Heruningtyas Desi Purnamasari

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Ahmad Basuki

Universitas Tulungagung

Novianti Indrastuti

Meteorological, Climatological, And Geophysical Agency

Nia Haerani

Meteorological, Climatological, And Geophysical Agency

Devy Kamil Syahbana

Meteorological, Climatological, And Geophysical Agency

Sucahyo Adi

Meteorological, Climatological, And Geophysical Agency

Kristianto

Universitas Simalungun

Cahya Patria

Meteorological, Climatological, And Geophysical Agency

Kristianto Kristianto

Pertamina (Indonesia)

Deni Mardiono

Anjar Dwi Asterina Denhi

Sumatera Institute of Technology

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Meteorological, Climatological, And Geophysical Agency

Encana (Canada)

Universitas Simalungun

National Cheng Kung University

Universitas Tulungagung

Bandung Institute of Technology

Universitas Wijaya Kusuma Surabaya

Creative Commons

National Research and Innovation Agency

Pertamina (Indonesia)

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The use of UAV remote sensing for observing lava dome emplacement and areas of potential lahar hazards: An example from the 2017–2019 eruption crisis at Mount Agung in Bali

Journal of Volcanology and Geothermal Research (2021)

Ruli Andaru Jiann-Yeou Rau Devy Kamil Syahbana Ardy Setya Prayoga Heruningtyas Desi Purnamasari

Lahar

Dome (geology)

Lava dome

Volcanic hazards

Rockfall

Lateral eruption

10.1016/j.jvolgeores.2021.107255

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Citations (17)

DEFORMASI GUNUNG ANAK KRAKATAU PERIODE OKTOBER–DESEMBER 2019

Kristianto Kristianto Heruningtyas Desi Purnamasari Anjar Dwi Asterina Denhi Cahya Patria Sucahyo Adi

Gunung Anak Krakatau yang terletak di Selat Sunda merupakan kerucut basaltik andesit, yang tumbuh dengan cara erupsi secara eksplosif maupun efusif dengan perulangan waktu istirahat berkisar antara 1 – 6 tahun. Diperlukan pemantauan deformasi Gunung Anak Krakatau selama periode Oktober - Desember 2019 melalui analisis data GNSS campaign stasiun KRA1, KRA2 dan KRA3. Analisis data GNSS dan Tiltmeter stasiun Tanjung digunakan untuk mengetahui pola deformasi dan intrusi magma dari bawah permukaan. data DInSAR citra Sentinel-1A digunakan untuk mengetahui pola deformasi permukaan di Pulau Anak Krakatau.Selama periode Oktober - Desember 2019, aktivitas Gunung Anak Krakatau didominasi oleh aktivitas vulkanik di permukaan berupa letusan dan hembusan asap (degassing). Ketika menjelang dan saat berlangsungnya pengeluaran material vulkanik ke permukaan, menimbulkan tekanan terhadap permukaan yang mengakibatkan respon ungkitan pada peralatan tiltmeter. Nilai volume injeksi magma yang dihitung dari pola ungkitan tiltmeter adalah sebesar 15 – 34 m3/menit. Hasil prosesing data GNSS menunjukkan bahwa periode Oktober -Desember 2019 Gunung Anak Krakatau memiliki pola deflasi. Konsisten terhadap aktivitas erupsi Gunung Anak Krakatau yang didominasi Gempa Hembusan pada periode tersebut yang menjadi tanda terjadinya pelepasan energi di Gunung Anak Krakatau, pengolahan DINSAR S-1A menunjukkan pola inflasi akibat endapan material hasil erupsi dan pola deflasi diduga material di permukaan mengalami perpindahan menuju dataran yang lebih rendah (ke arah laut) akibat erosi air hujan.

Tiltmeter

Source

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The 2021 Semeru volcano eruption: An insight from visual, seismic, and deformation monitoring data

IOP Conference Series Earth and Environmental Science (2023)

Kristianto Ahmad Basuki Heruningtyas Desi Purnamasari Devy Kamil Syahbana

Abstract Semeru is the highest volcano on the island of Java and one of Indonesia’s volcanoes that has a potential threat of pyroclastic flows. The eruption of Semeru often shows a transition pattern between explosive and effusive styles. An increased eruptive activity occurred in 2021 with series of explosions dominated the first two thirds of the year and then transition to series of pyroclastic flows in December 2021. On 4 December 2021, a dome collapse triggered significant pyroclastic flows that reached a maximum distance of 16 km from the crater and resulted in 51 casualties. In this paper, we aimed to study the dynamics of magma movement from depth to the surface and assessing the style transition of the eruptions between explosive and effusive activity from visual, seismic and deformation monitoring data. We analyzed Semeru volcano monitoring data throughout the year 2021. The volcanic activity monitoring system of Semeru volcano consists of 4 seismic stations, 5 deformation stations (2 tiltmeters and 3 GPS stations), and 2 Web Camera/CCTV. Our analysis on seismic data indicates that the series of large pyroclastic flows were triggered by excess pressure at shallow depths a few hours before the events. Deep volcanic earthquakes are relatively increased after the collapse of the lava dome or pyroclastic flows, possibly caused by the sudden decrease in hydrostatic pressure of the rock mass around the magma pocket, thus triggering gas expansion. Deformation monitoring using a tiltmeter at Argosuko and Jawar stations indicates inflation of a deep source since 15 August 2021. Since 7 November 2021, tiltmeter measurement has shown deep source deflation patterns which indicate magma movement from the deep reservoir to a shallower reservoir. After 21 November, inflation of the deep source was observed again, indicating an increase in magma supply from the deep pocket. The results of the pressure source modeling from GPS vector data in the period before the eruption, 1 November – 4 December 2021, showed an anomaly in the form of an increased volume at a depth of > 1.7 km of about 0.84 million/m3. Between 5 December and 31 December 2021, after the 4 December pyroclastic flow, the deformation modeling indicates the transition of the pressure source from a depth of 1.7 km to 8 km. In addition, we also observed a decrease in volume of 5.6 million/m3. The deformation pattern at shallow depths showed a deflationary pattern indicating a decrease in magma overpressure.

Tiltmeter

Lava dome

Dome (geology)

10.1088/1755-1315/1227/1/012030

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Citations (1)

Potential Eruption and Current Activity of Anak Krakatau Volcano, Indonesia

IOP Conference Series Earth and Environmental Science (2021)

Kristianto Novianti Indrastuti Ahmad Basuki Heruningtyas Desi Purnamasari Sucahyo Adi

Abstract Anak Krakatau Volcano is located in the Sunda Strait known for its paroxysmal eruption in 1883. During the January - November 2019 period, seismicity was dominated by types of quakes which indicated the occurrence of magma supply (VA and VB), near-surface volcanic activity (LF, Hybrid, Harmonic Tremors), and volcanic activity above the volcanic surface (eruptions, emission, and continuous tremors). In the period December 2019 - July 2020, there was an increase in the types of quakes near the surface (LF, Hybrid) and the types of quakes on the surface (emission and continuous tremors). Volcanic deformation monitors changes in tilt over the 2019-2020 period associated with pressure releases before, during and after the eruption. The results of GPS data modeling, the shallow pressure source is at a depth of 0.22 km below sea level. Volcanic activity until July 2020 was dominated by activity near and above the volcanic surface associated with the growth of lava domes. The volcanic system of Anak Krakatau is currently an open system, with the potential for eruptions. Strengthening the early warning system for the eruption of Anak Krakatau is important in mitigating efforts and understanding its eruption potential

Vulcanian eruption

Effusive eruption

Lava dome

Dense-rock equivalent

10.1088/1755-1315/873/1/012021

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Citations (4)