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2011年8月4日星期四

衛星圖像顯示火山灰羽從喀拉喀托漂流

衛星圖像顯示火山灰羽從喀拉喀托漂流
Satellite Image Shows Ash Plume Drifting From Krakatoa
By Mark Dunphy -
Tue Aug 02, 9:16 pm
Translation by Autumnson Blog

A newly released NASA satellite image shows an ash plume drifting from a volcano that produced one of the largest eruptions in modern history.
一張新近公佈的美國航空航天局衛星圖像顯示,一條灰羽從產生現代歷史其中一次最大的火山噴發的火山漂流。
Anak Krakatau (also known as Krakatoa), a volcanic island in the Sunda Strait between the islands of Java and Sumatra in Indonesia, has been intermittently active for the past several decades.
阿納喀拉喀托(又稱喀拉喀托)是一個火山島,在巽他海峽的印尼爪哇和蘇門答臘的島嶼之間,在過去幾十年一直間歇性地活躍。
The island exploded in 1883, killing approximately 40,000 people, although some estimates put the death toll much higher. The explosion is considered to be the loudest sound ever heard in modern history, with reports of it being heard nearly 3,000 miles (4,800 km) from its point of origin. The shock wave from the explosion was recorded on barographs around the globe.

On July 31, 2011, a wispy ash plume rose above the volcano and drifted west (up in the below image). The natural-colour satellite image was acquired by the Advanced Land Imager (ALI) aboard Earth Observing-1 (EO-1). Dark gray areas of Anak Krakatau are composed principally of lava flows deposited in the 1970s, ’80s, and ’90s. These flows are topped by a young cinder cone near the center of the island. Green vegetation covers older lavas along the eastern coastline.
The last significant activity at the volcano occurred in January 2011 when ash was emitted more than 600 m into the air, forcing the evacuation of tens of thousands of residents. A 2km exclusion zone was also put in place for tourists and local fishermen. The volcano also erupted on 29th October 2010 leading Indonesian authorities to issue a level 2 alert.

NASA image by Jesse Allen and Robert Simmon, using data from the Advanced Land Imager (ALI) aboard theEarth Observing-1 (EO-1) satellite. Caption by Robert Simmon. Instrument: EO-1 – ALI

http://www.irishweatheronline.com/news/earthquakesvolcanos/satellite-image-shows-ash-plume-drifting-from-krakatoa/29524.html

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