Tsunami and the Recent Eruption of Anak Krakatau Volcano, Sunda Strait, Indonesia

Hill Gendoet Hartono, . and Adjat Sudradjat, . (2019) Tsunami and the Recent Eruption of Anak Krakatau Volcano, Sunda Strait, Indonesia. In: PROCEEDINGS JOINT CONVENTION YOGYAKARTA 2019, HAGI – IAGI – IAFMI- IATMI (JCY 2019), 25-28 November 2019, Tentrem Hotel.

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Abstract

On December 22, 2018 tsunami hit the beaches of western Banten and South Lampung in Sunda Strait, Indonesia. The tsunami claimed lives of 359 persons dead and 60 others missing. Noiseless tsunami came ashore as high as 2 meters and inundated the beach about 200 meters run-up. There was no sign of earthquake and volcanic eruption. Those two precursors of tsunami generation did not occur, therefore no warning was issued. Based on the satellite image analysis it was revealed that the SW wedge of Anak Krakatau volcanic body slid down leaving the body broken. As many as 22.5 million cu meters of materials entered the sea and generated tsunami. The sliding might have taken place due to the steep slope exceeding 42.50 of the volcanic body and the unconsolidated clastic materials it composed. Additionally the long duration of volcanic trembling might have triggered the sliding. The slumping gave way to the uprising magma and finally on December 24 it burst out comparable to Saint Helens or Bandai-San types, though at a very small scale. The sea entered the orifice of the new crater and produced the Surtseyan type eruption. The proceeding activity on 26 December closed the crater from the open sea creating a crater lake. The present summit of Anak Krakatau decreased to about 250 meters from the initial elevation of about 450 meters. The new crater shifted about 5 meters NW along the weak line of Rakata-Danan-Perbuwatan.
Keywords: Tsunami, land sliding of Anak Krakatau, Saint Helens type, Surtseyan type, decrease of the summit

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Tsunami, land sliding of Anak Krakatau, Saint Helens type, Surtseyan type, decrease of the summit
Subjects:	Q Science > QE Geology
Depositing User:	suma SR romdani
Date Deposited:	11 Dec 2020 12:42
Last Modified:	11 Dec 2020 12:42
URI:	https://repository.itny.ac.id/id/eprint/2575

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