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All Journal Indonesian Journal of Geography IJOG : Indonesian Journal on Geoscience Journal of Applied Geology
Haryo Edi Wibowo
Department Of Geological Engineering, Faculty Of Engineering, Universitas Gadjah Mada, Indonesia
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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Journal : Indonesian Journal of Geography

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Topography and structural changes of Anak Krakatau due to the December 2018 catastrophic events Herlan Darmawan; Bachtiar Wahyu Mutaqin; Wahyudi Wahyudi; Agung Harijoko; Haryo Edi Wibowo; Nia Haerani; Mamay Surmayadi; Syarifudin Syarifudin; Raditya Jati; Suratman Suratman; Wikanti Asriningrum
Indonesian Journal of Geography Vol 52, No 3 (2020): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.53740

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.
Source Determination of Debris Avalanche Deposit based on the Morphology and Distribution of Hummocky Hills on the Northeastern Flank of G. Sundoro and G. Sumbing, Central Java, Indonesia Rahayu, Eti; Wibowo, Haryo Edi; Moktikanana, Mradipta Lintang Alifcanta; Setianto, Agung; Harijoko, Agung
Indonesian Journal of Geography Vol 55, No 3 (2023): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.88213

Abstract

The presence of hummocky hills as a typical product of debris avalanche deposits is prominently visible in the northeastern flank of G. Sundoro and G. Sumbing, Temanggung, Central Java. In an attempt to better understand the past behavior of both G. Sundoro and G. Sumbing, we identify the source of the debris avalanche deposit. Interpretation is performed on the basis of the assumption of two possible sector collapse sources, i.e., G. Sundoro and G. Sumbing. The Sumbing source scenario is assumed as freely spreading type considering 1) distribution of the hummocky hills are relatively on the northeastern flank of the volcano, and 2) the present crater structure on the summit of the volcano which is opening to the northeast. The Sundoro source scenario is assumed as valley-filling type considering the distribution of the hummocky hills are relatively on the eastern flank of Sundoro extended to the far distal area and bounded by older high topography of G. Sumbing and North Serayu Mountains. The source identification was done on the basis of field observation of the deposit lithological characteristics combined with image analysis, including hummocky hills morphometry, displacement angle, and spatial distribution. Image analysis identifies approximately 645 hummocky hills ranging from 1,851 mz to 623,828 mz and average of 23,482 m2. Petrographic analysis of 5 representative block lava samples shows variation of olivine basalt, pyroxene andesite, to hornblende andesite. The results show that big size hummocky hills dominate the western side, while small size on the east. Displacement angle varied following the valley orientation with typical downslope topography. These suggested that the hummocky hills were originated from G. Sundoro as a valley-filling debris avalanche deposit.
Co-Authors Agung Harijoko Agung Setianto Anggun Purnama Edra Bachtiar Wahyu Mutaqin Cahyani, Sherinna Mega Ferian Anggara Herlan Darmawan Indranova Suhendro Mamay Surmayadi Mohammad Yazid Abdillah Moktikanana, Mradipta Lintang Alifcanta Mradipta Lintang Alifcanta Moktikanana Nia Haerani Nugroho Imam Setiawan Prawira Sari, Shafa Hadaina Purnama Edra, Anggun Raditya Jati Rahayu, Eti Suratman Suratman Syarifudin Syarifudin Wahyudi Wahyudi Wikanti Asriningrum