Topography and structural changes of Anak Krakatau due to the December 2018 catastrophic events

https://doi.org/10.22146/ijg.53740

Herlan Darmawan(1*), Bachtiar Wahyu Mutaqin(2), Wahyudi Wahyudi(3), Agung Harijoko(4), Haryo Edi Wibowo(5), Nia Haerani(6), Mamay Surmayadi(7), Syarifudin Syarifudin(8), Raditya Jati(9), Suratman Suratman(10), Wikanti Asriningrum(11)

(1) Laboratory of Geophysics, Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta, Indonesia
(2) 2Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Indonesia
(3) Laboratory of Geophysics, Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta, Indonesia
(4) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Indonesia
(5) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Indonesia
(6) Center for Volcanology and Geological Hazards Mitigation, Geological Agency, Ministry of Energy and Mineral Resources, Bandung, Indonesia
(7) Center for Volcanology and Geological Hazards Mitigation, Geological Agency, Ministry of Energy and Mineral Resources, Bandung, Indonesia
(8) Bengkulu - Lampung Natural Resource Conservation Agency, Jl. Z.A. Pagar alam No. 1B Rajabasa Bandar Lampung
(9) Indonesian National Board for Disaster Management, Jl. Pramuka Kav. 38 Jakarta Timur 13120
(10) Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Indonesia
(11) Remote sensing application center, National Institute of Aeronautics and Space of Indonesia, Pasar Rebo, Jakarta Timur, Indonesia
(*) Corresponding Author

Abstract


The flank collapse of Anak Krakatau on 22 December 2018 caused massive topography losses that generated a devastating tsunami in Sunda Strait, which then followed by eruptions that progressively changed the topography and structure of Anak Krakatau. Here, we investigated topography and structural changes due to the December 2018 flank collapse and the following eruptions by using high resolution Digital Elevation Model (DEM) before and after the events and sentinel 1A satellite image post-flank collapsed. Results show that the volumetric losses due to the 22 December 2018 flank collapsed is ~127 x 106 m3, while the following eruptions caused ~0,8 x 106 m3 losses. Structural investigation suggests two structures that may act as failure planes. The first structure is located at the western part of volcanic edifice that associated with hydrothermal alteration and the second failure is an old crater rim which delineated an actively deform volcanic cone.

Keywords


Anak Krakatau; the 22 DAnak Krakatau; the 22 December flank collapse; Digital Elevation Model; Topography and structural changesecember flank collapse, Digital Elevation Model, Topography and structural changes

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DOI: https://doi.org/10.22146/ijg.53740

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Copyright (c) 2020 Herlan Darmawan, Bachtiar Wahyu Mutaqin, Wahyudi Wahyudi, Agung Harijoko, Haryo Edi Wibowo, Nia Haerani, Mamay Surmayadi, Syarifudin Syarifudin, Raditya Jati, Suratman Worosuprojo, Wikanti Asriningrum

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