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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS JAGAT (Jurnal Geografi Aplikasi dan Teknologi) Jurnal Rekayasa Geofisika Indonesia Jurnal Rekayasa Geofisika Indonesia
Jamhir Safani
Dept. Of Geophysical Engineering, Faculty Of Mathematics And Natural Sciences, Universitas Halu Oleo
Agriculture, Biological Sciences & Forestry Astronomy Computer Science & IT Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology Physics Other

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Journal : indonesian journal of applied physics

 1 
A Weighted Average of Multiple Inversions of Rayleigh Wave Dispersion Curve Using Particle Swarm Optimization for Geotechnical Site Characterization Jamhir Safani; Rezki Wirawan; Al Rubaiyn Rubaiyn; Mohd Nawawi; Toshifumi Matsuoka
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 2 (2023): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i2.77921

Abstract

Shear wave velocity is an important parameter in geotechnical engineering for studying liquefaction, finding bedrock for the basement of a building, and figuring out the presence of subsurface cavities. This study aims to develop and evaluate the accuracy of the multiple inversions by the Particle Swarm Optimization (MI-PSO) algorithm with a weighted average solution. This algorithm is applied to Rayleigh wave dispersion data for geotechnical site characterization. Two synthetic models, the HVL model and the complex model (i.e., a combination of models with LVL and HVL characteristics), are used to conduct algorithm tests. These synthetic models replicate subsurface characteristics that are frequently encountered in geotechnical cases. Synthetic data tests show that the MI-PSO algorithm with a weighted average solution works excellently. The MI-PSO technique with a weighted average solution resolves the model better than the conventional average solution. When applied to two field data sets, the MI-PSO algorithm with a weighted average solution can delineate target models that are consistent with the qualitative interpretation based on the observed dispersion curve characteristics.
Estimation of Tsunami Hazard and Evacuation Sites using The Cornell Multigrid Couple Tsunami Method in South Button Regency Ilham Ilham; Jamhir Safani; Muliddin Muliddin; Teguh Sulistian; Sorja Koesuma
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 1 (2025): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i1.97008

Abstract

The 1992 earthquake and tsunami in the Flores Sea proved that the tsunami impacted the people of the South Buton Region. This research aims to map tsunami hazards and estimate evacuation routes and sites in the South Buton Regency. These evacuation routes and sites are very crucial for disaster preparedness and reducing the risk of tsunami disasters. This research simulates the tsunami wave hazard from the 1992 Flores earthquake using the Cornell multigrid coupled tsunami (COMCOT). We designed the study area in five layers and seven sublayers, encompassing 13 villages on the coast of South Buton Regency. The research generated seven tsunami hazard maps based on the number of existing sublayers, each equipped with evacuation routes and locations. In general, the seven study areas have two tsunami hazard levels: a hazard level with an inundation height of less than 0.5 m and a hazard level with an inundation height of 0.5–3 m. The tsunami inundation distance for the height of 0.5-3 m varies. The shortest inundation distance is 5–33 m in Lakambau and Laompo Villages, while the farthest distance is 57–98 m in Katampe, Lamaninggara, and Molona Villages. Apart from that, the tsunami wave arrived around 35–45 minutes after the earthquake. The fastest arrival time is 35 minutes in Bahari Village, which is closest to the source of the tsunami. The results of the study recommend 17 temporary evacuation sites (TES) and 7 final evacuation sites (FES) in the research area.
Co-Authors Al Rubaiyn Al Rubaiyn Andre Nico Carli Silalahi Annisa Tiara Saputri Anshari, Erwin Asniar Asniar ILHAM ILHAM Ilham Ilham Irawati Irawati Khairul Anwar La Hamimu Mohd Nawawi Muhammad Ichsanul Akbar Natsir Muhammad Nur Ahsan Zakir Muliddin Nur Salam Nursinta Atsaniyah Misquita Rezki Wirawan Rudin Sorja Koesuma Stefanus Indra Fernando Darius Suryawan Asfar Syafira Mpuhu Syamsul Haraty Syamsul R Haraty Syamsul Razak Haraty Teguh Sulistian Tian Aprilia Aksa Mahadi Toshifumi Matsuoka Wa Ode Nurfadilah Wahyudhy