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All Journal Journal of Innovation and Applied Technology Jurnal Geofisika Journal of Scientech Research and Development
Muhlisin, Haris
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Humanities Computer Science & IT Earth & Planetary Sciences Education Energy Industrial & Manufacturing Engineering Physics Social Sciences

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DETERMINATION OF SAND MINING PROSPECTIVE ZONES BASED ON SEDIMENT THICKNESS ANALYSIS USING HVSR MICROTREMOR AND GRAVITY METHODS: A CASE STUDY IN CANGKRINGAN, SLEMAN, DAERAH ISTIMEWA YOGYAKARTA Sidik, Firdos Bahar; Ramadeo, Muhammad Gilang; Wulandari, Maria Diyah Ayu; Khumairo, Savira Zahrul; Nurkholijah, Ekasari; Pangestu, Farizki Budi; Fitrinova, ⁠Safina; Muhlisin, Haris
Journal of Scientech Research and Development Vol 6 No 1 (2024): JSRD, June 2024
Publisher : Ikatan Dosen Menulis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56670/jsrd.v6i1.272

Abstract

Mount Merapi is the most active type A volcano, especially on the island of Java. It produces sediment products totaling 140 million m3 located at the peak of Mount Merapi, descending through the mountain slopes to rivers originating from Mount Merapi. This sediment is subsequently utilized as a sand mining area. Therefore, it is necessary to determine prospect zones for sand mining that align with environmental, economic, and mitigation aspects in the Cangkringan area, Sleman, Yogyakarta Special Region. Seventeen microtremor measurement points were used with the Horizontal to Vertical Spectral Ratio (HVSR) method to determine sediment thickness, constituent lithology, and mining zones suitable for safety and mitigation aspects. Additionally, the gravity method was employed with 247 measurement stations obtained from GGM Plus to determine rock density and estimated thickness based on 2.5D modeling. The study resulted in the distribution of dominant soil frequencies ranging from 0.5 Hz to 7.5 Hz. High frequencies indicate old rocks, while medium frequencies suggest alluvial rocks with a thickness of ± 5 m. Low frequencies indicate alluvial rocks with a thickness exceeding ± 30 meters. Based on gravity results, the average depth is ±90-200 m with a density of 2.6 g/cm3, reflecting the depth of the bedrock in the study area, composed of andesitic volcanic rock. Soil vulnerability analysis in the study area classified into three categories, with values of 4.2-5.4 being highly vulnerable to surface deformation, values of 1.8-3.8 indicating moderate vulnerability, and values of -0.2-1.4 representing low vulnerability. Furthermore, the Peak Ground Acceleration (PGA) ranges from 500-1200 gal with intensity X. Ground Shaking Spectrum (GSS) data indicates that the study area experiences vibration phenomena with elastic soil dynamics. Therefore, the exploitation of sand resources in the Cangkringan area can be conducted in the southern region of Mount Merapi, approximately 2 km away from the mountain center. This is because the southern part of the research area has suitable mitigation measures. Moreover, based on the analysis, sediment thickness in this area ranges from ± 5-30 meters.
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

Rekonstruksi Prospek Endapan Mineralisasi di Kaligesing: Pendekatan Terintegrasi Geologi, Geomagnetik, dan Gravitasi Satelit Muhlisin, Haris; Nur Hani, Muhammad Alfa; Falahi, Akmal Nazla
Jurnal Geofisika Vol 23 No 1 (2025): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v23i1.679

Abstract

Kehadiran struktur geologi dan posisinya sebagai fasies pusat pada daerah tengah Pegunungan Menoreh menyebabkan berkembangnya alterasi dan mineralisasi di bagian batuan intrusi andesit. Selain itu daerah fasies pusat/central ini sebagai tempat terbentuknya batuan ubahan epidot-klorit kalsit di sisi barat Gunung Gajah yakni di daerah Kaligesing. Penelitian ini menyelidiki potensi mineralisasi di daerah Kaligesing, Purworejo, Jawa Tengah dengan mengintegrasikan data geofisika gravitasi dan magnetik. Metode gravitasi satelit (GGMPlus) sebagai survei awal dilakukan di area seluas 7x8 km yang mengidentifikasi titik penelitian berdasarkan nilai densitas. Survei geomagnetik yang lebih rinci kemudian dilakukan di plot seluas 3x4 km dengan 248 titik akuisisi yang diukur. Hasil metode gravitasi menunjukkan nilai Anomali Bouguer Lengkap (CBA) berkisar antara 96,9 hingga 128,7 mGal dengan nilai tinggi di bagian barat dan nilai sedang hingga rendah di bagian timur. Variasi ini menunjukkan perbedaan densitas batuan dan potensi kontrol struktural terhadap mineralisasi. Survei geomagnetik mengungkapkan nilai Intensitas Magnetik Total (TMI) berkisar antara -102,7 hingga 584,1 nT dengan daerah bersuseptibilitas tinggi (584,1 hingga 220,3 nT) yang menunjukkan zona-zona yang kaya mineral potensial. Peta Reduce to Pole (RTP) mengungkapkan struktur sesar yang berorientasi utara-selatan dan barat laut-tenggara. Peta filter Total Horizontal Gradien (THG) dan Tilt Angle (TA) menyoroti batas anomali yang menunjukkan sesar-sesar yang mengontrol mineralisasi. Metode geofisika yang terintegrasi dengan data geologi ini secara efektif memetakan struktur-struktur pengendali dan saling menguatkan interpretasi, yang membantu dalam mengidentifikasi zona mineralisasi prospektif.
Co-Authors Falahi, Akmal Nazla Fitrinova, ⁠Safina Khumairo, Savira Zahrul Nur Hani, Muhammad Alfa Nurkholijah, Ekasari Pangestu, Farizki Budi Ramadeo, Muhammad Gilang Sidik, Firdos Bahar Wulandari, Maria Diyah Ayu Yatini, Y