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Yatini, Y
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Delineation of Nickel Laterite Deposits in "DCV" Block Southeast Sulawesi Based on Data Analysis of Ground Penetrating Radar (GPR) Method Yatini, Y; Getsimany, Chrismast
Jambura Geoscience Review Vol 6, No 1 (2024): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v6i1.21119

Abstract

The need for nickel is very intensive in the development of upstream to downstream industries so that domestic consumption of nickel ore will increase in the coming years, therefore domestic downstream is increasingly being improved. Overcoming the problem of the high demand for nickel in Indonesia can be done by conducting exploration and exploitation to support the downstream of nickel. Exploration of nickel laterite can be accomplished with geophysical methods that aim to obtain subsurface data from nickel laterite deposits. The Ground Penetrating Radar (GPR) geophysical method is one of the non-destructive methods that can be applied to determine the subsurface conditions of nickel laterite deposits based on physical properties in the form of dielectric constants and reflection patterns and amplitude contrasts produced on radargrams. The nickel laterite deposits can be separated into 4 layers based on Ground Penetrating Radar (GPR) data analysis: bedrock, saprolite, limonite, and topsoil. Based on GPR measurements, the average dielectric constant value of topsoil is 6.8 mS/m, the limonite layer is 10.87 mS/m, the saprolite layer is 12.37 mS/m, and bedrock is 7.87 mS/m. It can be seen that the saprolite layer has a high conductivity so that the dielectric constant value is also high, this is influenced by the very high nickel content in this layer. The depth of bedrock in the research area varies from 20 - 40 meters, the thickness of topsoil is dominated in the value range of 3.6 - 5 meters, while the thickness of the laterite layer which is the main target of nickel laterite mining includes saprolite and limonite layers which have varying values of 15 - 40 meters where the distribution of the thickness of this layer is in the eastern and central parts of the research area.
An APPLICATION OF SURFACE CONSISTENT AMPLITUDE CORRECTION (SCAC) IN THE "HRNR" FIELD Yatini, Y; Nur Rohman, Hafid Rizki
Indonesian Applied Physics Letters Vol. 5 No. 1 (2024): Indonesian Applied Physics Letters - June 2024
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/iapl.v4i2.49910

Abstract

This research aims to enhance the quality of 3D onshore seismic data and understand subsurface structures in a study area. We implemented the Surface Consistent Amplitude Correction (SCAC) method in seismic data processing. This study's results demonstrate that using SCAC significantly improves the quality of seismic data amplitudes, especially in eliminating previously disruptive noise in the analysis. Following the application of SCAC, seismic data amplitudes become clearer and stronger. The interpretation of the enhanced seismic data with SCAC revealed the presence of a significant geological structure, namely a reverse fault, which has significant implications for subsurface understanding. The location of this reverse fault was identified at inline 190 within the CMP range of 60 to 120, with time domain depths ranging from 150 ms to 1250 ms in the southwestern part of the cross-section. This research highlights that SCAC plays a key role in enhancing seismic data resolution and enables the identification of reverse faults that were previously challenging to discern. These findings make a crucial contribution to understanding subsurface geology in the study area and hold significant potential in the context of natural resource exploration. This study firmly establishes that SCAC is an effective tool in improving seismic data quality and revealing important geological structures, especially reverse faults, which can be a primary focus in subsurface geological studies in this research area.
APLIKASI METODE INDUCED POLARIZATION (IP) UNTUK MENGIDENTIFIKASI PENYEBARAN MINERAL LOGAM DI DAERAH LEON Nugraheni, Elleona Septi; Yatini, Y; Santoso, Agus
Indonesian Mining Journal Vol 26 No 2 (2023): Indonesian Mining Journal, October 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol26.No2.2023.1344

Abstract

The research was conducted in the Leon area to determine the presence and quantity of metallic mineral resources. The stratigraphy of the study area is composed of alluvium and coastal deposits, Molasa Sarasin Formation, Tinombo Formation, and Intrusion. Exploration was carried out in the Leon area using Induced Polarization Method with a dipole-dipole configuration with an area of ​​950 m2. The length of the track is 580 meters with a North-South orientation. The number of tracks in this study was 15, with spacing electrodes as far as 20 meters and n = 1-10. The analysis showed that the distribution of resistivity values ​​in the study area was from (13.6 to 1337) Ωm, while the chargeability values ​​had a range of values ​​(1.7 to 50.6) ms. The low resistivity values ​​below 50 Ωm are interpreted as claystone to sandstone and the medium resistivity values ​​between 50 Ωm - 500 Ωm are interpreted as compact sandstone to breccia. The resistivity values ​​above 500 Ωm are interpreted as igneous rock. The presence of metallic minerals in the study area is characterized by changeability values ​​above 22 ms in claystone, sandstone, breccia, and igneous rock. Calculating hypothetical resources was conducted the Block model method at Oasis Montaj that obtained 11.8 million tons of resources.
AIANG: Revolutionizing Student Productivity and Well-being in the Bangkit Program through AI-Driven Schedule Management Muhlisin, Haris; Yatini, Y
Journal of Innovation and Applied Technology Vol 10, No 2 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jiat.2024.10.02.007

Abstract

Application of Geoelectric Method to Determine the Distribution of Liyangan Temple in Central Java Surya Utama, Bonang; Yatini, Y; Seno Giamboro, Wrego; Hamdallah, Hafiz
AMERTA Vol. 42 No. 2 (2024)
Publisher : Penerbit BRIN (BRIN Publishing)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/amt.2024.4932

Abstract

Abstract, Application of Geoelectric Method to Determine the Distribution of Liyangan Temple in Central Java. The Liyangan Site was buried on the slopes of Mount Sindoro in a fairly complete condition, with the Liyangan Temple and a residential complex. Knowing the existence of the temple and residential complex is very important in helping to reveal the history of the complex. The geoelectric method aimed to obtain the distribution towards the lateral and depth of the temple. This method provides an overview of the distribution of the Liyangan Temple and settlement based on differences in the resistivity properties of igneous rocks (as temple materials) and the surrounding rocks (alluvial or pyroclastic rocks from the eruption of Mount Sindoro). There are nine geoelectric lines in dipole-dipole confguration, consists of fve parallel and four perpendicular lines, with a spacing of 10 meters and n = 1-8. Res2DInv was used to process the geoelectric data. The results show that the resistivity values below the surface are classifed into four criteria, which are low resistivity with a value of <100 Ω.m is interpreted as soil, medium (100-490 Ω.m) as pyroclastic breccia lithology, high (490-2100 Ω.m) as volcanic breccia lithology, and high resistivity value of 2100 Ω.m is interpreted as andesite lava at a depth of 20-40 meters below the surface. The results also show that six lines have very high resistivity value anomalies (>2100 Ω.m) and are located on the surface to a depth of 4 meters, which are interpreted to be the remains of the foundation of the Liyangan Temple. Keywords: Liyangan Temple, Resistivity, Geoelectric, Dipole-Dipole   Abstrak. Situs Liyangan yang terkubur di lereng Gunung Sindoro ditemukan dalam kondisi yang cukup lengkap, yaitu terdapat Candi Liyangan dan kompleks pemukiman. Mengetahui keberadaan candi dan kompleks permukiman menjadi permasalahan yang sangat penting dalam membantu upaya mengungkap sejarah kompleks tersebut. Upaya untuk memperoleh distribusi ke arah lateral maupun kedalaman candi dilakukan dengan metode geolistrik. Metode ini memberi gambaran persebaran Candi Liyangan dan pemukiman, berdasarkan perbedaan sifat resistivitas batuan beku (sebagai bahan candi) dan batuan sekelilingnya (aluvial atau batuan piroklastik produk letusan Gunung Sindoro). Sebanyak sembilan lintasan geolistrik konfigurasi dipole-dipole diambil untuk bisa memetakan kondisi bawah permukaan. Lima lintasan sejajar dan empat lintasan yang tegak lurus, dengan spasi 10 meter dan n=1-8. Res2DInv digunakan untuk mengolah data geolistrik. Hasil penelitian menunjukkan nilai resistivitas di bawah permukaan digolongkan menjadi resistivitas rendah dengan nilai <100 Ω.m diinterpretasikan sebagai soil, medium (100-490 Ω.m) sebagai litologi breksi piroklastik, tinggi (490- 2100 Ω.m) sebagai litologi breksi vulkanik, dan sangat tinggi dengan nilai 2100 Ω.m diduga sebagai lava andesit pada kedalaman 20-40 meter di bawah permukaan. Hasil penelitian juga menunjukkan bahwa enam lintasan memiliki anomali nilai resistivitas yang sangat tinggi (>2100 Ω.m) dan terletak di permukaan tanah sampai kedalaman 4 meter yang diduga merupakan sisa bagian dari pondasi Candi Liyangan. Kata kunci: Candi Liyangan, Resistivitas, Geolistrik, Dipole-Dipole
KORELASI LOG DAN DATA LABORATORIUM UNTUK MENENTUKAN KUALITAS BATUBARA DI DAERAH BANGKO BARAT, TANJUNG ENIM, SUMATERA SELATAN Budi, Yudanto Setyo; Yatini, Y
Jurnal Geosaintek Vol. 7 No. 1 (2021)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Aplikasi metode well logging untuk mengetahui kualitas lapisan batubara dilakukan di daerah Banko Barat, Tanjung Enim, Sumatera Selatan. Kompilasi analisis log density, log gamma ray dan korelasi data laboratorium dilakukan di tiga sumur yaitu Alkana 1, Alkuna 2 dan Alkena 3. Hasil analisa data well logging menunjukkan batubara memiliki nilai rata-rata log gamma ray sebesar 0-10 CPS, sedangkan log densitas sebesar 300-600 CPS. Korelasi densitas dengan volatile matter diperoleh nilai koefisien 0.0281 negatif, sedangkan densitas dengan ash content sebesar 0,0408 negatif. Korelasi densitas dengan nilai kalori sebesar 0.3316 positif dan dengan fixed carbon bernilai 0.077 positif. Korelasi densitas dengan total moisture bernilai 0.0436 negatif dan terhadap kandungan sulfur bernilai 0.0008 negatif. Hasil analisa data well loging dan korelasi data laboratorium menunjukkan batubara di daerah Bangko Barat memiliki kualitas yang baik dan memiliki peringkat batubara subbituminous.
DIMENSIONALITY AND GEOELECTRICAL STRIKE OF MAGNETOTELLURIC DATA USING TENSOR IMPEDANCE IN “X-AREA” EAST NUSA TENGGARA, INDONESIA Heidar, Ismail; Yatini, Y; Asep, Sugianto
Indonesian Physical Review Vol. 5 No. 2 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i2.147

Abstract

Geothermal exploration was conducted using the magnetotelluric method in “X-area” East Nusa Tenggara, Indonesia, to obtain the potential area and subsurface structure information. Dimensionality analysis and rotation by tensor impedance were conducted to determine the data character and regional geoelectrical strike direction of the 9-point measurement. Skew and polar diagrams were produced to estimate dimensionality inversion and azimuth rotating MT data as geoelectrical strike research areas. The result shows that the domination of skews greater than 0.3 indicates 1-D and 2-D data character. The data was validated by polar diagram analysis at 10-2 Hz to 103 Hz frequency to find 2-D characters and 2D modeling. The geoelectrical strike analysis obtained MT data rotation shows the research area with regional strike N 107° E as an azimuth for rotating nine sites’ MT data. The result of modeling by data analysis shows no ambiguity model, lowest RMS grade, and matches with the geological condition of the research area.
MICROZONING OF HAZARD VULNERABLE USING MICROSEISMIC METHOD WITH HVSR (HORIZONTAL TO VERTICAL SPECTRAL RATIO) ANALYSIS IN BAYAT DISTRICT, KLATEN, INDONESIA Yatini, Y; Kustanto Putra , Abdurrohim; Sungkowo , Ari
Indonesian Physical Review Vol. 6 No. 2 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i2.206

Abstract

The Yogyakarta earthquake in 2006 caused damage in several areas, especially in the area of Klaten Regency. As a result, many infrastructures, houses, health facilities and casualties have been damaged. The research was conducted with the target of knowing the level of earth's hazard by microzoning soil vulnerability areas in the Bayat District, Klaten, Central Java. This study used the microseismic method with the HVSR (Horizontal to Vertical Spectral Ratio) analysis method. Where are the natural/dominant frequency parameters, natural amplification, and earthquake vulnerability index as measured parameters? This study aims to carry out microzonation of disaster vulnerability risks which are interpreted from the results obtained, namely amplification maps (A0), dominant frequency (f0), earthquake vulnerability (Kg), and shear wave velocity maps at a depth of 30 meters (Vs30). Data acquisition was carried out at 19 measurement points with a spacing between points having a distance of 1-2 km using a portable TDS seismograph. The acquisition results obtained varied values with A0 values 0.9 – 8.8, f0 values 1.0 – 13.8 Hz, Kg values 0.4 – 38.5, and Vs30 values 228.1 – 1635.4 m/s. From these results it can be categorized as zoning regarding the value of the level of disaster vulnerability based on the value of earthquake vulnerability (Kg) obtained to minimize damage and casualties  
APPLICATION OF VERTICAL ELECTRICAL SOUNDING (VES) IN GROUNDWATER AQUIFER ESTIMATION IN THE "SPR" AREA, WONOGIRI DISTRICT, WONOGIRI REGENCY, CENTRAL JAVA Sepriyenra, Revaldo; Yatini, Y; Dewi, Ira Kusuma
Indonesian Physical Review Vol. 7 No. 3 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i3.288

Abstract

“SPR” area in Wonokarto Village, Wonogiri Regency, Central Java Province, is one area with serious groundwater problems. Regional conditions and significant population growth cause the need for clean water to increase. Efforts to obtain groundwater reserves continue to be made to overcome this problem. Identification of aquifers is carried out using resistivity methods. The research aims to determine the presence and types of an aquifer based on resistivity methods. Using the Schlumberger configuration, data was acquired at ten Vertical Electrical Sounding (VES) points. Results of the research show that in this region, tufa rocks form an aquifer layer in the Quarter Volcan Lava (Qvl) formation, with resistivity ranging from 14.9 to 29.8 Ωm. The “SPR” area has three aquifer types, i.e., surface, shallow, and deep, with (1.5–5) meters, (10.5–25) meters, and (30–129) meters in depth, respectively.
Comparison of DBSCAN Algorithm and Resistivity Data Inversion, Case Study of Identification of Granite Distribution in ‘Zs’ Area Muhammad Azis Albar; Yatini, Y
Journal of Engineering and Scientific Research Vol. 7 No. 1 (2025)
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 | DOI: 10.23960/jesr.v7i1.168

Abstract

The emergence of automatic data analysis techniques based on data mining algorithms can be applied in various fields including geophysics, thereby improving the quality of interpretation results. Wanner-Schlumberger configuration resistivity data were used in this study. Geoelectric data processing usually uses inversion methods, to determine the true resistivity distribution below the surface. This study proposes the use of the DBSCAN algorithm. Inversion comparison with linearization and clustering with the DBSCAN algorithm is carried out to identify granite dispersal in the 'ZS' area. The clustered cross-section has a clearer picture than the inversion cross-section. Based on the interpretation results on the resistivity cross-section that has an RMS error value of 0.68%, three ranges of resistivity values can be interpreted, namely low resistivity values < 100 ohms.m are indicated as soil, medium resistivity values of 100 – 500 ohms.m are indicated as granite gravel aquifers, and resistivity values > 500 ohms.m are indicated as pink basement granite. The cross-section of clustering results with input parameters eps 0.22 and mints 7 is interpreted. Namely, cluster 1 is an unsaturated granite gravel aquifer, cluster 2 is a saturated granite gravel aquifer, cluster 3 pink granite bedrock, cluster 4 soil and noise of 5.54%
Co-Authors Agus Santoso Asep, Sugianto Budi, Yudanto Setyo Getsimany, Chrismast Hamdallah, Hafiz Heidar, Ismail ira kusuma dewi Kustanto Putra , Abdurrohim Muhammad Azis Albar Muhlisin, Haris Nugraheni, Elleona Septi Nur Rohman, Hafid Rizki Seno Giamboro, Wrego Sepriyenra, Revaldo Sungkowo , Ari Surya Utama, Bonang