), it
immediately starts the next ice age world.
It turns out that this enormous
environmental disaster with signs of massive decline in human population
results in the collapse of a genetic bottleneck. According to the theory of the
Toba catastrophe, 6 to 10 years of volcanic winter resulting destroyed most of
the vegetation in the area, where people live and may have reduced the
population so few breeding pairs in 1000.
There is some good evidence for
this genetic bottleneck, and many geneticists believe that the evidence that
all living descendants despite their apparent diversity, a very small
population, perhaps between 1000 to 10,000 breeding pairs in about 70,000 years. It is well known that the East
African chimpanzee, orang-utan in Borneo, the Central Indian macaques and
tigers, all recovered from the population bottelnecks about the same time. All this seems to fit perfectly
with the theory super-volcano Toba Toba catastrophe, and the event.
But as it is still science, nothing is pure or simple statements
and contradictory is just as strong. For the conflicting testimony
are similar tools in India below and above the ash layer to live relatively
unchanged, and the fact that non-human hominids such as Homo erectus soloensis,
Homo floresiensis, Homo neanderthalensis, which all came to be adversely affected
by, however, the volcano seems unprecedented disaster proof of genetic
bottlenecks survived.
Whether it is almost annihilated
mankind or not, for all those who were alive 75,000 years the eruption of Toba
must be sure that the end of the world to have taken place.
0 komentar:
Post a Comment