Raditya Putra

Meteorological, Climatological, And Geophysical Agency

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Hanik Humaida

Badan Pengkajian dan Penerapan Teknologi

Agus Santoso

ARC Centre of Excellence for Climate System Science

François Beauducel

Institut de physique du globe de Paris

Virginie Pinel

Université Savoie Mont Blanc

Akhmad Solikhin

Meteorological, Climatological, And Geophysical Agency

Shan Grémion

Institut des Sciences de la Terre

Karim Kelfoun

Centre National de la Recherche Scientifique

Sulistiyani

Meteorological, Climatological, And Geophysical Agency

Nurnaning Aisyah

Badan Pengkajian dan Penerapan Teknologi

Dewi Sri Sayudi

Badan Pengkajian dan Penerapan Teknologi

Cooperative Institutions

Centre National de la Recherche Scientifique

Institut de Recherche pour le Développement

United States Geological Survey

Meteorological, Climatological, And Geophysical Agency

Cascades Volcano Observatory

Université Savoie Mont Blanc

Institut des Sciences de la Terre

Université Gustave Eiffel

Université Grenoble Alpes

Badan Pengkajian dan Penerapan Teknologi

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Heterologous expression of Trichoderma reesei exoglucanase (Cel6A) in Pichia pastoris under the control of GAP promoter

AIP conference proceedings (2019)

Trisanti Anindyawati Raditya Putra Yuliawati Yuliawati Kartika Sari Dewi Asrul Muhamad Fuad

Cellulolytic microorganisms produce several cellulase enzymes which have different specificities and modes of action. At least three types of cellulase (endo, exo, and β-glucosidase) are involved in the degradation of cellulose. One of them, exo-β-1,4 glucanase or cellobiohydrolase, can release either glucose or cellobiose from ends of cellulose chains. In this study, we tried to express an exoglucanase (Cel6A) gene heterologically in Pichia pastoris. The Cel6A gene was derived from Trichoderma reesei cellobiohydrolase 2 (CBH2). It was synthetically prepared, and codon optimized for best expression in yeast P. pastoris. The gene was placed under the regulation of the GAP promoter. The recombinant plasmid, named pLIPI-TrCel6A, inserted with T. reesei Cel6A (TrCel6A) gene has been integrated into P. pastoris SMD1168H genome, and the recombinant enzyme has been successfully expressed by P. pastoris with a major product showing a molecular size of around 50 kDa.

Heterologous

Heterologous expression

10.1063/1.5125548

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Citations (1)

Growth and collapse of the 2018–2019 lava dome of Merapi volcano

Bulletin of Volcanology (2021)

Karim Kelfoun Agus Santoso Thierry Latchimy Martial Bontemps Ilham Nurdien

Lava dome

Dome (geology)

Volcanic cone

Stratovolcano

10.1007/s00445-020-01428-x

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Citations (29)

Tracking the evolution of the Merapi volcano crater area by high-resolution satellite imagery

Virginie Pinel Raditya Putra Akhmad Solikhin François Beauducel Agus Santoso

Located about 30 km north of the city of Yogyakarta, Merapi is considered as one of the most dangerous volcano of Indonesia with 3000 to 5000 fatalities since 1672 and about two million people living at less than 30 km from the crater. The recent eruptive history of Merapi is characterized by two eruptive styles: 1) recurrent effusive growth of viscous lava domes, with gravitational collapses producing pyroclastic flows known as &#171; Merapi-type nu&#233;es ardentes &#187; (VEI 2); 2) more exceptional explosive eruptions of relatively large size (VEI 3-4), associated with column collapse pyroclastic flows reaching distances larger than 15 km from the summit. The eruptive periodicity is 4 to 5 years for the effusive events and 50 to 100 years for the explosive ones. The last explosive events (VEI 3-4) occurred in November 2010 and opened a 500m wide and 250m deep crater. After the 2010 eruption, the activity has been reduced. We used TerraSAR-X data to characterize eruptive deposits emplaced during the 2010 event as well as sudden destabilization of crater walls. The activity increased significantly during the spring of 2018 when several phreatic eruptions were recorded with ash emission reaching an elevation of more than 5 kilometers. The 11th of August 2018 a new dome was observed inside the summit crater, thus marking the start of a new phase of effusive activity. It is essential to be able to quantitatively follow the temporal evolution of the dome shape and volume through time as its potential destabilisation would produce pyroclastic flow on the volcano flank. A time series of five tri-stereo Pleiades optical images, acquired between February and September 2019, is used to produce High Resolution DEMs of Merapi summit area with a spatial resolution of 3 m and a vertical precision of 1 m. By using a DEM derived from Pleiades stereo images acquired in April 2013 as a reference, the dome volume evolution through time is estimated. We show that the dome had already reached a volume around 0.5 Mm3 (+- 0.02Mm3) end of February 2019 corresponding to a mean effusive rate of 3000 m3/day during 6 months and that its size remained constant after February 2019. These results are consistent with volume estimations derived from drone measurements. However DEMs derived from Pleiades images enable to monitor a larger area and reveal accumulation of eruptive deposits due to dome destabilization a few hundreds of meters below the dome. The magma effusive rate thus remained significant but was reduced to 250 m3/day from February to September 2019.

Dome (geology)

Phreatic eruption

Lava dome

Elevation (ballistics)

Phreatic

10.5194/egusphere-egu2020-5415

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Citations (2)

Tracking the evolution of the summit lava dome of Merapi volcano between 2018 and 2019 using DEMs derived from TanDEM-X and Pléiades data

Journal of Volcanology and Geothermal Research (2022)

Shan Grémion Virginie Pinel Tara Shreve François Beauducel Raditya Putra

Lava dome

Dome (geology)

Elevation (ballistics)

10.1016/j.jvolgeores.2022.107732

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Citations (7)

Numerical Simulation of Mt. Merapi Pyroclastic Flow in 2010

Journal of Disaster Research (2019)

Makoto Shimomura Raditya Putra Niken Angga Rukmini Sulistiyani

A pyroclastic flow is one of the most dangerous hazardous phenomena. To escape a pyroclastic flow, the influenceable area must be evacuated before the flow occurs. Therefore, to predict the inundation area of a pyroclastic flow is important, and numerical simulation is a helpful tool in this prediction. This study simulated a pyroclastic flow by reproducing the pyroclastic flow of Mt. Merapi that occurred in 2010. However, necessary detailed information of the flow to conduct the simulation, such as total volume and the property of the pyroclastic flow material, flow rate, etc., were not available. Therefore, 20 simulations were conducted, varying the important conditions, such as the volume of pyroclastic material, inter-granular friction factor, and duration of the flow. The results showed that the volume of the pyroclastic material and inter-granular friction factor strongly control the flow characteristics. However, the friction factor does not result in a wide range of values; therefore, volume is the most influencing factor. The most suitable condition is a total volume of pyroclastic material of 30 × 10 6 m 3 , a 5 min duration of flow, and a 0.6 friction factor.

Pyroclastic fall

10.20965/jdr.2019.p0105

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Assessing the Pyroclastic Density Current Hazards at Merapi: From Field Data to Numerical Simulations and Hazard Maps

Active volcanoes of the world (2023)

Sylvain Charbonnier Karim Kelfoun Christina Widiwijayanti Dewi Sri Sayudi Raditya Putra

Volcanic hazards

10.1007/978-3-031-15040-1_16

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Monitoring of Merapi volcano, Indonesia based on Sentinel-1 data

Virginie Pinel François Beauducel Raditya Putra Sulis Sulistiyani Gusti Made Agung Nandaka

Despite the well-established interest of Synthetic Aperture Radar data for volcanoes study and monitoring, their integration to operational monitoring activities in volcanoes observatories remains limited so far. We here describe the effort in progress to integrate in near real time the information derived from Sentinel-1 satellites into the monitoring devices at BBPTKG in charge of Merapi volcano survey as well as the use of Sentinel-1 data during the recent period of &#160;unrest. Merapi (7&#176;32.5&#8217; S and 110&#176;26.5&#8217; E) located in the densely populated Province of Yogyakarta in Central Java is one of the most active volcanoes in Indonesia. The eruptive history of Merapi is characterized by two eruptive styles: 1) recurrent effusive growth of viscous lava domes, with gravitational collapses producing pyroclastic flows known as &#171; Merapi-type nu&#233;es ardentes &#187; (VEI 2); 2) more exceptional explosive eruptions of relatively large size (VEI 3-4), associated with column collapse pyroclastic flows reaching distances larger than 15 km from the summit. The eruptive periodicity is 4 to 5 years for the effusive events and 50 to 100 years for the explosive ones. The last explosive events (VEI 3-4) occurred in November 2010 and was followed by a period of limited activity. In August 2018, a new dome was observed inside the summit crater, thus marking the start of a new phase of effusive activity. A new period of unrest then started in mid-October 2020, characterized by an increase in seismic activity as well as large and localized displacements in the summit area. Magma finally reached the surface on 4 &#160;January 2021. Deformation is currently recorded by EDM and tiltmeters together with a network of 10 permanent GNSS stations. GNSS data are automatically processed and inverted for a pressure source at depth. Both displacement time series as well as spatial probability distribution are directly available through WebObs (Beauducel et al., Frontiers, 2020), an integrated web-based system for monitoring. Sentinel-1 data are acquired over the volcano every 12 days on descending track 76 and every 6 days on ascending track 127. Since mid 2017, Sentinel-1 data are automatically downloaded on a local server at BPPTKG. Interferograms and coherence images are then produced using the NSBAS processing chain (Doin et al, 2012) and automatically integrated to WebObs to enable detection of potential rapid and significant changes in signal. Mean velocity maps are also produced as well as time series of surface displacement at given location enabling direct comparison with GNSS measurements. The descending InSAR time series shows a strong displacement away from the satellite in a 1.5 km wide area located on the north-eastern part &#160;of the crater. This signal became significant in September 2020. It is consistent with field measurements recorded and allows to map the affected area. In mid-November 2020, Sentinel-1 data thus provided the first information on the spatial extent of the ongoing surface displacements, which was useful for crisis management.

Strombolian eruption

Lava dome

Unrest

10.5194/egusphere-egu21-10392

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Citations (1)

PEMETAAN SITUASI PUNCAK G. ROKATENDA , NUSA TENGGARA TIMUR, 2019, DENGAN MENGGUNAKAN DRONE

Imam Santosa Supriyati D. Andreastuti Raditya Putra Roni Taufiqurrohman

Gunung Rokatenda dengan ketinggian 875 m di atas permukaan laut merupakan pulau gunungapi, berbentuk strato dengan komposisi batuan andesitik. Gunung ini terletak di Pulau Palue, Kabupaten Sikka, Nusa Tenggara Timur. Erupsi Gunung Rokatenda menurut catatan terjadi pada tahun 1928, 1972, 1973, 1985, 2012-2013. Erupsi tahun 2012-2013 dijadikan acuan dalam menyiapkan strategi saat terjadi bencana. Hasil studi sebelumnya memperlihatkan bahwa stratigrafi gunung ini terdiri dari 4 periode, yaitu periode erupsi efusif yang menghasilkan aliran lava, periode campuran erupsi efusif dan eksplosif yang menghasilkan aliran lava dan aliran piroklastik, periode erupsi efusif dari erupsi samping dan periode erupsi efusif yang menghasilkan aliran lava, dan pembentukan kubah lava di sekitar tubuh Gunung Rokatenda, serta pembentukan lahar dan alluvial. Salah satu komponen yang dibutuhkan dalam penyiapan strategi tersebut adalah informasi tentang situasi kawah yang dapat diperoleh melalui pemetaan situasi menggunakan wahana drone yang dilakukan pada tahun 2019.Hasil pemetaan menggunakan drone memperlihatkan Gunung Rokatenda mempunyai 4 kawah, yaitu kawah pertama pada bagian tenggara merupakan kawah terbesar, kawah kedua terletak pada bagian barat laut-utara, kawah ketiga pada bagian barat dan kawah keempat yang diperkirakan terletak pada bagian barat-barat laut puncak Gunung Rokatenda. Kegiatan ini berguna untuk memahami situasi puncak, perkembangannya dibanding dengan sebelumnya, potensi dampak dan wilayah terancam yang dapat digunakan sebagai salah satu alat/bahan dalam pelaksanaan penanggulangan bencana Gunung Rokatenda.

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Morfologi Caenorhabditis sp. Indonesia yang Dibiakkan dari Kompos dan Identifikasi Spesiesnya melalui Amplifikasi Gen mtCOI

Raditya Putra

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Morphology and Instability of the Merapi Lava Dome Monitored by Unoccupied Aircraft Systems

Active volcanoes of the world (2023)

Herlan Darmawan Raditya Putra Agus Budi-Santoso Hanik Humaida Thomas R. Walter

Lava dome

Dome (geology)

10.1007/978-3-031-15040-1_15

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Citations (5)