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All Journal Journal of Science and Applicative Technology Indonesian Physical Review
Setiawan, Muhamad Ragil
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Mineralogical Characteristics and Critical Stress Variation in Rock Samples from Bukit Kunyit, Bandar Lampung Setiawan, Muhamad Ragil; Hilman, Zaki; Haqiqi, Rian Bayu; Farishi, Bilal Al
Journal of Science and Applicative Technology Vol. 9 No. 1 (2025): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v9i1.2026

Abstract

Mineralogy is essential for understanding rock formation processes and their physical properties, including critical stress. Critical stress values can be estimated using unconfined compressive strength (UCS) measurements, which depend on the modulus values of the minerals present. This study explores the mineralogical characteristics of rock samples from Bukit Kunyit, Bandar Lampung City, and Lampung through X-ray diffraction (XRD) and petrographic analysis. Macroscopic observations revealed two visually distinct rock samples: one with a bright color (Sample 1) and another with a darker hue (Sample 2). Despite these color differences, XRD analysis showed that both samples have the same mineral composition, including Anorthoclase, Cristobalite, Tridymite, and Muscovite, indicating a felsic (silica-rich) nature. Differences were noted in the crystallographic forms of Muscovite and Quartz content, with Sample 2 having a higher Quartz concentration. These mineralogical variations correlate with the observed differences in critical stress, with Sample 1 exhibiting a lower critical stress (20.98 MPa) than Sample 2 (35.05 MPa).
LANDSLIDE VULNERABILITY ANALYSIS BASED ON THE SEISMIC VULNERABILITY INDEX USING THE HVSR MICROTREMOR METHOD ON CLIFF AREAS IN HANURA VILLAGE, TELUK PANDAN DISTRICT, PESAWARAN REGENCY Permanasari, Ikah Ning Prasetiowati; Ba’asyir, Indi Nurazizah; Setiawan, Muhamad Ragil; Pardede, Indra; Monica, Yeli
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.484

Abstract

Way Ratai Road in Pesawaran Regency connects tourist areas managed by the Lampung Provincial Government. This road has cliffs with steep slopes, which have the potential to cause landslides. This research is very important because Way Ratai road is the only access road to Pesawaran beach tourism which is the main tourist destination of Lampung Province. Moreover, Way Ratai road is also the only access road connecting to the provincial capital of Bandar Lampung. This research was conducted to determine the soil vulnerability to seismic vibration on two cliffs around Way Ratai Road, Teluk Pandan District, Pesawaran Regency. The method used was microtremor signal recording with the Horizontal Vertical to Spectral Ratio (HVSR) method to determine the amplification factor (), dominant frequency (), sediment thickness (H), and seismic vulnerability index (Kg). The first cliff's measurement and data processing results showed an amplification factor () value of 2.74 - 3.70, a dominant frequency () of 3.75 - 4.56 Hz, a sediment thickness (H) of 14.09 m, and a seismic vulnerability index (Kg) of 2.39 m²/s. On the second cliff, the results showed an amplification factor () value of 2.27 - 3.40, a dominant frequency () of 3.54 - 7.20 Hz, a sediment thickness (H) of 9.33 m, and a seismic vulnerability index (Kg) of 1.84 m²/s. In term of seismic vibration, both cliffs, prone to landslides, have high stability against seismic vibrations. In the event of a landslide on these two cliffs, the estimated slip surface on the first cliff would be translational, and the second cliff would be a combination of translational and slight rotational, with an estimated volume of soil that could potentially slide on the first cliff is 30,492.16 m³ and on the second cliff, it is 27,188.92 m³.
Co-Authors Ba’asyir, Indi Nurazizah Farishi, Bilal Al Haqiqi, Rian Bayu Hilman, Zaki Ikah N. P. Permanasari Indra Pardede Monica, Yeli