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All Journal Natural B JGE (Jurnal Geofisika Eksplorasi) Journal of Geoscience, Engineering, Environment, and Technology Journal of Science and Applicative Technology Journal of Multidisciplinary Academic Jurnal Fisika Indonesia Jurnal Geosaintek
Reza Rizki
Geophysical Engineering, Department Of Industrial Technology, Institut Teknologi Sumatera, South Lampung, Indonesia
Astronomy Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Estimation Microporosity Value of Fontanebleau Sandstone Using Digital Rock Physics Approach Reza Rizki; Handoyo Handoyo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 2 (2018): JGEET Vol 03 No 02 : June (2018)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (502.29 KB) | DOI: 10.24273/jgeet.2018.3.2.1544

Abstract

The technology of digital rock physics (DRP) allowed to predict the physical properties in core data sample, for example to predict value of porosity of data sample. This research applied the digital rock physics technique to predict the microporosity in sandstone sample: Fontanebleau Sandstone. The data are digital images from Fontanebleau Sandstone with high resolution scanned from micro tomography CT-Scan processing. The result of image processing shown in 2D and 3D image. From the data, the value of microporosity Fontanebleau Sandstone are beetwen 6% - 7%. This result confirmed by the quartz cemented sample of Fontanebleau Sandstone. The scale and sub-cube give the different value of microporosity which is indicated the scale influence to value of porosity value. So the simplest and best way is to average the all result from sub-cubes.
Hydrogeochemical and Groundwater Assessment for Drinking Purpose at ITERA Campus Area and Its Surroundings Luhut Pardamean Siringoringo; Reza Rizki; Janner Nababan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 1 (2019): JGEET Vol 04 No 01 : March (2019)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1121.204 KB) | DOI: 10.25299/jgeet.2019.4.1.2478

Abstract

Groundwater research for drinking purpose was very important to be done at ITERA campus and its surroundings. It is caused the area is very close to social activities, especially for students. The hydrogeochemical analysis was done with integrating Piper diagram plotting result, X-Y plotting result for some cations and anions, and Gibbs diagram plotting result. Groundwater assessment for drinking purpose referred to Peraturan Menteri Kesehatan Republik Indonesia No. 492/MENKES/PER/IV/2010. There were 14 samples that were taken from nine dig wells and five drill wells. The groundwater facieses were dominated by Facies Na-HCO3-Cl (35,71%) followed by Facies Na-Cl (21,43%), Facies Na-HCO3 (21,43%), Facies Na-SO4-Cl (14,29%), dan Facies Ca-Mg-HCO3 (7,14%). Generally, Groundwater hydrogeochemical of research area shows that groundwater chemistries are controlled by minerals weathering, evaporation, and precipitation. There are eight wells that not proper for drinking and six wells that proper for drinking. Integration lab result, stratigraphic analysis, and depth aquifer show that groundwater that proper for drinking comes from confined aquifer while that not proper for drinking comes from unconfined aquifer
Microtremor Assessment to Investigate the Local Site Response and the Depth of Weathering Rock at Institut Teknologi Sumatera Campus Area Maria Rosalita Pujiastuti Sudibyo; Erlangga I. Fattah; Cahil Suhendi; Reza Rizki
Natural B, Journal of Health and Environmental Sciences Vol 5, No 2 (2019)
Publisher : Natural B, Journal of Health and Environmental Sciences

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Abstract

Local site effects related to the local geology can influence the damage of earthquake, by amplifying or deamplifying the horizontal movement of ground motion. To characterize the site effects in a local area, the natural frequency and the amplification factors can be estimated by performing Horizontal-to-Spectral Ratio on microtremor data. The amplification factors and natural frequency obtained then can be used to estimate the seismic vulnerability and the depth of the bedrock. This method is applied by recording the microtremor data in 1.5x1.5 km2 ITERA campus area, deploying 11 points of measurements. The recording of 45 to 60 minutes long for each point has been done to accommodate the lowest possible natural frequency we may obtain. The HVSR estimation shows that there are two predominant frequency, F0 and F1, ranging from 0.7 to 1.31 Hz and 3.88 to 8,71 Hz. These two dominant frequencies are associated with two layers of tuff, a soft weathered laying on a thicker and stiffer tuff rock layer. The amplification factors Ao are varied from 2.5 to 9 and is considered as the low bound of the real amplification factor. The depth of the soft weathered tuff is estimated ranging from 8 to 18 m. The seismic vulnerability estimated from this research is ranged from 7 to 65, implying that the area has mid-level of vulnerability.
SUBSURFACE SURVEY OF CISARUA LAMPUNG HOT SPRINGS USING GEOCHEMICAL AND GRADIO-MAGNETIC METHOD Reza Rizki; Wijayanti Ashuri; Rendra Aditya Hakim; Nono Agus Santoso
Jurnal Geofisika Eksplorasi Vol 8, No 1 (2022)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v8i1.176

Abstract

The subsurface survey was carried out in Cisarua Hot Springs, South Lampung. Cisarua Hot Springs has a neutral pH and a temperature of about 44 °C. A combination of geochemical and gradio-magnetic methods was used in this research. This research identifies the characteristics of the Cisarua Hot Springs, estimates reservoir temperature, and creates a subsurface model to determine the hot fluid distribution in the study area. According to the geological data, the manifestation of these hot springs correlates with the Lampung-Panjang Fault. The geochemical results show that this type of hot springs fluid is bicarbonate water, and the reservoir temperature is estimated to be around 160 °C. The low gradio-magnetic anomaly is correlated with the distribution of subsurface hot water flow, according to the 3D model of the gradio-magnetic method. The distribution of subsurface hot fluids is in the middle to the eastern part of the research area.
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
Aplikasi Metode Ground Penetrating Radar untuk Mengidentifikasi Fasies Batugamping Formasi Rajamandala Di Daerah Cikamuning, Jawa Barat Reza Rizki
Jurnal Fisika Indonesia Vol 22, No 2 (2018)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v22i2.32628

Abstract

Formasi Rajamandala tersingkap luas di daerah Padalarang, Jawa Barat, mulai dari daerah Cikamuning (Tagogapu) di bagian timur sampai Saguling di bagian barat. Batugamping dari formasi ini dibagi menjadi dua satuan batuan yaitu anggota batugamping dan anggota lempung dan napal. Formasi ini terbentuk pada Oligosen Akhir sampai Miosen Awal. Penelitian dilakukan di daerah Cikamuning, Padalarang, Jawa Barat dengan menggunakan metode ground penetrating radar (GPR). Penelitian ini meliputi pengambilan (akuisisi) data GPR, pengolahan data GPR dengan menggunakan software ReflexW, dan menginterpretasi data lapangan dengan mengikat data bor ITB-1. Frekuensi alat yang digunakan adalah 75 MHz, penggunaan frekuensi ini memberikan kemampuan resolusi yang cukup baik dengan jangkauan kedalaman yang memenuhi target. Pengolahan data GPR dilakukan dengan tahapan dewow, AGC, energy decay, background removal, bandpass frequency, autocorrelation, deconvolution, stack trace, kirchoff migration, FK-filter, dan static correction. Data yang sudah diproses kemudian diinterpretasi untuk mengetahui kondisi geologi bawah permukaan serta penyebaran fasies batugamping daerah penelitian.
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.
PEMETAAN KERENTANAN SEISMIK MELALUI ANALISIS MIKROTREMOR HVSR DI WILAYAH KECAMATAN KEMILING DAN SEKITARNYA Ariyanto, Agus; Farduwin, Alhada; Styawan, Yudha; Putri, Intan Andriani; Junian, Wahyu Eko; Prasetyo, Nugroho; Rizki, Reza; Wulandari, Rizki
JGE (Jurnal Geofisika Eksplorasi) Vol 10, No 2 (2024)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v10i2.393

Abstract

Wilayah Kemiling yang terletak di Kota Bandar Lampung sering kali mengalami gempa lokal dengan magnitudo kecil. Gempa ini terjadi secara berulang dan dirasakan di daerah Kemiling dan sekitarnya. Hal tersebut dapat menimbulkan kekhawatiran bagi warga dan dapat merusak bangunan. Fokus utama pada studi ini adalah untuk memahami bagaimana karakteristik tanah dan indeks kerentanan seismik di daerah tersebut. Untuk meminimalisir dampak kerusakan akibat gempa, perlu dilakukan mikrozonasi pada wilayah rawan gempa. Parameter mikrozonasi yang digunakan untuk mengetahui karakteristik tanah antara lain amplifikasi (A0), frekuensi natural (f0), indeks kerentanan seismik (Kg), periode dominan (T0), dan kecepatan gelombang geser hingga kedalaman 30 meter (VS30). Sebanyak 65 titik pengukuran mikrotremor telah diukur di Kecamatan Kemiling dan sekitarnya meliputi kota Bandar Lampung, Kecamatan Gedong Tataan, dan Kecamatan Natar. Pada penelitian ini digunakan analisis metode Horizontal to Vertical Spectral Ratio (HVSR) dan didapatkan bahwa frekuensi natural berkisar antara 0,5-31,47 Hz, periode dominan 0,03-2,0 sekon, amplifikasi 0,76-7,67 kali penguatan, indeks kerentanan seismik 0,05-76,31, dan VS30 49,61-777,80 m/s. Hasil penelitian menunjukkan bahwa wilayah barat daya hingga utara Kemiling memiliki risiko kerentanan yang lebih tinggi dibandingkan wilayah lainnya dengan tipe tanah berupa tanah lunak. Oleh karena itu, diperlukan tindakan mitigasi yang tepat, termasuk pengembangan rencana mitigasi risiko, pemantauan lanjutan, dan keterlibatan aktif masyarakat dalam perencanaan darurat.
APLIKASI METODE FLAT BASE ELECTRICAL RESISTIVITY SURVEY UNTUK MENGETAHUI KERUSAKAN DI JALAN TERUSAN RYACUDU LAMPUNG SELATAN Putra, Felik Destian; Paembonan, Andri Yadi; Rizki, Reza
Jurnal Geosaintek Vol. 6 No. 3 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Telah dilakukan penelitian pada Jalan Raya Terusan Ryacudu Lampung Selatan menggunakan data Flat Base Electrical Resistivity Survey dengan tujuan untuk mengetahui faktor penyebab kerusakan jalan yang terjadi di lokasi tersebut. Jalan Terusan Ryacudu merupakan akses keluar masuknya kendaraan yang menghubungkan kota Bandar Lampung dengan pintu masuk tol ITERA-Kotabaru yang ditemukan banyak titik kerusakan pada permukaan aspal yang dapat memicu munculnya permasalahan di lokasi tersebut. Berdasarkan penampang 2D pada daerah penelitian ini memiliki persebaran nilai resistivitas yang relatif tinggi antara 1000-5000 Ohm.m dan didominasi oleh nilai resistivitas dari lapisan batuan tufa yang merupakan batuan yang mendominasi lokasi penelitian ini namun di beberapa titik ditemukan adanya sebaran nilai resistivitas yang cenderung lebih rendah yang diakibatkan oleh adanya proses pemadatan material yang kurang sempurna saat proses pembuatan jalan. Pada penampang 2D resistivitas di lokasi ini juga ditemukan adanya sebaran nilai resistivitas yang cukup rendah dengan nilai 16-80 Ohm.m yang diindikasikan sebagai batuan tufa yang proses pemadatannya tidak sempurna dan mengalami infiltrasi oleh adanya air yang letaknya berada di bawah titik yang mengalami kerusakan berupa lubang di permukaan aspal. Secara umum kerusakan yang muncul pada lokasi ini diakibatkan oleh adanya proses pemadatan material jalan yang tidak sempurna dan adanya proses infiltrasi oleh air terutama air hujan.
MULTIMETHOD APPROACH TO THE STUDY OF SUBSURFACE IN MERAK BATIN HOT SPRING, NATAR, LAMPUNG Santoso, Nono Agus; Junian, Wahyu Eko; Ramayanti, Fitria; Rizki, Reza; Alawiyah, Susanti
Jurnal Geosaintek Vol. 11 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i1.3023

Abstract

Merak Batin Natar hot spring is a geothermal manifestation located far (16 km) from the nearest volcanic edifice and thus is of local scientific interest. The driver of this hot spring has never studied in detail, and whether this system links to the distant volcanic body is an open question. The purpose of this study was to obtain a subsurface model of the Natar hot spring. The method used is a combination of magnetic, geoelectric and geochemical methods. Based on the results of the study, it was found that the subsurface model of the Natar hot spring consists of an unaltered and altered zone. This hot spring belongs to the outflow zone, so it is natural to be in the lowlands and far from the volcano.
Co-Authors Agus Ariyanto Andri Yadi Paembonan Cahil Suhendi Erlangga I. Fattah Erlangga Ibrahim Erlangga Ibrahim F. Farduwin, Alhada Handoyo Handoyo Hendra Saputra Hendra Saputra Hikhmadhan Gultaf Hikhmadhan Gultaf Janner Nababan Junian, Wahyu Eko Lea Kristi Agustina Luhut Pardamean Siringoringo M. R. P. Sudibyo Maria R.P. Sudibyo Maria Rosalita Pujiastuti Sudibyo Prasetyo, Nugroho Putra, Felik Destian Putri, Intan Andriani Ramayanti, Fitria Rendra Aditya Hakim Rizki Wulandari Santoso, Nono Agus Suhendi, Cahli Susanti Alawiyah Virgian Rahmanda Virgian Rahmanda Wijayanti Ashuri Yudha Styawan