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All Journal Indonesian Journal of Geography Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat Journal of Degraded and Mining Lands Management Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Jurnal Pendidikan Geografi: Kajian, Teori, dan Praktik dalam Bidang Pendidikan dan Ilmu Geografi Jurnal Teknologi Mineral dan Batubara 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 Mining Journal Buletin Sumber Daya Geologi JURNAL SUMBER DAYA AIR Kumawula: Jurnal Pengabdian Kepada Masyarakat Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Perspektif Pembiayaan dan Pembangunan Daerah Journal of Geoscience Engineering and Energy (JOGEE) Jurnal Geominerba Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology Indonesian Mining Journal Geoid - Journal of Geodesy and Geomatics
Emi Sukiyah
Fakultas Teknik Geologi, Universitas Padjadjaran
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Quantitative Geomorphology Approach in the Assessment of Relative Tectonic Activity in Cikandang Watershed, South West Java Fahira, Ghina; Sukiyah, Emi; Muslim, Dicky
GEOID Vol. 20 No. 1 (2025)
Publisher : Departemen Teknik Geomatika ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/geoid.v20i1.2619

Abstract

Cikandang Watershed in Cisewu Block, South West Java, is an area with significant tectonic activity that is reflected in geomorphological characteristics. This study aims to evaluate the relative tectonic activity in the Cikandang watershed using a quantitative geomorphological approach. Research methods involved six morphotectonic parameters: Valley Height-Width Ratio (Vf), Mountain Face Sinusity (Smf), Basin Shape Index (Bs), Asymmetry Factor (Af), Integral Hypsometry (Hi), and River Length Gradient Index (SL). These parameters were analysed to determine the Index of Relative Tectonic Activity (IATR) in 45 3rd-order catchments. Results showed variations in the level of tectonic activity in the Cikandang watershed. Based on the Index of Relative Tectonic Activity (IATR) value, 6 catchments belong to the high tectonic class, 34 catchments are in the medium tectonic class, and 5 catchments are in the low tectonic class. Analysis results indicate the presence of intensive tectonic deformation. These distributions reflect the significant influence of ‘moderate’ tectonic activity which is also indicated by the role of erosional processes in shaping the geomorphology of the Cikandang watershed. Morphotectonic features such as V-shaped valleys and irregular drainage patterns support the indication of tectonic activity. This research provides an overview of the influence of tectonic activity on geomorphological development in the Cikandang watershed.
ALTERASI HIDROTERMAL GUNUNG RENDINGAN BERDASARKAN ANALISIS PETROGRAFI DAN X-RAY DIFFRACTION (XRD) Gentana, Dewi; Sulaksana, Nana; Sukiyah, Emi; Yuningsih, Euis Tintin
Buletin Sumber Daya Geologi Vol 13 No 3 (2018): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v13i3.231

Abstract

Daerah penelitian terletak di daerah panas bumi Gunung Rendingan, Kabupaten Tanggamus, Provinsi Lampung. Daerah penelitian dipengaruhi oleh Sesar Semangko, mempunyai pola sesar berarah Barat Laut -Tenggara dan Timur Laut – Barat Daya. Penelitian bertujuan untuk mengetahui himpunan mineral alterasi berdasarkan analisis petrografi dan X-Ray Diffraction (XRD). Analisis petrografi digunakan untuk mengetahui mineral alterasi sebagai indikator temperatur dan fluida hidrothermal di daerah penelitian. Analisis XRD dilakukan untuk mengindentifikasi jenis mineral lempung. Berdasarkan analisis petrografi dan XRD pada batuan permukaan di daerah penelitian menghadirkan mineral kelompok lempung yang terdiri dari smektit, ilit, serisit dan kaolinit. Hasil analisis petrografi dan XRD terhadap serbuk bor (cutting) dari sumur  XD-1, XD-2 dan XD-3 memperlihatkan  himpunan mineral alterasi hidrotermal smektit-kaolinit-serisit dan ilit-epidot pada sumur XD-1, himpunan mineral serisit-smektit, smektit-ilit dan  ilit-epidot pada sumur XD-2, himpunan mineral smektit-kaolinit dan ilit-smektit-epidot pada sumur XD-3. Berdasarkan himpunan mineral alterasi tersebut dapat diperkirakan temperatur bawah permukaan di daerah penelitian berkisar 150°-300°C pada kedalaman 700 – 1900 mKu sebagai zona reservoir. Kehadiran mineral kalk-silikat yaitu epidot bersama wairaikit dan prehnit sebagai indikator zona reservoir memiliki temperatur yang baik. Batuan di daerah penelitian memiliki permeabilitas yang baik dengan kehadiran mineral adularia.
Stream Morphometry as Response to the Level of Tectonic Deformation on Sorowako and Surrounding Areas, Indonesia Sambodo, Tri Hananto; Sukiyah, Emi; Hutabarat, Johanes
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.17977

Abstract

Sorowako and surrounding areas are geologically influenced by Sulawesi’s microcontinent movement, which has produced several geological phenomena. Morphometry is one of the parameter that can reveal geological condition of particular area. Morphometric analysis of water catchment area in Sorowako and surrounding areas using Bifurcation Ratio (Rb) and Drainage Density (Dd) can provide comprehensive information on level of deformation in Sorowako region. Analysis result of Bifurcation Ratio Index (Rb) on water catchment area reveals that Rb<3 value is dominant and equally spread in Sorowako region, it varies from 0.094 to 2.888. However in several place the value of Bifurcation Ratio (Rb) index is more than 5 (Rb>5) with varies from  5.142 to 10.250. Drainage Density (Dd) value ranges from 0.907 to 8.422 with an average value is 4.125 describes impact of erosion and tectonic on Sorowako region. Based on morphometric analysis of two parameters, Sorowako and surroundings area have been heavily impacted by tectonic activity on Sulawesi island. In western, eastern and northern regions on water catchment area, level of deformation tends to be higher compared to southern region. This can be seen on analysis result of water catchment area 43, water catchment area 196, and water catchment area 302 that have relatively larger number of stream orders, and also have Bifurcation Ratio’s value less than three (Rb<3). Information of tectonic deformation level on Sorowako region through morphometric analysis is important to further use as a basis for water catchment area management planning, so that it can identify areas prone to geological disasters. This fairly high level of tectonic deformation also believed to be a controlling factor for nickel grade contained in Sorowako and surrounding areas which allow supergene enrichment to occurs in rocks.
Pemanfaatan Langsung Air Panas Bumi Gunung Ungaran untuk Terapi Kesehatan Masyarakat: Pendekatan Geokimia dan Nilai Geoheritage: Direct Use of Geothermal Hot Springs from Mount Ungaran for Community Health Therapy: Geochemical Analysis and Geoheritage Value kurnianto, brany; Sukiyah, Emi; Haryanto, Agus Didit; Muljana, Budi
Retii 2025: Prosiding Seminar Nasional ReTII ke-20 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

ABSTRAK Kawasan panas bumi Gunung Ungaran, Jawa Tengah, menampilkan berbagai manifestasi hidrotermal seperti mata air panas Gedongsongo, Nglimut, dan Diwak yang memiliki potensi tinggi untuk pemanfaatan langsung (direct use). Penelitian ini mengkaji karakteristik geokimia air panas bumi serta potensinya sebagai media terapi kesehatan masyarakat berbasis geoheritage. Analisis lapangan dan laboratorium menunjukkan bahwa air panas Ungaran tergolong tipe Na–HCO₃ dengan kandungan dominan SiO₂, Ca²⁺, Mg²⁺, dan HCO₃⁻, pH netral hingga sedikit basa, serta suhu berkisar 38–45°C. Komposisi tersebut berperan penting dalam proses regenerasi kulit, relaksasi otot, dan peningkatan sirkulasi darah, sehingga mendukung fungsi terapeutik alami. Selain temuan ilmiah, penelitian ini juga menyoroti keberadaan situs Candi Derekan sebagai bukti arkeogeologis pemanfaatan air panas sejak masa kerajaan kuno, yang memperkuat nilai geoheritage dan geo-culture kawasan Gunung Ungaran. Dengan demikian, sistem panas bumi Ungaran tidak hanya signifikan sebagai sumber energi, tetapi juga sebagai aset geoheritage berorientasi kesehatan masyarakat, yang merepresentasikan integrasi antara geosains, budaya, dan kesejahteraan komunitas lokal. Pemanfaatan berbasis masyarakat ini berpotensi dikembangkan menjadi geowisata kesehatan berkelanjutan, sekaligus memperkuat upaya konservasi sumber daya panas bumi sebagai bagian dari warisan geologi nasional.
GEOMORPHOLOGY OF CISEWU AREA AND ITS SURROUNDINGS, GARUT REGENCY, WEST JAVA, INDONESIA Zulfi, Damar Sayyidina; Sukiyah, Emi
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

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Abstract

This study analyzes the geomorphological phenomena of the Cisewu area and its surroundings, Garut Regency, West Java, through an integrated approach encompassing morphographic, morphometric, morphogenetic, and morphotectonic was used to analyze landforms as a basis for establishing geomorphological units. The methods used included mapping the earth's surface, Digital Elevation Model (DEM) analysis, slope gradient measurement, drainage pattern interpretation, and lineament analysis. The results identify five main geomorphological units, namely: (1) Andesite Intrusive Dome, (2) Very Steep Structural Valley, (3) Moderately Steep Volcanic Valley, (4) Steep Volcanic Ridge, and (5) Very Steep Structural Ridge. Morphometric analysis shows the dominance of steep (16°–35°) to very steep (>35°) slopes, reflecting strong control by geological structures and resistant lithology. Rectangular and trellis drainage patterns indicate control by fault and joint structures. Morphotectonic analysis using geomorphic indices (Bs, Vf, Af, Smf) indicates ongoing Quaternary tectonic activity, particularly in the Cilayu Sub-Watershed. The formation of these geomorphological units is the result of the interaction between volcanism during the Late Miocene–Pliocene and tectonic deformation by northeast–southwest-trending strike-slip faults. The results of this study provide a scientific basis for land-use planning and landslide hazard mitigation in the study area.
Hotelling's T² confirms REE distribution supporting sustainable land application Pulungan, Linda; Muslim, Dicky; Hirnawan, Febri; Sendjaja, Yoga A.; Sukiyah, Emi; Usman, Dudi Nasrudin
Journal of Degraded and Mining Lands Management Vol. 13 No. 2 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.132.10209

Abstract

Coal ash from stratigraphically complex basins shows compositional variability that can complicate safe land application, yet seam-level geochemical characterization remains limited. This study evaluated whether rare earth element (REE) fingerprints can reliably distinguish coal seams in the Pulau Balang Formation, Kutai Basin, East Kalimantan, Indonesia, and whether the resulting classification supports a tiered screening framework for mine-land rehabilitation. Forty-five coal ash samples from three stratigraphic seam groups (Upper: Seams 1-4; Middle: Seams 9-12; Lower: Seams 17-19 were analyzed for light REEs (La, Ce, Pr, Nd, Sm) by ICP-OES and for major oxides by XRF. REE data were log10-transformed and z-standardized before principal component analysis (PCA), linear discriminant analysis (LDA) with leave-one-out cross-validation (LOOCV), and pairwise Hotelling’s T² testing. Major oxides were treated as compositional data using the centered log-ratio (clr) transformation. PCA explained 79.3% of REE variance on PC1, with La loading separately from the Ce-Pr-Nd-Sm cluster. LDA achieved 100% LOOCV classification accuracy, and Hotelling’s T² confirmed significant multivariate separation across all seam pairs (p<1 × 10-15). In contrast, clr-transformed oxides separated only the Middle and Lower seams (p = 0.0010). Generally, REE fingerprinting provides a stronger basis for seam-source assignment than major oxide profiling and supports seam-based screening for selective stockpile management and controlled coal-ash placement in reclaimed mine lands.
Co-Authors abdurrohman, Muhammad jihad Achmad Sjafrudin, Achmad Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Adjat Sudradjat Agung Mulyo Agus Didit Haryanto Agus Didit Haryanto -, Agus Didit Haryanto Aldrin Ramadian Algi Fajar Ghaniansah, Algi Fajar Andi Agus Nur Andi Makawaru Yasin, Andi Makawaru Apong Sandrawati Arif R. Darana Arifin Anfasha, Arifin Arya, Pulung P Asep Nursalim, Asep Athanasius Cipta Aton Patonah Bani Nugroho, Bani Benny Joy Boy Yoseph Cahya Sunan Sakti Syah Alam Budi Muljana Cipta Endyana Daliman, Shaparas Binti Denny Lumban Raja Dewi Gentana Dicky Muslim Dina Tania Donny R. Wahyudi Dudi Nasrudin Usman Dwi Purnomo Dyah Ayu Setyorini Edi Prasetyo Utomo Edi Tri Haryanto Edi Tri Haryanto, Edi Tri Edy Sunardi Endah, Raras Euis Tintin Yuningsih Fachrudin, Kurnia Arfiansyah Fahira, Ghina Febri Hirnawan Fery Erawan Fery Erawan Fikri Abdulah, Fikri Gilang Firmansyah, Gilang Hendarmawan H Hendarmawan Hendarmawan Herry Riswandi HS, Karyono Ildrem Syafri Iyan Haryanto Jamal Jamal Jamal Jamal Jamal Jassin, A.M.I. Johanes Hutabarat Johanes Hutabarat Karyono HS Khoirullah, Nur kurnianto, brany Linda Pulungan M. Nursiyam Barkah Makkawaru, Andi Martha Magdalena Nanlohy Mawardi, Sonny Mega Fatimah Rosana Moch Ridfan Trisnadiansyah Mohamad Sapari Hadian Muhamadsyah, Faisal Muhammad Lutfi Muhammad Luthfi Faturrakhman Muhammad Ronggour Pardamean Siahaan Mulyono - Nana Sulaksana Nana Sulaksana Nana Sulaksana Nendi rohaendi Nisa Nurul Ilmi Novi Triany Nurfadli, Eza Pradnya P. Raditya Rendra Pradnya P. Raditya, Pradnya P. Pradnya Paramarta Raditya Rendra Puguh Setiyanto, Puguh Pulung Arya Pranantya Pulung Arya Pranantya, Pulung Arya putera, alvindo andreansyah Raden Irvan Sophian Retnoningtyas, Widya Ika Reza Mohammad Ganjar Gani Ridwan, Panji Rina Devnita Rita Yulianti, Rita Sabila, Zahra Syahida sabily, zulfa Sambodo, Tri Hananto Sambodo, Tri Hananto Priyo Saragih, Rahmat Yantono Sendjaja, Yoga A. Setyorini, Dyah Ayu Siahaan, Yakub Sipahutar, Sumahang R. SIRAJU, ASRUL Sonny Mawardi Sri Wahyuni Subagja, Agam Suherman Dwi Nuryana Suherman Dwi Nuryana Sukardan Tawil Sulastri, Murni Sumaryono Sumaryono Suratman Suratman Syalsabilla, Lola Lintang Taat Setiawan, Taat Tresnasari, Endah Undang Mardiana Vijaya Isnaniawardhani Wahyuzi, Radhi Winantris Winantris Winarti Winarti Witjahjati, Retno Yoga Andriana Sendjaja Yuda, Himmes Fitra Yudhi Listiawan Yusuf, Muhammad Farhan Yuyun Yuniardi Zakaria, Zulfiadi Zufialdi Zakaria Zulfi, Damar Sayyidina