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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
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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Journal : indonesian journal on geoscience

 1 
Mekanisme Gempa Vulkanik Gunung Talang Pasca Gempa Tektonik Mentawai Tahun 2007-2009, Sumatra Barat Kriswati, Estu; Pamitro, Y. E.; Basuki, A.
Indonesian Journal on Geoscience Vol 5, No 3 (2010)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.3.209-218

Abstract

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 Kriswati, Estu; Meilano, I.; Suhartaman, Suhartaman; Suparman, Y.; Abidin, H. Z.; Sinaga, Tumpal
Indonesian Journal on Geoscience Vol 7, No 4 (2012)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.4.199-209

Abstract

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 Kriswati, Estu; Solikhin, Akhmad
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

Abstract

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.
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