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Pangestu, Farizki Budi
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Humanities Computer Science & IT Education Industrial & Manufacturing Engineering 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.
Designing a Geo-Edu Park through Structural Landform Analysis: Insights from Teletubbies Hill, Indonesia Darmawangsa, Wahyu Ramadhan; Widagdo, Arif Surya; Lapian, Gianangel Emmanuela; Pangestu, Farizki Budi; Pintrandhita, Anwar Said
Advances in Tourism Studies Vol. 2 No. 1 (2024): Advances in Tourism Studies
Publisher : Centre for Tourism Studies and Journal Publication of Sekolah Tinggi Pariwisata Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ats.v2i1.51

Abstract

This study explores the geotourism potential of Teletubbies Hill in Wukirharjo Village, Yogyakarta, through detailed topographical and geomorphological mapping. Employing a terrestrial survey method using Total Station instruments, the research generates high-resolution elevation data to assess landforms and slopes shaped by ancient volcanic processes associated with the Semilir Supervolcano. Morphographic and morphometric analyses reveal that the site consists of structural hills with slopes ranging from 8% to 20%, categorized into two development zones based on slope steepness. The findings support the suitability of Teletubbies Hill for sustainable geotourism initiatives that combine education, recreation, and conservation. Proposed developments include the construction of a geological museum and an outdoor geological park to highlight the region's volcanic heritage and geological features. This integrated approach offers a framework for transforming underutilized landscapes into educational geotourism destinations. While the reliance on terrestrial methods limits broader geological context, future research could incorporate remote sensing and socio-economic feasibility assessments to enhance planning outcomes.
From Faults to Festivals: A Geotourism Strategy Based on Geological and Geophysical Analysis in Prambanan Pangestu, Farizki Budi; Darmawangsa, Wahyu Ramadhan; Pintrandhita, Anwar Said; Lapian, Gianangel Emmanuela; Widagdo, Arif Surya
Advances in Tourism Studies Vol. 2 No. 2 (2024): Advances in Tourism Studies
Publisher : Centre for Tourism Studies and Journal Publication of Sekolah Tinggi Pariwisata Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ats.v2i2.52

Abstract

This study explores the development of geotourism in the Prambanan region of Yogyakarta by integrating geological, geophysical, and cultural data to design a strategic geotrail. Located along the Opak Fault and rich in volcanic history, Prambanan features diverse geosites such as Tebing Breksi, Lava Bantal Berbah, and Candi Abang. Through a multidisciplinary methodology combining geological mapping, gravity surveys, and cultural site assessments, six key geosites were evaluated using Kubalikova’s framework. Tebing Breksi emerged as the most feasible site due to its rich pyroclastic breccia formations and cultural functions, while other sites showed moderate to high potential. Geophysical analysis using the Lacoste & Romberg gravitymeter revealed fault structures critical to infrastructure safety and disaster mitigation. The study proposes the development of integrated geotrails supported by educational panels, improved facilities, community involvement, and conservation strategies. By connecting geological significance with cultural heritage and local livelihoods, this research supports the sustainable enhancement of tourism infrastructure in Prambanan. The findings provide valuable input for policymakers, tourism planners, and educators, emphasizing the role of geoscience in destination development. Limitations include the need for deeper geotechnical and socio-economic impact studies. Future research may explore visitor engagement and smart tourism technologies for enriched geosite experiences.
Co-Authors Darmawangsa, Wahyu Ramadhan Fitrinova, ⁠Safina Khumairo, Savira Zahrul Lapian, Gianangel Emmanuela Muhlisin, Haris Nurkholijah, Ekasari Pintrandhita, Anwar Said Ramadeo, Muhammad Gilang Sidik, Firdos Bahar Widagdo, Arif Surya Wulandari, Maria Diyah Ayu