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All Journal Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Desi Mustami Limayukha, Desi Mustami Limayukha
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Seismic Vulnerability Microzonation Based on Dominant Frequency and Amplification Using the HVSR Method in Wedi, Changewaro (Klaten) and Gendangsari (Yogyakarta) Desi Mustami Limayukha, Desi Mustami Limayukha; Adhi, Mochamad Aryono Adhi; Wibowo, Nugroho Budi; Bilqis El Farsiyyi, Billqis El Farsiyyi; Elsa Fadlika Widyantari, Elsa Fadlika Widyantari; Ilqia Rahma, Ilqia Rahma; Rahmania Sofyana Ulya, Rahmania Sofyana Ulya
Rekayasa Vol. 20 No. 2 (2022)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v20i2.9957

Abstract

The Yogyakarta region is prone to frequent earthquakes, highlighting the need for seismic vulnerability assessment and micro zonation analysis. This study aimed to evaluate the area's seismic vulnerability by utilizing microtremor methods to estimate dominant frequency, amplification, seismic vulnerability index, and shear wave velocity. Microtremor points were analyzed using the Horizontal Vertical Spectral Ratio method, with data processed through Geopsy software to obtain f0, A0, and H/V curves. The H/V curve was further inverted using Dinver software to derive ellipticity curves, ground profiles, and Kg values. The results revealed that the dominant frequency values ranged from 0.668 Hz to 18.271 Hz, with higher values prevalent. The soil types in the area were classified as type IV and type I, primarily consisting of older, hard sandy rocks and gravels. Amplification values ranged from 1.03 to 8.36, indicating low amplification levels and placing the area in zone 1. Kg values varied from 0.066 to 15.07 s²/cm, suggesting moderate seismic vulnerability. If an earthquake occurs, the region would experience shaking, though damage would be moderate. Vs30 values ranged from 179.64 m/s to 681.82 m/s, categorizing the soil as hard, dense, soft, or medium.
Site Effect Analysis in Prambanan District and Surroundings Using Shear Wave Velocity and Ellipticity Curve Method from Microtremor Data Rahmania Sofyana Ulya, Rahmania Sofyana Ulya; Adhi, Mochamad Aryono; Budi Wibowo, Nugroho; Desi Mustami Limayukha, Desi Mustami Limayukha; Elsa Fadlika Widyantari, Elsa Fadlika Widyantari; Bilqis El Farsiyyi, Billqis El Farsiyyi; Ilqia Rahma, Ilqia Rahma
Rekayasa Vol. 21 No. 1 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v20i2.9962

Abstract

The shear wave velocity (Vs) is a crucial parameter for determining subsurface layers by averaging the Vs value to a depth of 30 meters, known as Vs30. This study aims to analyze the subsurface soil layers, calculate the Vs30 value, and assess the potential seismic site classifications in Kapanewon Prambanan and its surrounding areas. The research utilizes secondary microtremor data from 27 observation points in the form of MSD files. The microtremor data was processed using Geopsy software with the HVSR method to generate an H/V curve. This curve was further analyzed with the Ellipticity Curve method via Dinver software to obtain the Vs profile at various depths. The findings suggest that the subsurface layers in Kapanewon Prambanan are predominantly composed of hard, very dense soil, soft rocks, and solid rocks, based on the Vs30 values. The Vs30 distribution across the region ranges from 267.857 m/s to 1675.977 m/s, classified into site categories A, B, C, and D. However, the majority of the area falls under site classes B and C. These classifications indicate that the regions under B and C have a relatively lower potential for significant earthquake wave amplification. Nonetheless, attention should still be given to areas categorized under sites D and E, particularly for earthquake disaster mitigation efforts. This detailed Vs30 analysis provides critical insights for seismic assessments, regional planning, and mitigation strategies in Kapanewon Prambanan.
Co-Authors Adhi, Mochamad Aryono Adhi Aryono Adhi, Aryono Bilqis El Farsiyyi, Billqis El Farsiyyi Budi Wibowo, Nugroho Elsa Fadlika Widyantari, Elsa Fadlika Widyantari Ilqia Rahma, Ilqia Rahma Nugroho Budi Wibowo Rahmania Sofyana Ulya, Rahmania Sofyana Ulya