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P1254325860elpwr

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Krakatoa erupted in 1883 4 times in two days ,once on the 26th of October at 17: ... 6. Every recording barograph in the world documented the passage of the airwave, ... – PowerPoint PPT presentation

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Title: P1254325860elpwr


1
krakatoa
the dark mountian
2
Where is krakatoa
  • Unlike what the film says krakatoa is actually to
    the west of Java and southwest of Sumatra. It is
    part of Indonesia

This is modern day krakatoa
3
When did it erupt
  • Krakatoa erupted in 1883 4 times in two days
    ,once on the 26th of October at 1707,and three
    times on the 27th at 0530, 0644 and 1002.

4
What damage did it do
Anak krakatoa was created by the explosions. It
is in the middle of the island which was partly
destroyed
The fourth explosion caused a giant tsunami
(bigger than those created by the other three)
which destroyed many coastal towns in the Saundra
strait . The Tsunami managed to cause small sea
level oscillations as far as the English channel
5
  • 1. The explosions were heard on Rodriguez
    Island, 4653 km distant across the Indian Ocean,
    and over 1/13th of the earth's surface.
  • 2. Ash fell on Singapore 840 km to the N, Cocos
    (Keeling) Island 1155 km to the SW, and ships as
    far as 6076 km WNW. Darkness covered the Sundra
    Straits from 11 a.m. on the 27th until dawn the
    next day.
  • 3. Giant waves reached heights of 40 m above sea
    level, devastating everything in their path and
    hurling ashore coral blocks weighing as much as
    600 tons.
  • 4. At least 36,417 people were killed, most by
    the giant sea waves, and 165 coastal villages
    were destroyed.
  • 5. When the eruption ended only 1/3 of Krakatau,
    formerly 5x9 km, remained above sea level, and
    new islands of steaming pumice and ash lay to the
    north where the sea had been 36 m deep.

6
  • 6. Every recording barograph in the world
    documented the passage of the airwave, some as
    many as 7 times as the wave bounced back and
    forth between the eruption site and its antipodes
    for 5 days after the explosion.
  • 7. Tide gauges also recorded the sea wave's
    passage far from Krakatau. The wave "reached Aden
    in 12 hours, a distance of 3800 nautical miles,
    usually traversed by a good steamer in 12 days".
  • 8. Blue and green suns were observed as fine ash
    and aerosol, erupted perhaps 50 km into the
    stratosphere, circled the equator in 13 days.

7
  • 9. Three months after the eruption these products
    had spread to higher latitudes causing such vivid
    red sunset afterglows that fire engines were
    called out in New York, Poughkeepsie, and New
    Haven to quench the apparent conflagration.
    Unusual sunsets continued for 3 years.
  • 10. Rafts of floating pumice-locally thick enough
    to support men, trees, and no doubt other
    biological passengers-crossed the Indian Ocean in
    10 months. Others reached Melanesia, and were
    still afloat two years after the eruption.
  • 11. The volcanic dust veil that created such
    spectacular atmospheric effects also acted as a
    solar radiation filter, lowering global
    temperatures as much as 1.2 degree C in the year
    after the eruption. Temperatures did not return
    to normal until 1888.
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