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All Journal JGE (Jurnal Geofisika Eksplorasi) Journal of Science and Applicative Technology Jurnal Meteorologi Klimatologi dan Geofisika Journal of Multidisciplinary Academic Makara Journal of Science
Suhendi, Cahli
Geophysical Engineering, Department Of Industrial Technology, Institut Teknologi Sumatera, South Lampung, Indonesia
Astronomy Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences

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ANALISIS PERGERAKAN DAN AKUMULASI COULOMB STRESS GEMPA UTAMA LOMBOK SELAMA TAHUN 2018 DAN PENGARUHNYA TERHADAP AKTIVITAS GUNUNG RINJANI Lasroha Marulitua Panjaitan; Erlangga Ibrahim Fattah; Cahli Suhendi; Rizki Wulandari; Hana Yudi Perkasa
Jurnal Meteorologi Klimatologi dan Geofisika Vol 7 No 1 (2020): Jurnal Meteorologi Klimatologi dan Geofisika
Publisher : Unit Penelitian dan Pengabdian Masyarakat Sekolah Tinggi Meteorologi Klimatologi dan Geofisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36754/jmkg.v7i1.215

Abstract

Mechanically, earthquakes can be triggered by changes in static and dynamic stress. In terms of static stress change, it occurs when earthquake energy is released which then changes the stress conditions around the fault (for example at the end of the fault). The process of changing static stress in an area will cause seismic activity to occur in the surrounding area and in other areas with a great distance. The amount of change in Coulomb Failure stress (∆CFS) is quantifiable and has proven to be a powerful tool in explaining the movement and accumulation of stress caused by the mainshock and its aftershock. This study was conducted to calculate the distribution of stress changes due to the main Lombok earthquake (Mw≥6) during 2018 and its effect on Mount Rinjani activity, using the Coulomb 3.3 software. The earthquake data used were taken from the earthquake catalog of Global Centroid Moment Tensor (GCMT), International Seismological Center (ISC) and United States Geological Survey (USGS). The lateral difference in the value of ∆CFS shows the movement of energy from the main earthquake that triggered another earthquake as shown by the aftershock data. The results of this analysis of the movement and accumulation of ∆CFS will be used to identify the correlation with the activity of Mount Rinjani.
ALTERNATIF PEMODELAN NUMERIK KOPEL THERMO-HYDRO -MECHANIC INJEKSI CO2 PADA FORMASI GEOLOGI BAWAH PERMUKAAN Cahli Suhendi; Mohammad Rachmat Sule
Jurnal Geofisika Eksplorasi Vol 6, No 1 (2020)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v6i1.62

Abstract

CO2 injection into subsurface formations is a potential method to reduce CO2 gas emissions in the atmosphere. Geological and geophysical studies are carried out as an effort to analyze the storage capacity and potential risks. The results are then used to analyze the response of reservoir rock to the injected CO2 fluid. The effect of fluid injection on reservoir rocks is complex and involves a coupled system of fluid flow-geomechanics. CO2 fluid injection can increase fluid pressure that affects the local stress conditions of reservoir and surrounding rock. Meanwhile, changes in temperature due to the presence of CO2 fluid also affect reservoir rock stress, although not significantly. The complexity of the subsurface reservoir system includes thermomechanical and hydromechanical analysis involving multi-phase and multi-component fluids. To study these complex interactions, a program which can simulate the coupling between multi-phase and multi-component fluid-flows-geomechanics is needed. To accommodate these needs, Rutqvist et al (2002) have proposed a numerical modeling approach by linking TOUGH2-ECO2N and FLAC3D. In this study we developed an external program that linking TOUGH2 with different fluid modul (ECO2M), and FLAC3D using these approaches to run the coupled THM simulation automatically and seamlessly until the end of simulation.
Lithology Identification Using Electrical Resistivity Tomography Case Study: OAL’s Construction Site Erlangga Ibrahim F.; Andri Yadi Paembonan; Cahli Suhendi; Hikhmadhan Gultaf; Virgian Rahmanda; Lea Kristi Agustina; Hendra Saputra; Maria R.P. Sudibyo; Reza Rizki
Journal of Multidisciplinary Academic Vol 3, No 2 (2019): Special Issue in Multidisciplinary Academics related Astronomy Background
Publisher : Penerbit Kemala Indonesia

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Abstract

Observatory Astronomy Lampung construction site is located at Mountain Betung, North – West of Lampung City. From geomorphology investigation, Mount Betung landscaped classified as volcanic mountain with pyroclastic flow mountaincharacteristics. Geological setting of this area showed those dominant lithology is pyroclastic, including andesite and breccia rocks. These feature correlate with our investigation around OAL construction site. We applied electrical resistivity tomography to investigate subsurface soil electrical properties. The result indicated that there are two different lithology, high resistivity in the top soil and low resistivity below. High resistivity suspected as pyroclastic deposit with a lot of volcanic rocks fragment, whereas the low resistivity suspect as volcanic deposit with high – saturated water, which indicated as clay
Ambient Noise-Based Mapping of Bedrock Morphology and Potential Fissure Zone in East Tanjung Karang, Bandar Lampung, Lampung, Indonesia Ipmawan, Vico Luthfi; Permanasari, Ikah Ning Prasetiowati; Suhendi, Cahli
Makara Journal of Science Vol. 25, No. 2
Publisher : UI Scholars Hub

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Abstract

As a business center and the most populous subdistrict, East Tanjung Karang in Bandar Lampung, Lampung, Indonesia, is considered an area with excessive groundwater exploitation. This activity can trigger ground fissures that can consequently cause damage to buildings and roads. In this study, microtremor recordings from 17 sites were collected and analyzed by using the horizontal to vertical spectral ratio and ellipticity curve method. Results showed that the ground profiles of shear wave velocity from 17 sites ranged from 143.5 m/s to 1752.46 m/s, and they could be used to determine sediment layer and its thickness based on the SNI 1726-2012 criteria. The thickness of the bedrock varied from 8.18 m to 117.18 m. Bedrock morphology was obtained by subtracting the sediment thickness from the altitude value. The bedrock morphology and slope were then used to construct a potential fissure map of the area between Y16 and Y17 and between Y26 and Y27, which had high bedrock slopes (more than 45°). The ground fissure potential in these areas was higher than that in other areas. Such areas also had a geological hazard potential from ground fissures caused by excessive groundwater exploitation. Our study could be used by authorities as a basis for preventing subsidence-related disasters in this subdistrict.
Preliminary Result: Identification of Landslides using Electrical Resistivity Tomography Case Study Mt. Betung Erlangga Ibrahim; Hikhmadhan Gultaf; Hendra Saputra; Lea Kristi Agustina; Virgian Rahmanda; Cahli Suhendi; M. R. P. Sudibyo; Reza Rizki
Journal of Science and Applicative Technology Vol 2 No 1 (2019): ICoSITeR Special Edition
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (451.66 KB) | DOI: 10.35472/281455

Abstract

Institut Teknologi Sumatera (ITERA), ITB and local governments had been cooperated in establishing an astronomy observatory of ITERA Lampung (OAIL), which was located at Mt. Betung in the Pasawaran area. Geological setting of this area showed that the dominant lithology of Mt. Betung is pyroclastic, andesite, and breccia rocks. These volcanic deposits have the potential to move the materials down-slope by the force of gravity, steep slope, and high water-content. We have investigated some area with the potential of a landslide along OAIL construction area, which may be the cause of the landslip as well. We applied electrical resistivity tomography to analyse the electrical properties of the subsurface soil and determine the vulnerable area of the landslide. The result indicated that the area is divided into high resistivity at the top of the soil and low resistivity below. These high resistivity numbers are caused by pyroclastic flow while the lower one is caused by fracture-filled, mostly with water and clay.
Identifikasi Struktur Geologi dan Petrografi di sekitar Observatorium Astronomi Lampung Gunung Betung Hendra Saputra; Luhut P. Siringorongo; Cahli Suhendi; Lea Kristi Agustina
Journal of Science and Applicative Technology Vol 4 No 2 (2020): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v4i2.265

Abstract

Lampung Astronomical Observatory (LAO) is located on Betung Mountain which is quite close to the Semangko active fault zone. Betung Mountain is part of the Bukit Barisan which is located west of the city of Bandar Lampung. This mountain has an altitude of about 1200 meters above sea level. There are 6 interesting stations. Most of the stations are located on the upper slopes of Betung Mountain. In the Talang Aji area, there are 2 springs. The other 4 stations consist of waterfalls with varying heights: Talang Teluk waterfall (30 m), Talang Rabun waterfall (20 m), Betung waterfall consists of two minor terraced waterfalls with a height of 5 and 10 m respectively, and Kubu Jambu waterfall (12 m). In general, the orientation of the faults of Mt. Betung was northeast-southwest. The faults are also associated with several waterfalls found in the field. From the joint data processing, it can be interpreted that the fault formed on Betung Mountain is normal. The lithology of Betung Mountain is dominated by volcanic deposits in the form of tuffs. In certain rivers, there are outcrops of lava igneous rock in the form of Andesites. Andesite lava in the northern and southern parts of Betung Mountain has different characteristics.
Co-Authors Andri Yadi Paembonan Erlangga Ibrahim Erlangga Ibrahim F. Erlangga Ibrahim Fattah Hana Yudi Perkasa Hendra Saputra Hendra Saputra Hendra Saputra Hikhmadhan Gultaf Hikhmadhan Gultaf I. N. P. Permanasari Lasroha Marulitua Panjaitan Lea Kristi Agustina Luhut P. Siringorongo M. R. P. Sudibyo Maria R.P. Sudibyo Mohammad Rachmat Sule Reza Rizki Rizki Wulandari Vico Luthfi Ipmawan Virgian Rahmanda Virgian Rahmanda