{"id":2526,"date":"2018-08-28T11:06:24","date_gmt":"2018-08-28T09:06:24","guid":{"rendered":"https:\/\/hesmid.nl\/test\/?p=2526"},"modified":"2018-08-28T11:07:40","modified_gmt":"2018-08-28T09:07:40","slug":"1883-eruption-of-krakatoa","status":"publish","type":"post","link":"https:\/\/hesmid.nl\/test\/1883-eruption-of-krakatoa\/","title":{"rendered":"1883 eruption of Krakatoa"},"content":{"rendered":"\n

wiki link<\/a><\/p>\n\n\n\n

The\u00a01883 eruption of Krakatoa<\/strong>\u00a0in the\u00a0Dutch East Indies<\/a>\u00a0(now\u00a0Indonesia<\/a>) began in the afternoon of Sunday, 26 August 1883 (with origins as early as May of that year), and peaked in the late morning of Monday, 27 August when over 70% of the island and its surrounding\u00a0archipelago<\/a>\u00a0were destroyed as it collapsed into a\u00a0caldera<\/a>. Additional\u00a0seismic<\/a>\u00a0activity was reported to have continued until February 1884, though reports of seismic activity after October 1883 were later dismissed by\u00a0Rogier Verbeek<\/a>‘s investigation into the eruption. The 1883 eruption was one of the deadliest and most destructive volcanic events in recorded history. At least 36,417 deaths are attributed to the eruption and the\u00a0tsunamis<\/a>\u00a0it created. Significant additional effects were also felt around the world in the days and weeks after the volcano’s eruption.<\/p>\n\n\n\n\n\n\n\n

Climactic phase<\/h2>\n\n\n\n

…<\/p>\n\n\n\n

On August 27, four enormous explosions occurred. At 5:30\u00a0am, the first explosion was at\u00a0Perboewatan<\/a>, triggering a tsunami heading straight to\u00a0Telok Betong<\/a>, now known as Bandar Lampung. At 6:44\u00a0am, Krakatoa exploded again at\u00a0Danan<\/a>, with the resulting tsunami stretching eastward and westward. The largest explosion, at 10:02\u00a0am, was so violent that it was heard 3,110\u00a0km (1,930\u00a0mi) away in\u00a0Perth<\/a>,\u00a0Western Australia<\/a>, and the\u00a0Indian Ocean<\/a>\u00a0island of\u00a0Rodrigues<\/a>\u00a0near\u00a0Mauritius<\/a>, 4,800\u00a0km (3,000\u00a0mi) away, where they were thought to be cannon fire from a nearby ship. The third explosion has been reported as the loudest sound heard in historic times.[2]<\/a><\/sup>[3]<\/a><\/sup>:79<\/sup>\u00a0The loudness of the blast heard 160\u00a0km (100\u00a0mi) from the volcano has been calculated to have been 180\u00a0dB<\/a>.[4]<\/a><\/sup>\u00a0Each explosion was accompanied by tsunamis estimated to have been over 30 meters (98 feet) high in places. A large area of the\u00a0Sunda Strait<\/a>\u00a0and a number of places on the Sumatran coast were affected by\u00a0pyroclastic flows<\/a>\u00a0from the volcano. The energy released from the explosion has been estimated to be equal to about 200\u00a0megatons of TNT<\/a>,[5]<\/a><\/sup>\u00a0roughly four times as powerful as the\u00a0Tsar Bomba<\/a>, the most powerful thermonuclear weapon ever detonated. At 10:41\u00a0am, a landslide tore off half of\u00a0Rakata<\/a>\u00a0volcano, causing the final explosion.<\/p>\n\n\n\n

Final explosive eruption<\/h3>\n\n\n\n

The pressure wave generated by the\u00a0colossal<\/a>\u00a0fourth and final explosion radiated out from Krakatoa at 1,086\u00a0km\/h (675\u00a0mph). The eruption is estimated to have reached 310\u00a0dB<\/a>, loud enough to be heard clearly 5,000 kilometres (3,100\u00a0mi) away.[6]<\/a><\/sup>:248<\/sup>\u00a0It was so powerful that it ruptured the eardrums of sailors 64\u00a0km (40 miles) away on ships in the Sunda Strait,[6]<\/a><\/sup>:235<\/sup>\u00a0and caused a spike of more than 2.5\u00a0inches of mercury<\/a>\u00a0(8.5\u00a0kPa) in pressure gauges 160\u00a0km (100 miles) away, attached to\u00a0gasometers<\/a>\u00a0in the\u00a0Batavia<\/a>\u00a0gasworks, sending them off the scale.[note 1]<\/a><\/sup><\/p>\n\n\n\n

The pressure wave was recorded on\u00a0barographs<\/a>\u00a0all over the world. Several barographs recorded the wave seven times over the course of five days: four times with the wave travelling away from the volcano to its\u00a0antipodal point<\/a>, and three times travelling back to the volcano.[3]<\/a><\/sup>:63<\/sup>\u00a0Hence, the wave rounded the globe three and a half times. Ash was propelled to an estimated height of 80\u00a0km (50\u00a0mi).<\/p>\n\n\n\n

The eruptions diminished rapidly after that point, and by the morning of 28 August, Krakatoa was silent. Small eruptions, mostly of mud, continued into October 1883. By then, less than 30% of the original island remained.<\/p>\n\n\n\n

Global optical effects<\/h3>\n\n\n\n

The 1883 Krakatoa eruption darkened the sky worldwide for years afterwards and produced spectacular sunsets throughout the world for many months. British artist\u00a0William Ashcroft<\/a>\u00a0made thousands of colour sketches of the red sunsets halfway around the world from Krakatoa in the years after the eruption. The ash caused “such vivid red sunsets that fire engines were called out in New York, Poughkeepsie, and New Haven to quench the apparent conflagration.”[18]<\/a><\/sup>\u00a0This eruption also produced a\u00a0Bishop’s Ring<\/a>\u00a0around the sun by day, and a volcanic purple light at twilight.<\/p>\n\n\n\n

In 2004, an astronomer proposed the idea that the blood-red sky shown in\u00a0Edvard Munch<\/a>‘s famous 1893 painting\u00a0The Scream<\/a><\/em>\u00a0is also an accurate depiction of the sky over\u00a0Norway<\/a>\u00a0after the eruption.[19]<\/a><\/sup><\/p>\n\n\n\n

Weather watchers of the time tracked and mapped the effects on the sky. They labeled the phenomenon the “equatorial smoke stream”.[20]<\/a><\/sup>\u00a0This was the first identification of what is known today as the\u00a0jet stream<\/a>.[21]<\/a><\/sup><\/p>\n\n\n\n

For several years following the eruption, it was reported that the moon appeared to be blue and sometimes green. This was because some of the ash clouds were filled with particles about 1\u00a0\u00b5m<\/a>\u00a0wide\u2014the right size to strongly scatter red light, while allowing other colors to pass. White moonbeams shining through the clouds emerged blue, and sometimes green. People also saw lavender suns and, for the first time, recorded\u00a0noctilucent clouds<\/a>.[18]<\/a><\/sup><\/p>\n","protected":false},"excerpt":{"rendered":"

wiki link The\u00a01883 eruption of Krakatoa\u00a0in the\u00a0Dutch East Indies\u00a0(now\u00a0Indonesia) began in the afternoon of Sunday, 26 August 1883 (with origins as early as May of that year), and peaked in the late morning of Monday, 27 August when over 70% of the island and its surrounding\u00a0archipelago\u00a0were destroyed as it collapsed into a\u00a0caldera. Additional\u00a0seismic\u00a0activity was reported […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[416,271],"tags":[445,446],"acf":[],"_links":{"self":[{"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/posts\/2526"}],"collection":[{"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/comments?post=2526"}],"version-history":[{"count":2,"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/posts\/2526\/revisions"}],"predecessor-version":[{"id":2529,"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/posts\/2526\/revisions\/2529"}],"wp:attachment":[{"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/media?parent=2526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/categories?post=2526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hesmid.nl\/test\/wp-json\/wp\/v2\/tags?post=2526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}