The Great Eruption of Krakatau in 1883 was the biggest explosion sound in the history of mankind

Volcanic island in Indonesia "Krakatau"The large eruption that occurred in 1883 is recorded that the greatest eruption that human beings recorded was the largest eruption. From the meteorological data remaining around the world, we know that explosion sounded 4 times around the earth for 5 days.
The Krakatoa Volcanic Eruption Was So Loud it Was Heard Round the World
http://nautil.us/issue/38/noise/the-sound-so-loud-that-it-circled-the-earth-four-times
Krakatau is located on the sea about 150 km west of Jakarta, Indonesia.
Krakatau is a collective term for volcanic islands where more than one gathered, now consists of four main islands. In the past several islands were connected, but the caldera was formed by the large eruption that has been repeated many times, mostly lost and it is in the present state.

The appearance of Krakataau which raises the smoke still now. It is also a volcanic island whose name is left in history for a long time, and in 1771 and 1777 it was a British marine explorerCaptain CookIt is recorded that the island was also visited.

ByFlydime
It was August 27, 1883 that such Krakatau caused "the greatest eruption in history". At 10:02 am local time, Krakatau caused a big explosion. The rumble is tremendous, there are residents 'records of Indian Andaman archipelago, about 2,100 km northwest, where residents' records seemed to have fired guns as they heard a tremendous sound, and Papua New Guinea 3200 km east "I heard multiple sounds like a cannon from the direction of the northwest" and the record that it is no longer close to Africa 4800 km awayRodrigues IslandBut it was enough that there was a record that "I could hear a long-shot like a firearm from the direction of the east". Together with all the records, it is recorded that the explosion sound of Krakatau was heard at 50 places all over the world, and that range extends to 13% of the whole earth.
When shown on the map, the area where the explosion sound was actually heard is as follows. If this is compared in Japan, it is impossible to imagine that the sound emitted in Hokkaido goes far beyond Okinawa, surpasses Taiwan and Hong Kong and can survive around Vietnam with enough time to release an extremely large amount of energy .

Actually the power of the explosion was tremendous, it was such a big explosion that the bulk of the volcanic island of Krakatau that was large was blown away. It was recorded in the record that the explosion occurred sporadically from May 1883, the first explosion occurred on May 20. Thereafter the eruption continued, repeating the earthquake, the eruption occurred on three volcanoes on August 11, and eventually the large eruption of the century occurred on August 27. It is thought that the plume has reached the altitude of 27,000 meters and the boulders are emitted from the crater at twice the speed of sound.

This large eruption caused a huge tsunami of 30 meters in height, and 165 villages located in the surrounding islands completely disappeared. Although the number of dead people is seen as 36,417 people, there is also a survey result that total is 120,000 people. The eruption arrived at the British battle ship "Norman Castle" which was about 64 km off the island at the time of eruption, and the captain has reached the logbook in the navigator's journal "Half of the crew suffered damage that can cause the eardrum to break. I thought of my wife, I finally thought that the day of the judgment went wrong. "
Shock waves generated by this eruption are left as atmospheric pressure observation data. It was attached to gas tank in Jakarta cityMercury barometerIt is recorded that the graduation of mercury rose by about 6.4 cm due to rise in atmospheric pressure. When this is replaced with a unit of sound pressure,172 dBIt will be a tremendous thing. To give an example to show how far this figure is, the noise of the rock breaking excavator is said to be 100 decibels, the noise the human being feels pain is 130 decibels. It is 150 decibels right beside the engine of a jet throttle full throttle state, which can not tolerate very well, but it was recorded that the shock waves caused by the eruption were far more than those It is.
A famous movie that captured the state of the shock wave caused by volcanic eruption is kore. At the same time as the plume, a state like a white cloud diffuses around, but this is the movement of the shock wave caused by the explosion. In addition, it shows how the explosion sound reached after a few seconds from the eruption, this is the timing when the shock wave arrived.
Volcano Eruption in Papua New Guinea - YouTube
The blast from the eruption spread to the whole earth as a shock wave. Meteorological observations have already been conducted mainly in Europe and the United States at that time, and an increase in atmospheric pressure was observed at Kolkata (Calcutta) in India 6 hours and 47 minutes after the eruption. Even then, after 8 hours, it was observed in the Mauritius Islands, Melbourne and Sydney, and after 12 hours the pressure also rises in St. Petersburg, Vienna, Rome, Paris, Berlin and so on. After 18 hours I reached New York and Washington DC, and after that there was a rise in atmospheric pressure in each region every 34 hours thereafter. This indicates that the shock wave has run around the earth with the speed of the sound. The pressure rise eventually observed was 3 to 4 times in each region. There seemed to be a place where the phenomenon was confirmed seven times in some cases.
In addition, non-fiction works over this large eruption have also been announced. Journalist'sSimon WinchesterIn his book "Krakatoa's Great Eruption" written by Mr. Kurakatoa, not only the direct damage caused by the eruption but also the explosion of Krakatoa Island, which became a turning point for changes in politics and economy, development of science, etc., with the political situation at the time Also drawn together.
Krakatoa's Great Eruption | Simon Winchester, Shibata Hiroyuki | Books | Amazon.co.uk

Krakatoa Volcano ... Located between Java Island and Sumatra Island, this volcano, on August 27, 1883, caused the greatest explosion in history, causing extensive damage to the world. Due to the tsunami as high as 30 meters, more than 36,000 people died and many ships were capsized, sunk, collapsed.
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The Krakatoa explosion became the first natural disaster reported worldwide by telegraphic technology using submarine cable developed during the colonial era. By doing so, people around the world have come to know the reasons such as extraordinary weather that is occurring in the immediate vicinity.
In addition, the long-term weather inadequate caused by the volcanic explosion and the poor quality of agricultural crop caused dissatisfaction with the rule of the Dutch, an Islamic fundamentalist uprising occurred in various places, loosening the colonial regime.
The dust in the air caused by Krakatoa also changed the sunset glow of Europe into a seven color. Many artists are inspired by this sky, leaving many colorful works.
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