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All Journal Civil Engineering Journal Journal of Civil Engineering and Vocational Education
Agung, M. Darma
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Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Transportation

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Natural Frequency of Liquefaction Potential Based on Soil Investigation and Microtremor Observation Results Putra, Rusnardi Rahmat; Kiyono, Junji; Zhang, Zhenghu; Vanapalli, Sai; Agung, M. Darma
Civil Engineering Journal Vol. 11 No. 8 (2025): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-08-02

Abstract

This study aims to identify the natural frequency threshold for liquefaction potential by comparing four assessment methods at 54 identical sites in Padang, Indonesia. Methods include: (1) safety factor calculations from soil investigation results (CPT and SPT) applying the 2009 Padang earthquake's peak ground acceleration as input for cycling stress ratio; (2) natural frequency measurements at the surface using microtremor single observations; (3) liquefaction potential assessment through vulnerability index; and (4) analysis of historical liquefaction events from the September 30, 2009 Padang earthquake documented in two previous research papers. The analysis focused on soil depths ranging from 1-4 m. Findings reveal that sites with natural frequencies exceeding 0.40 Hertz remain safe from liquefaction, while sites with frequencies between 0.20-0.39 Hertz demonstrate significant liquefaction potential. This research contributes to the field by establishing a clear correlation between measurable natural frequency thresholds and liquefaction risk, providing engineers and urban planners with a more accessible parameter for preliminary risk assessment. Integrating multiple assessment methods at identical sites enhances the reliability of the identified frequency thresholds, offering a more comprehensive approach to liquefaction hazard mitigation in earthquake-prone regions.
Socialization of Earthquake Friendly House Planning with a Theme "Nagari is Resilient to Earthquake Disasters" in Nagari Kajai, West Pasaman Regency Putra, Rusnardi Rahmat; Saputra, Dezy; Agung, M. Darma
CIVED Vol. 11 No. 1 (2024): March 2024
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v11i1.520

Abstract

West Pasaman Regency is an area that has a fairly large threat of earthquake and tsunami disasters. The 6.2 Mw West Pasaman earthquake that occurred on February 25 2022 was quite large and resulted in 25 people dying, 465 people being injured and at least 16,000 people being displaced. This earthquake was located on the slopes of Mount Talamau at a depth of 10 km which was triggered by the activity of the Semangko fault fault, precisely in the unmapped Talamau segment. Apart from the loss of life, another impact caused by this earthquake disaster was the large number of collapses in people's houses. People's houses that have simple construction have a greater potential for collapse compared to other buildings whose designs comply with existing regulatory standards. In general, people's houses are only built by builders who do not know the technicalities of building earthquake-friendly houses. Builders are the main key to the quality of housing construction in society, so more attention is needed from people who are experts in their field because it is in their hands that the structural strength of a house is built. The community service organized by the Institute for Research and Community Service (LP2M) Padang State University together with several Civil Engineering lecturers aims to channel their knowledge to the community, especially to builders to increase knowledge in building earthquake-friendly houses. This activity is also expected to reduce damage in the future if an earthquake occurs, which has been designed according to standards applicable in Indonesia. From the results of interviews with several builders and local residents, it turns out that their knowledge of the basic techniques for building earthquake-friendly houses is still limited. So that this outreach can provide a useful contribution to builders' knowledge of the basics of earthquake-friendly house construction.
Co-Authors Kiyono, Junji Putra, Rusnardi Rahmat Saputra, Dezy Vanapalli, Sai Zhang, Zhenghu