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Analisis Spasial Respon Bendungan terhadap Model Peak Ground Acceleration (PGA) Berdasarkan Karakteristik Mikrotremor, Geologi Regional dan Amatan Instrumentasi pada Bendungan Sermo Kulonprogo Nugroho Budi Wibowo; Arif Gunawan
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i02.4972

Abstract

This study is a comprehensive-descriptive analysis elaboration to seismic hazards on Sermo Dam, while in terms of microtremor characteristic (PGA model), its regional geology and observation of instrumentation on it. Sermo Dam is the only one water resources infrastructure which lies in The Yogyakarta Province at time of earthquake disaster happened on May 2006. Basic theories used in this case are HVSR methods, determining sediment thickness, and Kanai Method for Maximum Ground Acceleration, Then, based on these we can analyze characteristics of responsiveness damin the form of local spatial region focused by amplitude (A), dominance frequency (fo), time period (T), sediment thickness (H) and Peak Ground Acceleration (PGA) based on microtremor approarch with seismograph TDS 303S. Besides, by an analysis on regional geology that can be obtainable the characteristic of Sermo Dam foundation which lies on the Old Andesite (Kebo Butak) Formation. They are relatively robust when subjected to seismic vibration of middle class to below (less than 7 Richter scale on design). Also it has some declining periodic trends by main dam whereas there is still in the initial stage of design tolerance. The final result is zoning classification of damagepotential with: (1) region by PGA values of 0.04≤ a <0.15g which they are minor impact damage on their buildings; (2) region by PGA values of 0.15≤ a <0.34g which they are medium impact damage on their buildings. The damage level is comparable by inclining of filler material thickness at damsite.
Pemetaan sebaran nilai Vs30, faktor amplifikasi tanah, dan peak ground acceleration wilayah Bantul Timur Ahdian Azri Bustari; Nugroho Budi Wibowo
Cakrawala Vol 1, No 2 (2022): Desember
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/cakrawala.v1i2.1436

Abstract

Telah dilakukan penelitian mengenai pemetaan sebaran nilai Vs30, faktor amplifikasi tanah, dan peak ground acceleration (PGA) di wilayah Bantul Timur dengan daerah kajian berada pada koordinat -7.9083496664 s/d -7.9667413705 LS dan 110.3772617315 s/d 110.4509050001 BT. Penelitian ini bertujuan untuk menganalisis dan memetakan sebaran nilai Vs30, site class, faktor amplifikasi tanah, PGA batuan dasar, dan PGA permukaan di wilayah Bantul Timur. Metode yang dilakukan dalam penelitian ialah menggunakan metode pengolahan data sekunder yang bersumber dari Peta Geologi Lembar Yogyakarta, USGS, DEMNAS, dan Data RSA Desain Spektra Indonesia Kementerian PUPR dengan software Surfer dan Global Mapper untuk menghasilkan peta. Hasil dari penelitian ialah berhasil dibuatnya peta sebaran nilai Vs30 dan site class dengan rentang nilai dari 240 – 750  m/s dan klasifikasi tanah sedang serta tanah sangat padat dan batuan lunak, peta faktor amplifikasi tanah dengan rentang nilai 1.5 – 4 s, peta PGA batuan dasar dengan rentang 0.586 – 0.634 g, dan peta PGA permukaan dengan rentang nilai 0.9 – 2.4 g.
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; Mochamad Aryono Adhi; Nugroho Budi Wibowo; Desi Mustami Limayukha Desi Mustami Limayukha; Elsa Fadlika Widyantari Elsa Fadlika Widyantari; Billqis El Farsiyyi Bilqis El Farsiyyi; Ilqia Rahma Ilqia Rahma
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran 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.