Mount Anak Krakatau is located in the Sunda Strait (the strait between the islands of Java and Sumatra), Indonesia has been known to the world since its largest eruption in 1883. The eruption was only inferior to the 7-scale eruption of Mount Tambora in 1815 and the 8-scale eruption of Mount Toba in North Sumatra, 74,000 in 2017.
The Krakatoa eruption was said to be 21,574 times the explosive power of the atomic bomb that melted Hiroshima (De Neve, 1984). In addition to obliterating the island of Krakatoa, the eruption destroyed life on the coasts of Banten and Lampung.
At that time, Anak Krakatau erupted by spewing volcanic ash and water vapor that was hurled into the air as high as 11 kilometers from the Crater of Action. The sound of the explosion was heard up to 200 kilometers away. The intensity increased on August 26 and peaked on Monday August 27. On August 27, fine rock and ash were blown into the sky. Its height reaches 70-80 kilometers. It resulted in world weather disturbances a few years later
The sun's rays were unable to penetrate the volcanic ash that was ejected at that time, so the southern parts of the islands of Sumatra and Java became pitch black. Its deposits cover an area of 827,000 square kilometers. Mud eruptions occurred in September and October 1833 until February 1884. Then came a period of calm for 44 years, until the appearance of the new Anak Krakatau in August 1930. Mount Anak Krakatau is what is known today.
Present-day Anak Krakatau is an island in a caldera in the Sunda Strait between the islands of Java and Sumatra in Indonesia's Lampung Province. On December 29, 1927, Anak Krakatau emerged from a caldera formed in 1883 by an explosive volcanic eruption that destroyed the island of Krakatoa.
There has been sporadic eruptive activity at the site since the late 20th century, culminating with the collapse of a large underwater volcano that caused a deadly tsunami in December 2018, followed by subsequent activity in 2019 and an eruption in April 2020.