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On August 27, 1883, the Krakatoa volcano, west of Java in Indonesia, erupted with a force of 1,300 megatons and killed approximately 40,000 people. From the article:
"Krakatoa Eruption
Around 1 p.m. on August 26, a volcanic blast sent a cloud of gas and debris some 15 miles into the air above Perboewatan.
It would be the first in a series of increasingly powerful explosions over the next 21 hours, culminating in a gigantic blast around 10 am on August 27 that propelled ash some 50 miles into the air and could be heard as far away as Perth, Australia (a distance of some 2,800 miles).
About 9 square miles of the island, including both Perboewatan and Danan, plunged underwater into the caldera to a depth of some 820 feet below sea level.
Krakatoa’s violent eruption killed more than 36,000 people. Relatively few of the victims were killed by the tephra (volcanic rock) and hot volcanic gases produced by the blasts themselves.
But tens of thousands more people drowned in the series of tsunamis caused by the volcano’s collapse into the caldera, including a 120-foot-high wall of water that formed just after the climactic blast and wiped out 165 coastal villages on Java and Sumatra.
As evidence of the tsunami’s devastating power, water deposited the steamship Berouw nearly a mile inland on Sumatra, killing all its crew members.
What Caused the Eruption?
Like all volcanic eruptions, Krakatoa’s can be traced to the movement of the tectonic plates that make up the Earth’s crust, which are constantly moving against each other over the thick liquid layer, or mantle, beneath.
Indonesia is located at the heart of a so-called subduction zone, where the Indo-Australian Plate collides with part of the Asian Plate (Sumatra) as it moves northward.
As a heavier oceanic plate, the Indo-Australian slides underneath the lighter, thicker continental plate (Sumatra), and the rock and other materials that slide with it heat up as it dives below the Earth’s surface. Molten rock (or magma) from below rushes upward through this channel, forming a volcano.
In 1883, each of the three distinct peaks of Krakatoa served as an exit route for the enormous magma chamber deep below it. Analysis suggests that during an earlier eruption, debris clogged the neck of Perboewatan, and pressure then built up below the blockage.
After the initial explosion split the magma chamber, and the volcano began to collapse, seawater came into contact with the hot lava, creating a cushion of explosively hot steam that carried the lava flows up to 25 miles at speeds of up to 62 mph.
Global Impact of Krakatoa
The 1883 Krakatoa eruption measured a 6 on the Volcanic Explosivity Index (VEI), with a force of 200 megatons of TNT. By comparison, the bomb that destroyed the Japanese city of Hiroshima in 1945 had a force of 20 kilotons, or nearly 10,000 times less power.
Krakatoa’s eruption sent six cubic miles of rock, ash, dust and debris into the atmosphere, darkening the skies and producing vividly colored sunsets and other spectacular effects around the world.
Writing from England, poet Gerard Manley Hopkins described skies of green, blue, gold and purple, “… more like inflamed flesh than the lucid reds of ordinary sunsets … the glow is intense; that is what strikes everyone; it has prolonged the daylight, and optically changed the season; it bathes the whole sky, it is mistaken for the reflection of a great fire.”
Dense clouds immediately lowered temperatures in the immediate area. As the dust spread, according to later studies, the eruption likely caused a drop in average global temperatures for several years.
Other climatic changes occurred thousands of miles from Indonesia: The amount of rainfall in Los Angeles – 38.18 inches – in the months following the Krakatoa eruption remains the city’s highest annual rainfall on record.
Though Krakatoa’s is far from the most powerful volcanic eruption in history (the eruption of nearby Tambora in 1815, for example, measured a 7 on the VEI), it’s arguably the most famous. Its 1883 eruption became the first truly global catastrophe, thanks to the recently installed worldwide telegraphic network, which instantly broadcast news of the eruption all over the world."
"Krakatoa Eruption
Around 1 p.m. on August 26, a volcanic blast sent a cloud of gas and debris some 15 miles into the air above Perboewatan.
It would be the first in a series of increasingly powerful explosions over the next 21 hours, culminating in a gigantic blast around 10 am on August 27 that propelled ash some 50 miles into the air and could be heard as far away as Perth, Australia (a distance of some 2,800 miles).
About 9 square miles of the island, including both Perboewatan and Danan, plunged underwater into the caldera to a depth of some 820 feet below sea level.
Krakatoa’s violent eruption killed more than 36,000 people. Relatively few of the victims were killed by the tephra (volcanic rock) and hot volcanic gases produced by the blasts themselves.
But tens of thousands more people drowned in the series of tsunamis caused by the volcano’s collapse into the caldera, including a 120-foot-high wall of water that formed just after the climactic blast and wiped out 165 coastal villages on Java and Sumatra.
As evidence of the tsunami’s devastating power, water deposited the steamship Berouw nearly a mile inland on Sumatra, killing all its crew members.
What Caused the Eruption?
Like all volcanic eruptions, Krakatoa’s can be traced to the movement of the tectonic plates that make up the Earth’s crust, which are constantly moving against each other over the thick liquid layer, or mantle, beneath.
Indonesia is located at the heart of a so-called subduction zone, where the Indo-Australian Plate collides with part of the Asian Plate (Sumatra) as it moves northward.
As a heavier oceanic plate, the Indo-Australian slides underneath the lighter, thicker continental plate (Sumatra), and the rock and other materials that slide with it heat up as it dives below the Earth’s surface. Molten rock (or magma) from below rushes upward through this channel, forming a volcano.
In 1883, each of the three distinct peaks of Krakatoa served as an exit route for the enormous magma chamber deep below it. Analysis suggests that during an earlier eruption, debris clogged the neck of Perboewatan, and pressure then built up below the blockage.
After the initial explosion split the magma chamber, and the volcano began to collapse, seawater came into contact with the hot lava, creating a cushion of explosively hot steam that carried the lava flows up to 25 miles at speeds of up to 62 mph.
Global Impact of Krakatoa
The 1883 Krakatoa eruption measured a 6 on the Volcanic Explosivity Index (VEI), with a force of 200 megatons of TNT. By comparison, the bomb that destroyed the Japanese city of Hiroshima in 1945 had a force of 20 kilotons, or nearly 10,000 times less power.
Krakatoa’s eruption sent six cubic miles of rock, ash, dust and debris into the atmosphere, darkening the skies and producing vividly colored sunsets and other spectacular effects around the world.
Writing from England, poet Gerard Manley Hopkins described skies of green, blue, gold and purple, “… more like inflamed flesh than the lucid reds of ordinary sunsets … the glow is intense; that is what strikes everyone; it has prolonged the daylight, and optically changed the season; it bathes the whole sky, it is mistaken for the reflection of a great fire.”
Dense clouds immediately lowered temperatures in the immediate area. As the dust spread, according to later studies, the eruption likely caused a drop in average global temperatures for several years.
Other climatic changes occurred thousands of miles from Indonesia: The amount of rainfall in Los Angeles – 38.18 inches – in the months following the Krakatoa eruption remains the city’s highest annual rainfall on record.
Though Krakatoa’s is far from the most powerful volcanic eruption in history (the eruption of nearby Tambora in 1815, for example, measured a 7 on the VEI), it’s arguably the most famous. Its 1883 eruption became the first truly global catastrophe, thanks to the recently installed worldwide telegraphic network, which instantly broadcast news of the eruption all over the world."
Krakatoa
Posted from history.com
Natural Disaster
World History
Science
Geology
Death
Posted 3 y ago
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