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All Journal Majalah Geografi Indonesia Forum Geografi JIPF (Jurnal Ilmu Pendidikan Fisika) KURVATEK Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Hurien Helmi
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Identifikasi Sesar Aktif di Pulau Bali dengan Menggunakan Data Pemetaan Geologi Permukaan dan Morfologi Tektonik Hurien Helmi; Gayatri Indah Marliyani; Siti Nur’aini
Majalah Geografi Indonesia Vol 35, No 1 (2021): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mgi.61928

Abstract

Pulau Bali dan sekitarnya berada dekat dengan zona subduksi sehingga rawan terhadap bencana gempa bumi. Struktur utama yang menyebabkan gempa bumi di Bali umumnya berada di zona subduksi di bagian selatan dan di zona sesar naik belakang busur di utara yang dikenal dengan sesar naik Flores. Selain potensi gempa dari kedua zona sesar ini, gempa yang berasal dari zona sesar di darat juga bisa menimbulkan bahaya yang signifikan. Penelitian ini bertujuan untuk melakukan pemetaan sesar aktif di darat dengan menggunakan kombinasi antara metode penginderaan jauh dengan survey lapangan. Data yang digunakan sebagai peta dasar adalah data digital elevation (DEM) model DEMNAS beresolusi 8 m serta data DEM beresolusi 0.5 m yang dihasilkan melalui proses fotogrametri dari foto udara. Analisis kelurusan menunjukkan adanya pola berarah baratlaut-tenggara dan timulaut-baratdaya. Validasi di lapangan menunjukkan bahwa kelurusan ini berasosiasi dengan keberadaan sesar-sesar geser, sesar oblique dan sesar turun. Sesar-sesar ini memotong batuan berumur Kuarter hingga endapan masa kini. Selain itu, data sebaran seismisitas menunjukkan adanya zona kegempaan dangkal yang berada pada area di sekitar kelurusan yang dipetakan. Kedua indikator ini menunjukkan bahwa sesar-sesar yang teridentifikasi dalam penelitian ini bisa dikategorikan sebagai sesar aktif. Hasil dari penelitian ini memberikan pemahaman baru mengenai geometri sesar aktif yang ada di Pulau Bali dan potensi kegempaan di masa yang akan datang yang memberikan kontribusi terhadap upaya mitigasi bencana gempa bumi di Pulau Bali. Bali and its surrounding region are located within proximity of the Sunda-Banda subduction zone making it prone to earthquake hazards. The structures that caused earthquakes in Bali are mainly from the front subduction faults and from the back-arc thrust fault known as the Flores Fault. In addition, earthquakes are frequently occur in the inland fault system. This study aims to map the inland active faults in Bali using a combination of remotely-based and field-mapping methods. We use the 8-m resolution digital elevation model (DEM) of DEMNAS and the 0.5 m resolution DEM from photogrammetry processing of aerial photo as our base maps. Our lineament analysis identifies northwest-southeast and northeast-southwest lineaments. Our field observation confirms these lineaments to be associated with strike-slip, oblique and normal faults. These faults dissect Quarternary to recent rock units. In addition, seismicity data indicate the occurrence of shallow earthquakes in the vicinity of these structures. All of these indicate that these structures are active. Results from this study provide a new understanding of the inland active fault geometry in Bali, useful in the seismic hazard analysis and may contribute to the earthquake mitigation efforts in Bali.   
Identification of Slip Surfaces Using the Geoelectric Imaging Method in the Kalirejo Area, Kokap District, Yogyakarta, Indonesia Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
JIPF (Jurnal Ilmu Pendidikan Fisika) Vol 6, No 3 (2021): September 2021
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jipf.v6i3.2072

Abstract

Landslides are a significant threat to the environment, infrastructure, and human activity, especially in mountainous and hilly areas. It is, therefore, important to accurately identify the social movements that trigger these processes. The resistivity method can investigate subsurface geological variations, including the potential for landslides. This research was conducted to investigate the subsurface structures in the Kalirejo Village area, Kokap District, Kulon Progo Regency, Yogyakarta regarding identifying the sliding location. This investigation includes five lines of tomographic geoelectric measurements. The results show that the slips surface is at a depth of about 5-10 m with a high resistivity value and the landslide material is weathered soil, and the slip surface is andesite. The resistivity of andesite in range 668-1600 Ωm. The landslide material's thickness is around 5-8 m with resistivity in the range 4,01-22.1 Ωm. Landslide material is water-saturated soil.
Identification of Andesite Resource Potential In Kalirejo Area, Kokap Sub-District, Kulon Progo Using Resistivity Method Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
Forum Geografi Vol 35, No 1 (2021): July 2021
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v35i1.13507

Abstract

In the last five years, the need for materials to build infrastructure in Kulon Progo Regency has increased with the construction of an international airport. In the construction process, strong earth or rock materials are needed to make buildings resistant to earthquakes, one of which is andesite rock. This study aims to determine andesite rocks' resources using a three-dimensional model based on the value of resistivity in Kalirejo district Kokap Kulon Progo. The research was conducted by geological and geophysical survey. Based on data on the distribution of rocks in the research area included in the intermediate igneous rocks, andesite. These rocks are intrusions that develop in research areas. Petrography analysis is used to determine the types of minerals in andesite rocks and determine which levels of rock changes have changed or not to affect the strength of rocks. These rocks are intrusions that develop in research areas. Geophysical survey is by resistivity method using configuration dipole-dipole with five lines, and each stretch is 200 m. Based on three-dimensional model resistivity, fresh andesite is at a depth of between 5-10 m. Value of andesite resistivity is more than 668 Ωm, while the value of weathered andesite resistivity ranges from 256-536 Ωm and andesite resources about 332,580 tons.
DAYA TAMPUNG TANAH TERHADAP INFILTRASI AIR PERMUKAAN PADA KASUS GENANGAN AREA PERSAWAHAN DESA KATEKAN, GANTIWARNO, KLATEN. Wisnu Aji Dwi Kristanto; Hurien Helmi
KURVATEK Vol 4 No 1 (2019): Reka Ruang
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i1.1117

Abstract

Lahan pertanian yang tersedia di Indoesia semakin terbatas. Keterbatasan yang ada dibarengi dengan pemanfaatan yang kurang maksimal. Faktor material penyusun tanah lahan pertanian menjadi salah satu penyebab utama kurang maksimalnya pemanfaatan lahan pertanian. Perbedaan material penyusun tanah, menyebabkan karakter tanah satu dengan yang lain berbeda, diantaranya adalah kemampuan tanah untuk menampung dan meloloskan air. Kemampuan ini sangat mempengaruhi tingkat produktifitas tanah lahan pertanian. Sebagai contoh, tanah pasiran memiliki kemampuan menampung air lebih kecil dibanding dengan tanah lempungan. Tanah dengan ukuran butir pasir halus-pasir kasar memiliki kecepatan meloloskan air sebesar 10-2-10 mm/dtk, sedangkan tanah dengan ukuran butir lanau-lempung  memiliki kecepatan meloloskan air sebesar 10-5-10-8mm/dtk. Desa katekan merupakan daerah yang area persawahannya sering digenangi oleh air permukaan dalam waktu yang tidak wajar pada saat musim penghujan.Dengan pengamatan kondisi geologi dilapangan, Desa Katekan tersusun oleh endapan alluvial lempung di seluruh area persawahan. Sedangkan area yang lain terdiri dari endapan alluvial lempung pasiran. Desa katekan dengan luas lahan pertanian 70,6 ha, dibagi menjadi area persawahan bagian selatan dan bagian utara.Berdasarkan analisa batas cair dan batas plastis, diperoleh daya tampung tanah lapisan atas area persawahan Desa Katekan terhadap infiltrasi air permukaan sebesar 131.219.550 liter untuk area persawahan bagian selatan dan 288.307.415 liter untuk area persawahan bagian utara, permasalahan genangan air permukaan disebabkan oleh kecepatan infiltrasi atau kemampuan meloloskan air kebawah permukaan yang sangat kecil yaitu 0,864 mm/hari  untuk area persawahan bagian selatan dan 0,0864 mm/ hari untuk area persawahan bagian utara sehingga air lebih banyak tertahan dipermukaan menjadi genangan. Kata kunci: Genangan, Daya Tampung Tanah, Batas Cair, Lempung
KONTROL GEOLOGI TERHADAP PEMUNCULAN MANIFESTASI PANASBUMI DI KAWASAN GUNUNG LAWU Hurien Helmi; Hengky Kurniawan; Widi Adam
KURVATEK Vol 5 No 1 (2020): April 2020
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v5i1.1790

Abstract

Gunung Lawu exhibit a prominent geothermal manifestation indicate promising geothermal potentials. The occurence of geothermal manifestations around the volcano indicates the occurrence of geothermal system in the area. Further detail investigations are required to confirm the occurrence of a well established geothermal system. Information about the geological factors controlling the geothermal manifestation is crucial to understand the geothermal system in an area. We analyze the previously available geological maps, lineament density, and geochemical analysis of the hotsprings in the area of Mt. Lawu to understand the correlation between the geological condition, especially the structural geology and the geothermal manifestation. Our results indicates that the occurence of the geothermal manifestations in the area is not directly correlated with the mapped major normal faults, but instead with the minor fracture regions. The lineament fractal density analysis also indicate that the high fractal density value does not coincide with the faults. The faults are located in the regions of medium fractal density. It is likely that the high lineament fractal density is mostly controlled by surface processes insetad of representing tectonic significance. The occurrence of the geothermal manifestations are located in the medium lineament density value, which may represented areas with minor fractures. Geochemical analysis supports this interpretation, analysis of the geochemistry of the samples taken from Cumpleng and Ngunut hotsprings shown bicarbonate-type. We also observe the presence of limonite and travertin deposits. This type of geothermal fluids and mineral deposits are commonly associated with the presence of fractures and cracks below or near the surface.
DETERMINATION OF COAL RANKING BASED ON MACERAL ANALYSIS IN TANJUNG BELIT REGION, DHARMASRAYA REGENCY, WEST SUMATERA PROVINCE Obrin Trianda; Paramitha Tedja Trisnaning; Rizqi Prastowo; Hurien Helmi
KURVATEK Vol 7 No 2 (2022): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v7i2.3169

Abstract

Daerah penelitian berada pada Desa Tanjung Belit, Kabupaten Dharmasraya, Sumatera Barat yang termasuk dalam Cekungan Sumatera Selatan, Sub-Cekungan Jambi. Metode penelitian berupa pemetaan dan pengambilan conto sampel batubara yang dilakukan sebagai dasar analisa maseral dan piroksimat. Berdasarkan dari hasil analisis maseral, pada daerah penelitian dapat dibedakan menjadi dua seam batubara, yaitu Seam A dan Seam B. Hasil analisis RV (Refletan Vitrinite), Seam A batubara mempunyai nilai 0,47% yang menunjukkan hasil kalori batubara seam A berupa High Volatile Bituminous C. Seam B memiliki nilai RV sebesar 0,39% – 0,46% yang menunjukkan nilai kalori berupa Sub Bituminous. Hasil analisis maseral Seam A dan Seam B memiliki perbedaan yang cukup besar dalam kelompok inertinite, yaitu: Seam A memiliki nilai inertinte 3,0% – 4,4% dan Seam B memiliki nilai inertinte 12% – 18.8%. Nilai vitrinite tinggi mencirikan pembentukan batubara pada kelompok ini berasal dari tumbuhan yang telah terbakar dan sebagian besar berasal dari proses oksidasi maseral lainya (dexarboxylaction). Proses oksidasi maseral terjadi disebabkan oleh bakteri dan jamur, sehingga akan meningkatkan abu dan sulfur pada suatu batubara.
Perekaman Fitur-Fitur Geologi Secara Cepat dengan Metode Fotogrametri Hurien Helmi; Obrin Trianda
Retii Prosiding Seminar Nasional ReTII ke-13 2018
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Pengambilan data geologi sangat bergantung pada pengamatan singkapan batuan di lapangan. Pada umumnya batuan di Indonesia tertutup oleh lapisan tanah yang tebal dan tersingkap akibat adanya longsoran atau torehan sungai, sehingga seringkali meskipun singkapan itu bisa diamati dengan baik aksesibilitasnya terkadang tidak memungkinkan untuk pengukuran data geologi secara langsng. Selain itu, di daerah yang banyak terdapat penambangan aktif, preservasi singakapan juga menjadi kendala. untuk itu diperlukan suatu metode perekaman data singkapan secara mudah, aman dan dan cepat. Dalam penelitian ini kami menerapkan metode fotogrametri untuk merekam data singkapan di daerah Bayat, Jawa Tengah. teknik fotogrametri ini akan menghasilkan model tekstur 3D dan tiled model dari singkapan yang diamati sehingga elemen-elemen geologi seperti batas kontak batuan, bidang struktur dan tekturs batuan bisa terekam dan dikenali dengan baik. hasil analisa ini kemudian kami bandingkan dengan data pengamatan dan pengukuran secara langsung untuk memvalidasi bahwa metode ini bisa diandalkan dan diterapkan di daerah ini. Hasil pengamatan dan pengukuran di lapangan. Proses yang cukup cepat dan relatif mudah yang mulai dimulai dari pengambilan foto hingga prosessing dengan menggunakan software Agsisoft Photoscan membuat metode ini sangat bermanfaat untuk digunakan di dalam pendokumentasiaan data singkapan batuan.
ANALISIS KETERDAPATAN MINERAL EKONOMIS DENGAN METODE LINEANMENT DENSITY DISEKITAR KECAMATAN PANGKALAN JAMBU, KABUPATEN MERANGIN, PROVINSI JAMBI. MAULANA DIMAS KIRANA; HURIEN HELMI; OBRIN TRIANDA
Retii 2021: Prosiding Seminar Nasional ReTII ke-16
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

One area that is famous for the existence of gold mines owned by the people in Jambi Province is in Merangin Regency, more precisely around Pangkalan Jambu District. The presence of gold mines around the research area indicates the result of hydrothermal alteration in the form of gold deposits. The use of geographic information systems aims to determine the location of the lineament density zone which is estimated to be the source of hydrothermal alteration. The purpose of this study is to model lineament density by utilizing secondary data in the form of DEM data which is added with hillshade to extract lineaments, then combined with structure on lineaments based on Regional Geological Maps. The results showed that high and medium density zones were located in areas associated with fault zones, which is one of the strong factors for the presence of alteration in areas that have a strong structural density or crushed zone. It is known that the majority of mines are in the medium-low density zone close to the river flow, this can happen because the river passes through several density zones at once can be used as a transportation medium for materials that have experienced erosion so that they can be deposited in areas that are currently under water. mine. It is known that there is potential for alteration in 2 zones of medium and high density, each having an estimated area of ​​4130.50 Ha in the high density zone and 49557.53 Ha in the medium density zone.
Karakteristik Geokimia Fluida Reservoar Pada Mata Air Panas Jengglong dan Pablengan, Kabupaten Karanganyar, Jawa Tengah Hurien Helmi
Retii 2022: Prosiding Seminar Nasional ReTII ke-17
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The old and young Lawu Mt complex exhibit significant geothermal manifestation indicate a promising geothermal potentials. The occurence of geothermal manifestations around the volcano whether it is in the upflow and outflow zones may indicates the occurrence of geothermal system in the area and is an interesting subject to be investigated. We analyze the geochemistry characteristic of reservoar fluids at Pablengan and Jengglong hotsprings to estimate the temperature at depth. We analyze the existing geological, lineament maps as well as conducting geochemistry analysis using Cl-:SO4-:HCO3-, Cl-:B:Li, and Na:K:Mg triangle diagrams. Our analysis indicate that the type of the geothermal fluids for both springs is dominated by chloride water and came from an old geothermal system. We estimate a reservoar temperature of 63oC- 155oC for Pablengan and 84oC - 182oC for Jengglong spring. The Pablengan manifestation appears to be controlled by fault as it is located only 200 meters from mapped fault while the closest fault from Jengglong manifestation is located ~2km from the spring and does not directly controlled the manifestation. Our study indicate a promising temperature range at depth, more detailed analysis of the subsurface condition is necessary to reveal its full potentials.
Analisa Stabilitas Lereng di Area Bendungan Kerinci, PLTA Merangin, Kecamatan Merangin, Kabupaten Kerinci, Provinsi Jambi I Putu Audiantafika; Hurien Helmi; Obrin Trianda
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

This study aims to evaluate the geological conditions of the research area and the geological potential it contains. The limit equilibrium analysis of PT Kerinci Merangin Hidro indicates that the slope is in a safe condition, with safety factors obtained from the GLE/Morgenstern method at 1.8, from the Spencer method at 1.9, and from the Bishop Simplified method at 1.9. The installation of rock bolts with a spacing of 3.5 meters between each bolt has reached the standard point, considering the lithological conditions. However, the rock bolt installation has not penetrated the sliding surface. The safety factor without rock bolts obtained from the finite element analysis is 1.3. Although the factor of safety has reached a safe point, the addition of reinforcement needs to be considered by analyzing the sliding surface using the finite element method, taking into account the largest total displacement. Based on the interpretation results with an average depth of approximately 10-11 meters from the slope surface, a rock bolt length of about 13-14 meters is required. The lithology that needs attention in the right bank area is lapilli lithology with a rock class of low (CL)." Note: This abstract is a concise summary of the research provided. For any specific purposes or further inquiries about this research, it is essential to refer to the original research document to gain a more in-depth understanding.
Co-Authors Ade Dewantara Dianto Isnawan Fahru Friwansyah Gayatri Indah Marliyani Hengky Kurniawan I Putu Audiantafika MAULANA DIMAS KIRANA Paramitha Tedja Trisnaning Rizqi Prastowo Rofiqul Umam Siti Nur’aini Widi Adam Wisnu Aji Dwi Kristanto