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All Journal Jurnal Teknik ITS REKA GEOMATIKA IJOG : Indonesian Journal on Geoscience Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Engineering and Technological Sciences

Estu Kriswati

Pusat Vulkanologi Dan Mitigasi Bencana Geologi

Author-ID : 2775739

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Physics

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Pertumbuhan Retakan Pada Peningkatan Aktivitas Gunung Egon, Nusa Tenggara Timur Periode Desember 2015 – Januari 2016 Estu Kriswati; Novia Antika Anggraeni; Sucahyo Adi; Devy K. Syahbana; Ilham Mardikayanta; Herman Yosef Mboro
Jurnal Lingkungan dan Bencana Geologi Vol 7, No 2 (2016)
Publisher : Badan Geologi

ABSTRAKPeningkatan aktivitas Gunung Egon terjadi pada pertengahan Desember 2015. Tingkat aktivitas dinaikkan dari Level I (Normal) menjadi Level II (Waspada) pada 15 Desember 2015 dan kemudian dinaikkan menjadi level III (Siaga) pada 13 Januari 2016 sejalan dengan peningkatan aktivitas kegempaan yang makin intensif. Pemantauan kegempaan merupakan metode yang paling umum digunakan untuk menentukan tingkat aktivitas gunungapi dan untuk memprediksi letusan gunungapi. Pembahasan aktivitas vulkanik Gunung Egon ditujukan untuk memahami peningkatan aktivitas yang terjadi pada Desember 2015 – Januari 2016 berdasarkan analisis data kegempaan. Hal ini didukung oleh hasil pengamatan visual serta pengukuran kandungan gas di udara di sekitar gunung. Gempagempa vulkanik yang terekam pada seismometer Gunung Egon periode Desember 2015 - Januari 2016 meningkat dari segi jumlah dan mempunyai sumber yang dangkal di bawah puncak gunung. Peningkatan energi gempa vulkanik yang ditimbulkannya cukup signifikan. Analisis statistik terhadap gempa pada Gunung Egon yang memperlihatkan nilai-b cukup rendah, dan merupakan hasil dominansi jumlah gempa tektonik. Peningkatan nilai-b pada periode 2015 - 2016 dibandingkan periode 2014 - 2015 diartikan sebagai peningkatan retakan/rekahan di sekitar Gunung Egon. Kemungkinan adanya peningkatan retakan yang terjadi di Gunung Egon didukung oleh adanya peningkatan tinggi asap hembusan solfatara dan adanya peningkatan kandungan gas SO2 pada Januari 2016 yang melebihi ambang batas.Kata kunci: aktivitas gunungapi, gempa vulkanik, nilai-b, peningkatan retakanABSTRACTIncreasing the activity of Egon Volcano occured in mid-December 2015. The level of activity of the volcano raised from Level I to Level II on December 15, 2015 and raised Egon to level III on January 13, 2016 due to the intensif increase on the seismic activity. The seismic method is commonly applied for volcanic monitoring, volcanic eruption prediction, and determining the activity level of active volcanoes. Discussion of the volcanic activity of Egon Volcano aims to understand the increasing activity from December 2015 to January 2016 based on seismic data, supported by visual observation and gas content measurement in the air around Egon. Volcanic earthquakes at Egon Volcano in the period of December 2015 - January 2016 increased significantly in number, with hypocentres distributed in the shallow depth beneath the Egon summit. This means there was also a significant increase in volcanic earthquake energy. Statistic analysis of the earthquakes shows the b-value is quite low, indicating the dominancy of tectonic earthquakes. The increase in b-value during the period of 2015-2016 compared to the period of 2014 - 2015 is defined as the increasing of cracks/fissures in the vicinity of the volcano. The possibility of the increasing in cracks occurred at Egon Volcano was supported by the increase in the height of solfatara emission and the increase in SO2 gas content on January 2016, which was higher than the surrounding.Keywords: volcanic activity, volcanic earthquakes, b-value, increase of cracks

Penerapan Metode Permanent Scatterers Interferometry Synthetic Aperture Radar (PS-InSAR) untuk Analisis Deformasi Gunungapi (Studi Kasus : Gunungapi Sinabung) Sajidah Salsabil; Ira Mutiara Anjasmara; Estu Kriswati
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v8i2.44938

Di Indonesia terdapat 129 gunungapi yang masih aktif, salah satunya adalah Gunungapi Sinabung. Sepanjang tahun 2017 tercatat Gunungapi Sinabung mengalami erupsi-erupsi kecil akibat aktivitas magma. Pada gunungapi yang sedang aktif akan terjadi perubahan bentuk permukaan tanah yang disebut sebagai deformasi permukaan. Untuk memantau deformasi dapat digunakan berbagai macam metode, antara lain metode geodetik dengan menggunakan pengamatan GPS dan pengolahan data SAR dengan teknik PS-InSAR. Penelitian ini dilakukan untuk mengetahui deformasi yang terjadi pada gunungapi menggunakan metode PS-InSAR dengan validasi menggunakan data GPS. Data SAR yang digunakan, terdiri dari 27 citra Sentinel 1A tipe SLC dengan tanggal akuisisi 2 Januari hingga 28 Desember 2017. Hasil dari PS-InSAR menunjukkan line of sight (LOS) velocity rate yang terjadi berkisar pada -40,400 mm/tahun sampai dengan 30,800 mm/tahun dengan simpangan baku berkisar pada 1,400 mm/tahun sampai dengan 31,800 mm/tahun.

Mekanisme Gempa Vulkanik Gunung Talang Pasca Gempa Tektonik Mentawai Tahun 2007-2009, Sumatra Barat Estu Kriswati; Y. E. Pamitro; A. Basuki
Indonesian Journal on Geoscience Vol 5, No 3 (2010)
Publisher : Geological Agency

DOI: 10.17014/ijog.v5i3.104The Mentawai tectonic earthquake (magnitude 6.8 on the Richter Scale) on April 10, 2005 is assumed to trigger Talang volcanic activity that caused an eruption on April 12, 2005. Information on the source mechanism of volcanic earthquakes after the tectonic earthquake is expected to answer question of “Do tectonic earthquakes around the Talang Volcano trigger its volcanic activities?” Epicenter distribution of the volcanic earthquakes between 2007 and 2009 shows a southeast – northwest pattern with dextral strike-slip fault and normal fault mechanisms. The data show that earthquake activities at the Talang Volcano were dominated by local structure movements influenced by regional tectonic movements. Between 2007 and 2009, there were three process stages related to magnitude 6 or larger tectonic earthquakes around the Talang Volcano. First stage was a period before August 16, 2009. In this stage, volcanic fluids rose to the shallower chamber beneath the Talang Volcano. Second stage was a compressional stage and formation of a reverse fault influenced by Mentawai tectonic earthquake on August 16, 2009 and activation of a fault that intersects the Volcano. The third stage was a compresional stage and formation of a reverse fault influenced by Padang tectonic earthquake on September 30, 2009. In this stage, area fracturing was intensified, thereby the fracturing became more intensive. As the result, the accumulated volume and pressure of several tectonic earthquakes were released that caused an increase of eruption column soon after the tectonic earthquake.

Characteristic of Lokon Volcano Deformation of 2009 - 2011 Based on GPS Data Estu Kriswati; I. Meilano; Suhartaman Suhartaman; Y. Suparman; H. Z. Abidin; Tumpal Sinaga
Indonesian Journal on Geoscience Vol 7, No 4 (2012)
Publisher : Geological Agency

DOI: 10.17014/ijog.v7i4.147Precursor of Lokon Volcano eruptions in 2011 is believed to begin since December 2007 which was marked by increasing number of volcanic earthquakes and gas emission. To support this information, deformation method is used primarily to determine deformation characteristics of Lokon volcanic activity in the period of 2009-2011. The period of analysis is adapted to the presence of GPS data. Displacement rate of Lokon GPS observation points in the period of 2009 - 2011 ranged from 1.1 to 7 cm a year. Strain patterns that occur in the areas are compression surrounding Tompaluan crater and extension in the eastern slope. Location of the pressure source for August 2009 - March 2011 measurement was at a depth of 1800 m beneath Tompaluan crater. Deformation in the Lokon Volcano is characteristized by the compression zone in the summit and crater area caused by magma activity raised into the surface from a shallow magma source which is accompanied by a high release of volcanic gases. Accumulated pressure release and deformation rate as measured in the Lokon Volcano remain low.

Lava Discharge Rate of Sinabung Volcano Obtained from Modis Hot Spot Data Estu Kriswati; Akhmad Solikhin
Indonesian Journal on Geoscience Vol 7, No 3 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.3.241-252

DOI:10.17014/ijog.7.3.241-252To find out the long term data of Sinabung magma discharge rate and how long a series of eruption will be ended, time series of the volume of magma discharge is required. The dominant eruption product is pyroclastic flow that begins with the growth of the lava dome, so it is important to determine the volume of the lava dome over time. The method of determining the volume of magma issued is carried out by using hotspot data to resolve the problem of prevented visual observations and ground measurements. The heat and volume flux data expressed within a long period for a better view of variations in the Sinabung volcanic activity are based on thermal satellite data. Related lava dome volume and seismic data are also displayed to be compared with the heat and volume flux data. The numbers of thermally anomalous pixels and sum of radiance for all detected pixels at Sinabung during an overpass in the period of 2014 to 2018 have a downward trend. The discharge rates in the period of January 2014 to April 2015, Mei 2015 to March 2016, April 2016 to March 2017, and June 2017 to February 2018 are 0.86 m3/sec, 0.59 m3/sec, 0.36 m3/sec, and 0.25 m3/sec, respectively. Assuming no new intrusion or deformation rate changes, the lava discharge will be in the lowest rate in the early 2020s.

ANALISIS DEFORMASI GUNUNGAPI GEDE BERDASARKAN DATA PENGAMATAN GPS KONTINU 2017-2018 Abhie Adhiguna; Henri Kuncoro; Estu Kriswati
REKA GEOMATIKA Vol 2020, No 1
Publisher : Institut Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/jrg.v2020i1.3470

ABSTRAKGunungapi Gede berada di tiga wilayah Kabupaten, yaitu Kabupaten Bogor, Kabupaten Cianjur dan Kabupaten Sukabumi Jawa Barat. Gunungapi Gede ini memiliki ketinggian 2.985 meter di atas permukaan laut yang diklasifikasikan sebagai Gunungapi aktif tipe strato.Tercatat letusan pertama kali nya pada tahun 1747-1748 yang sangat hebat yang menyebabkan aliran lava yang terjadi sepanjang 2km dan letusan terakhir kali nya pada tahun 1957, namun ini bukan merupakan hal yang melegakan karena semakin lama suatu Gunungapi tidak aktif dan bila terjadi letusan, akan merupakan letusan yang sangat besar dan hebat (Katili, 1992). Penelitian ini bertujuan untuk menentukan berapa besar nilai Baseline Change Rate dari setiap Baseline yang dibentuk dati titik-titik pantau dan mengetahui gejala deformasi yang terjadi di Gunungapi Gede dengan menggunakan data pengamatan GPS tahun 2017-2018 yang berada di Gunungapi Gede yaitu CLDO, MKRJ, MKRW, PSBL dan PUTR. Hasil nilai perhitungan kecepatan perubahan jarak pada setiap Baseline memiliki nilai -0.00211±0.00379 strain/tahun sampai -0.04177±0.03303 strain/tahun, secara visualisai bersifat kompresi (perpendekan Baseline). Namun apabila Error Rate > Rate dapat dinyatakan Gunungapi Gede tidak mengalami deformasi dan di anggap diam, bahwa hal tersebut menunjukan masih dalam zona aman. Kata Kunci : Gunungapi Gede, Kecepatan Perubahan Jarak, Gejala Deformasi ABSTRACTGunungapi Gede is located in three regencies, namely Bogor Regency, Cianjur Regency and Sukabumi Regency, West Java. Gede Volcano has an altitude of 2,985 meters above sea level which is classified as a strato type active volcano. The first eruption was recorded in 1747-1748 which was very great which caused lava flow that occurred along 2km and the last eruption was in 1957, but this is not a relief because the longer a volcano is inactive and if an eruption occurs, it will is a very large and powerful eruption (Katili, 1992). This study aims to determine how much the Baseline Change Rate value of each Baseline formed from the monitoring points and find out the symptoms of deformation that occurred in Mount Gede by using GPS observation data for 2017-2018 located in Mount Gede, namely CLDO, MKRJ, MKRW , PSBL and PUTR. The results of the calculation of the speed of change in distance at each Baseline has a value of -0.00211 ± 0.00379 strains / year to -0.04177 ± 0.03303 strains / year, visualization is compression (short for Baseline). However, if the Error Rate> Rate can be stated Volcano Gede is not deformed and is considered silent, that it shows that it is still in a safe zone. Keywords : Mount Gede, Baseline Change Rate, Symptoms Of Deformation

Pengaruh Gempabumi Tektonik Terhadap Aktivitas G. Gede Sri Hidayati; Cecep Sulaeman; Supartoyo Supartoyo; Estu Kriswati
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i4.423

In addition to home for seven active volcanoes, West Java, is also having high tectonic activity, owing to its close distance from subduction zone and crustal fault. The Cimandiri Fault extends about 100 km from southwest to the northeast ward through Sukabumi area. Gede Volcano with high seismic activity is sitting 20 km north of Cimandiri Fault. Shallow earthquakes often occur around Gede volcano and their sources are fairly close to the Cimandiri valley. Feltearthquakes occurred in 2007, 2010, 2012 and 2014,where the source supposed to be around Cimandiri valley,were followed by volcano-tectonic (VT) earthquake swarms in Gede Volcano. These swarms probably indicate that there is a linkage between tectonic and Gede volcano activities. However, the swarms were followed by less significant changes in volcanic activity. GPS data during measurement period of 2006-2015 show the existence of a fault with main stress in the northwest-southeast direction. The mechanism of the Cimandiri Fault is reverse fault with sinistral slip component and sinistral strike slip fault, while the swarm of VT earthquakes in Gede Volcano is dominated by reverse and normal faults. Tectonic earthquakes may trigger nearby volcanic eruption; it depends on the state of magma of the volcano and the magnitude of the earthquake.Keyword: Tectonic, Cimandiri fault, VT earthquake, Gede Volcano.

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

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.

Erupsi Semeru 1 Desember 2020: Kronologi Kejadian Aliran Piroklastik, Kondisi Pre-Eruptif, dan Laju Ekstrusi Material Volkanik Banggur, Wilfridus F S; Nareswari, Ratika Benita; Saina, Nazirah; Astyka Pamumpuni; Mirzam Abdurrachman; Estu Kriswati; Liswanto; Mukdas Sofian; Yadi Yuliandi; Kristianto; Sofyan Primulyana; Idham Andri Kurniawan
Jurnal Geologi dan Sumberdaya Mineral Vol. 25 No. 3 (2024): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v25i3.796

Semeru merupakan gunungapi paling aktif di Jawa dengan tipe erupsi strombolian-vulkanian yang disertai pertumbuhan kubah lava. Erupsi eksplosif Semeru dapat menghasilkan guguran lava pijar dan runtuhan kubah lava yang disertai aliran piroklastik dengan jarak luncur mencapai 5-12 km ke arah selatan (Besuk Kembar dan Besuk Bang) atau tenggara (Besuk Kobokan) dari pusat erupsi. Pada 1 Desember 2020, terjadi aliran piroklastik dengan jarak luncur 11.5 km, yang merupakan jarak luncur terjauh sejak erupsi 2002. Rekonstruksi terhadap kronologi kejadian dan sebaran endapan aliran piroklastik 1 Desember 2020 secara detil dilakukan menggunakan data CCTV, press release, citra satelit, foto drone, portal berita, dan kanal media sosial. Kondisi pre-eruptif jangka pendek dikaji menggunakan citra satelit SAR Sentinel-1, Sentinel-2 dari MIROVA, dan frekuensi kegempaan. Algoritma MODVOLC digunakan untuk mengkaji laju ekstrusi produk material volkanik sebagai gambaran kondisi pre-eruptif jangka panjang. Rekonstruksi kejadian aliran piroklastik menunjukkan bahwa erupsi dimulai dengan guguran lava yang diikuti awan panas dengan beberapa perulangan dan kekuatan yang meningkat. Kondisi pre-eruptif sepanjang tahun 2020 menunjukkan perubahan morfologi bukaan kawah pusat, posisi titik runtuh guguran lava, serta posisi akumulasi material guguran di sekitar puncak yang menyebabkan arah luncuran aliran piroklastik lebih mengarah ke Besuk Kobokan. Sementara itu, peningkatan akumulasi volume dan laju ekstrusi material volkanik mengindikasikan kemungkinan peningkatan jarak luncuran ke depannya.

Volcanoes Segmentation at the Western Sunda Arc based on Satellite-derived Geological Lineaments and Land Surface Temperatures Rahmanto, Ridwan; Saepuloh, Asep; Kriswati, Estu; Purnamasari, Heruningtyas Desi
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.4

The Western Sunda Arc is an active tectonic zone formed by the subduction of the Indo-Australian Plate beneath the Eurasian Plate. The tectonic zone hosted for 83 active volcanoes, including Mts. Sinabung, Krakatau, Tangkuban Parahu, Merapi, and Semeru. The dense volcano concentration and high volcanic activity cause complexity in monitoring and observation processes. Segmenting volcanoes by location and tectonic setting is necessary to simplify the disaster monitoring and enhance mitigation efforts through focused observation areas. This study focuses on the segmentation of the volcanoes distributed at the Sunda Arc in Indonesia by analyzing the satellite-derived geological lineaments and land surface temperatures. The Sunda Arc is a complex volcanic chain that spans through Sumatra and Java Islands and lies in an active tectonic region. Remote sensing data and advanced geospatial techniques were used to examine geological lineament patterns and surface temperatures along the volcanic arc and the results were validated through fieldwork. Moreover, Shuttle Radar Topography Mission (SRTM) and Landsat 8 OLI/TIRS imagery were applied to achieve accurate lineament extraction and surface temperature anomaly detection. Lineament density was also computed through the modified Segment Tracing Algorithm (mSTA) to identify the fault zones and structural discontinuities in order to ensure better regional geological understanding. Subsequently, land surface temperature analysis was used to classify thermal anomalies and this led to the differentiation of natural volcanic sources from ground surfaces. These parameters were integrated to segment the volcanoes of the Sunda Arc into nine zones. Each zone was presented by average lineament density from 207.83 km/km2 to 166.06 km/km2, land surface temperature from 23.36 °C to 28.65 °C, angle of subduction slab from 22.871° to 38.007°, and lineament strikes from N 330° E to N 260° E. The zones were later discussed relative to the gradient of the Sunda Arc subduction slab as a form of contribution to the existing knowledge on geothermal dynamics, tectonic processes, and volcanic hazards beyond the region.

Co-Authors A. Basuki A. Basuki Abdurrachman, Mirzam Abhie Adhiguna Abidin, H. Z. Achmad Faris Adriansyah, David Akhmad Solikhin Asep Saepuloh Astyka Pamumpuni Banggur, Wilfridus F S Banggur, Willi FS Basuki, A. Cahya Patria, Cahya Cecep Sulaeman Cecep Sulaeman Devy K. Syahbana Dina Anggreni Sarsito Gede Suantika Gurasali, Aditya H. Z. Abidin H. Z. Abidin Henri Kuncoro Herman Yosef Mboro I. Meilano I. Meilano Idham Andri Kurniawan Ilham Mardikayanta Ira Mutiara Anjasmara irwan meilano Korompis, Richard Kristianto Kusnadi, Iing liswanto Meilano, I. Mirzam Abdurrachman Mukdas Sofian Nareswari, Ratika Benita Novia Antika Anggraeni Pamitro, Y. E. Praja, Kurnia Purnamasari, Heruningtyas Desi Rahmanto, Ridwan Saina, Nazirah Sajidah Salsabil Sentosa, Imam Shimomura, Makoto Sinaga, Tumpal Sofyan Primulyana Solikhin, Akhmad Sri Hidayati Sri Hidayati Sucahyo Adi Suhartaman Suhartaman Suhartaman Suhartaman Suhartaman, Suhartaman Suparman, Y. Supartoyo Supartoyo Supartoyo Supartoyo, Supartoyo Syahbana, Devy Kamil Tumpal Sinaga Tumpal Sinaga Wenas, Alfred Y. E. Pamitro Y. E. Pamitro Y. Suparman Y. Suparman Yadi Yuliandi

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