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All Journal Jurnal Fisika FLUX Journal of Scientech Research and Development
Sidik, Firdos Bahar
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Humanities Computer Science & IT Earth & Planetary Sciences Education Industrial & Manufacturing Engineering Materials Science & Nanotechnology 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.
Analysis of Hypocenter Position of Bengkulu Earthquake on April 15, 2023 Using 2D and 3D Grid Search Method Based on USGS Data Sidik, Firdos Bahar; Khumairo, Savira Zahrul; Pangestu, Farizki Budi; Sakinah, Triya Illmi; Febrian, Muhamad Raihan Putra; Laksono, Risaldi Fauzan; Nasution, Jihan Syafina
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 3 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i3.21112

Abstract

Earthquakes are natural events that can have serious impacts on human life and the environment. This study aims to improve the accuracy of earthquake hypocenter determination by applying the 2D dan 3D Grid Search method to seismic data recorded by three stations in the Bengkulu area, Indonesia. The analysis process begins with P and S wave phase picking using seismograv software, followed by origin time determination using the Wadati diagram method. The 2D dan 3D Grid Search method was used to calculate the position of the earthquake hypocenter by dividing the search area into grids and searching for the smallest RMS value. The results of the relocation calculation obtained the hypocenter point of the earthquake at latitude 4.50°N, longitude 76.0340°W with a depth of 60 km. Although there are differences with USGS data, the level of agreement of the calculation results is relatively high. This research contributes to further understanding of earthquakes in the study area and can be the basis for improving disaster mitigation.
Investigasi Akuifer Air Tanah Menggunakan Metode Geolistrik Vertical Electrical Sounding (VES) Konfigurasi Schlumberger di Kelurahan Randuacir, Kecamatan Argomulyo, Kota Salatiga, Jawa Tengah, Indonesia Sidik, Firdos Bahar; Ghoni, Alfito Abdhul; Ulhaq, Latief Dhiyya; Danuputra, Dzaki Aziz; Aprillarosanti, Perla Hanun; Sakinah, Triya Illmi; Pangestu, Farizki Budi
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 3 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i3.21156

Abstract

Penelitian ini bertujuan untuk mengidentifikasi akuifer air tanah di Desa Randuacir, Kecamatan Argomulyo, Kota Salatiga, Jawa Tengah, menggunakan metode geolistrik Vertical Electrical Sounding (VES) dengan konfigurasi Schlumberger. Pengukuran dilakukan di tujuh titik dengan bentangan kabel 600 m dan interpretasi kedalaman hingga 200 m. Hasil interpretasi menunjukkan adanya akuifer dangkal pada kedalaman 6–38 m, dengan ketebalan lapisan berkisar antara 9 hingga 32 m di lima titik (GL-1, GL-2, GL-4, GL-6, dan GL-7). ). Akuifer dalam teridentifikasi pada kedalaman lebih dari 100 m, khususnya pada GL-1 (>140 m), GL-2 (>151 m), GL-4 dan GL-6 (>116 m), dan GL-7 (> 101 m). Litologi dominan terdiri dari breksi laharik, pasir, dan lempung berpasir, dengan lapisan breksi tebal yang berperan sebagai akuitar. Temuan ini memberikan wawasan berharga untuk mendukung perencanaan pembangunan perumahan nasional melalui identifikasi lokasi pengeboran air tanah yang optimal
Co-Authors Aprillarosanti, Perla Hanun Danuputra, Dzaki Aziz Febrian, Muhamad Raihan Putra Fitrinova, ⁠Safina Ghoni, Alfito Abdhul Khumairo, Savira Zahrul Laksono, Risaldi Fauzan Muhlisin, Haris Nasution, Jihan Syafina Nurkholijah, Ekasari Pangestu, Farizki Budi Ramadeo, Muhammad Gilang Sakinah, Triya Illmi Ulhaq, Latief Dhiyya Wulandari, Maria Diyah Ayu