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All Journal IJOG : Indonesian Journal on Geoscience Journal of Geoscience, Engineering, Environment, and Technology
Adriansyah, David
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Numerical Simulation of Pyroclastic Flow of Karangetang Volcano Based on 2015 Eruption Activity Banggur, Willi FS; Patria, Cahya; Kriswati, Estu; Abdurrachman, Mirzam; Suantika, Gede; Syahbana, Devy Kamil; Korompis, Richard; Adriansyah, David; Gurasali, Aditya; Wenas, Alfred; Praja, Kurnia; Sentosa, Imam; Kusnadi, Iing; Shimomura, Makoto
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 1 (2024): JGEET Vol 09 No 01 : March (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.1.14217

Abstract

On May 7-9, 2015 the eruptive activity of Mount Karangetang released pyroclastic flows towards the Batuawang River for 3.6 km and hit Kora kora village which is located south of the Main Crater. This pyroclastic flow originated from lava flows during the effusive eruption period. MODIS satellite image hotspot data shows the lava flow extrusion rate and total volume at the peak began to increase since April 2015 and continued to show an increase until December 2015, with the estimated volume and lava extrusion rate on  April 22, 2015 reaching 4.16x106 m3 and 0.53 m3/s, respectively, and on December 9, 2015 the volume reached 1.67x107 m3 with a lava extrusion rate of 1.97 m3/s. The results of field checks show that this pyroclastic flow is dominated by block and ash, and by using numerical simulations show the deflection of pyroclastic flow in accordance with the flow field of the Batuawang river, and the splash of pyroclastic flow towards Kora kora village in addition to the location adjacent to the river flow and also controlled by the narrowing of the river channel due to the accumulation of material in the flow field. A total of 8 numerical simulation cases have been carried out, and in our opinion with an input volume of 500 x103 m3 and a flow material friction of 0.5 is a case that corresponds to a flow event that reaches a distance of 3.6 km from the Main Crater.  Taking into account the current activity conditions we used the same parameters to estimate the area that could be affected by pyroclastic flows in the future. Numerical simulation show that the pyroclastic flow traveled 5 km in a south-southwest direction from the top of the main crater.
Explosive Signature of The April 30th, 2024 Ruang Volcano Eruption in The Sangihe Arc, Indonesia, Inferred from Erupted Material Characteristics: A Preliminary Assessment Purnamasari, Heruningtyas Desi; Saepuloh, Asep; Primulyana, Sofyan; Adriansyah, David; Prayoga, Ardy Setya; Agustiningtyas, Lestari; Wijaya, P. Hadi; Gunawan, Hendra
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.11-17

Abstract

The 2024 eruptions of Ruang Volcano in North Sulawesi, Indonesia, represent one of the most explosive and impactful volcanic events in the region's recent history. The eruption sequence, which commenced on April 16th and peaked with significant explosive episodes on April 17th and 30th, resulted in the evacuation of over 9,000 residents and demonstrated the volcano’s capacity for high-energy eruptive activity. This preliminary analysis of the April 30, 2024, Ruang Volcano eruption emphasises the importance of ejected materials—such as high-vesicular juvenile fragments, crystal-rich components, and megacrysts of amphibole (hornblende)—in revealing the eruption’s explosive signature. Geochemical analysis of juvenile materials indicates a basaltic andesite composition, with SiO₂ contents ranging from 53.02% to 54.27%. Petrographic examination and SEM observations reveal high vesicularity, ruptured bubble walls, and microlite-rich groundmass textures, indicative of rapid ascent and intense degassing, which facilitated efficient magma fragmentation. These features suggest that the magma underwent rapid decompression. Understanding these properties provides important clues about the mechanisms underlying the explosiveness of the Ruang eruption.
Co-Authors Abdurrachman, Mirzam Agustiningtyas, Lestari Asep Saepuloh Banggur, Willi FS Cahya Patria, Cahya Estu Kriswati Gede Suantika Gurasali, Aditya HENDRA GUNAWAN B11211055 Korompis, Richard Kusnadi, Iing Praja, Kurnia Prayoga, Ardy Setya Purnamasari, Heruningtyas Desi Sentosa, Imam Shimomura, Makoto Sofyan Primulyana Syahbana, Devy Kamil Wenas, Alfred Wijaya, P. Hadi