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All Journal JGE (Jurnal Geofisika Eksplorasi) Journal of Engineering and Scientific Research (JESR) Journal of Innovation and Technology
Akroma Hidayatika
Department Of Geophysical Engineering, Faculty Of Engineering, Universitas Lampung
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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APLIKASI METODE GEOLISTRIK RESISTIVITAS UNTUK ANALISIS BIDANG GELINCIR DAN STUDI KARAKTERISTIK LONGSORAN DI JALAN RAYA SUBAN BANDAR LAMPUNG Rahmi Mulyasari; IG Boy Darmawan; Dersan Surya Effendi; Sugeng Purwo Saputro; Hesti Hesti; Akroma Hidayatika; Nandi Haerudin
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.v6i1.61

Abstract

Pidada Urban Village, Panjang District, Bandar Lampung is an area that has medium to high landslide potential. One of landslides prone area triggered by rain located on Jalan Raya Suban. The slip surface areas under water-saturated soil is one of causes of landslides triggered by rain. Geophysical method used to detect slip surface is 2D Resistivity Method of Wenner-Schlumberger Configuration. In this study, an analysis of the slip surface has been carried out with the 2D resistivity method of the Wenner-Schlumberger Configuration and determination characteristic of landslide on Jalan Raya Suban. Based on the results of study indicated that the subsurface lithology consists of layers of tuff sediment, sandy clay and breccia. The slip surface is estimated at the boundary the layers of tuff sediment layer and sandy clay with depth (5-15) meters from the ground surface. The results of analysis and observation showed that type of landslide is translational fine-grained soil. Types of slope reinforcement that can be applied are civil and vegetative techniques.
ANALISIS KARAKTERISTIK LAPISAN SEDIMEN BERDASARKAN DATA MIKROTREMOR DI AREA RUMAH SAKIT PENDIDIKAN UNILA Hesti Hesti; Suharno Suharno; Rahmi Mulyasari; Akroma Hidayatika
Jurnal Geofisika Eksplorasi Vol 7, No 2 (2021)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v7i2.123

Abstract

Provinsi Lampung memiliki kondisi geografis kompleks,  dilewati jalur bukit Bukit barisan Barisan dan terletak diantara dua lempeng yaitu Indo-Australia dan Eurasia. Provinsi Lampung juga  merupakan wilayah yang dekat  dengan Samudera Hindia dan terletak pada zona Sesar Semangko (Sumatra Transform Fault Zone) yang terbentang dari Aceh sampai Teluk Semangka Lampung. Dengan demikian penataan wilayah dan pembangunan infrastruktur yang berbasis mitigasi gempabumi merupakan hal yang sangat penting dilakukan. Tujuan penelitian ini adalah mengetahui karakteristik lapisan batuan sedimen pada area pembangunan Rumah Sakit Pendidikan Universitas Lampung (RSP Unila) sebagai bagian dari tahapan mitigasi bencana gempabumi.  Penelitian ini dilakukan dengan menggunakan metode mikrotremor dan analisis geologi permukaan. Data pengukuran metode mikrotremor dianalisis dengan menggunakan metode analisis Horizontal Vertical Spectrum Ratio (HVSR) untuk mendapakan nilai amplifikasi (A0) dan frekuensi dominan (f0).Hasil dari analisis HVSR diperoleh nilai frekuensi dominan (f0) berkisar 0.65–1.2 Hz, amplifikasi (A0) berkisar 3.33–5.62, dan nilai periode dominan (T0) 0.6–1.5 sekon. Nilai A0, f0, T0 diinterpreasikan dengan mengacu data literatur dan geologi permukaan yang relevan. Hasilnya menunjukkan bahwa daerah penelitian memiliki jenis lapisan sedimen yang rentan terhadap peristiwa gempabumi.
INTERPRETASI GEOFISIKA BIDANG GELINCIR PALEO-ROCKSLIDE PARANGTRITIS Akroma Hidayatika; Suharno Suharno; Rahmi Mulyasari; Hesti Hesti; Bella Restu Juliarka
Jurnal Geofisika Eksplorasi Vol 6, No 2 (2020)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v6i2.75

Abstract

Parangtritis has a rock fall hazard area with a medium to high level of risk. In Parangtritis, there was a large scale paleo-rockslide that involved more than 800 million m3 of rock mass with an area of 1500 m x 2700 m. This is a significant factor in changing the landscape. This research uses 9 Audio-MagnetoTelluric (AMT) primary data points. Using the distance between points 750 m within a 2 km x 2 km study area. The location focused on the western side of the paleo-landslide area in Parangtritis Village. Processing AMT data using the help of MT-INV and RockWorks software. The result of one-dimensional inversion consists of 3 layers. Indicates a low resistivity value (0-10 Ωm) interpreted as beach deposition and sand dune, medium resistivity (50 - 160 Ωm) for Wonosari limestone and high resistivity ( 170 Ωm) for Nglanggran andesite breccias. The average thickness of the first layer is 44 m and the second layer reaches 175 m. Based on the resistivity structure of the AMT data, the interpretation of the boundary contact between the Wonosari limestone and the Nglanggran andesite breccia can act as a slip field in a depth of about 250 m This field is a passive fault field controlled by the Girijati fault in the east of the study area.
Estimation of Potential Gold Mineral (Au) with A Resistivity Approach Akroma Hidayatika; Arif P Prabowo; Syamsurijal Rasimeng; Medi K Putri; Suharno
Jurnal Inovasi Teknologi Vol 2 No 2 (2021): October
Publisher : Engineering Forum of Western Indonesian Government Universities Board (Forum Teknik, BKS-PTN Wilayah Barat) Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31629/jit.v2i2.4254

Abstract

This research was conducted in Pesisir Barat Regency. This study aims to calculate the estimated potential gold mineral content Gold is formed as a result of the residual solution of magma being uplifted and deposited at high temperatures and pressures. The gold mineral in this area is a ) low sulphidation hydrothermal gold deposit epithermal type (in the form of quartz veins, with carrier minerals containing metals and non-metals. This research uses resistivity method. Interpretation is done by analyzing the resistivity 2D cross section. The interpretation of the gold mineralization zone is associated with the source rock (volcanic) which has a resistivity value of 500Ω.m. Based on resistivity modeling, assuming the source rock is an andesitic-basaltic igneous rock with a density of 2.8 g/cm3 and a maximum depth of 30 meters, it is estimated that the mineral content (Au) in this research location is in the range of (0,3 – 1,5) tons.
The Initiation Study on the Gold Potential Resources at West Coast Area in Lampung Province, Indonesia Akroma Hidayatika; Suharno; Rahmi Mulyasari; Hesti; Idabagus S Yogi; Arif P Prabowo; Syamsurijal Rasimeng
Journal of Engineering and Scientific Research Vol. 4 No. 1 (2022)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.216 KB) | DOI: 10.23960/jesr.v4i1.97

Abstract

Gold mineral (Au) is formed due to an increase in the residual solution of magma deposited at high temperature and pressure. This study aims to estimate the potential of gold minerals in the west coast area in Lampung Province. This initiation study was using a geophysical resistivity model. Based on geological data, gold minerals in the West Coast are classified as epithermal hydrothermal deposits in the form of low sulfide quartz veins. The results of the subsurface interpretation were identified as a gold mineralization zone associated with the rock in the form of volcanic rock which has a resistivity value of 400?.m. The source rock volume has been estimated at 130,000 m3 and ?133,000 m3. So that the Au mineral content in the study area is estimated at 0.5-2.09 tons. A future study should be conducted in relation to the development of gold mining industry in Lampung West Coast area, that may integrate more engineering experts.
Co-Authors Arif P Prabowo Arif P Prabowo Darmawan, I Gede Boy Dersan Surya Effendi Hesti Hesti Idabagus S Yogi Juliarka, Bella Restu Medi K Putri Nandi Haerudin Rahmi Mulyasari Sugeng Purwo Saputro Suharno Suharno Suharno Syamsurijal Rasimeng