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All Journal Physics Student Journal Jurnal Fisika FLUX Civil Engineering Journal
Alamsyah M. Juwono
Department Of Physics, Universitas Brawijaya, Malang, 65145,
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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STUDI ANALISIS PENENTUAN JENIS SESAR PENYEBAB GEMPA KEBUMEN 25 JANUARI 2014 DENGAN METODE PERGERAKAN AWAL GELOMBANG P Putri, Rizka Rahmatie Agusta; M. Juwono, Alamsyah; Rachman, Tri Deni
Physics Student Journal Vol 2, No 1 (2014)
Publisher : Department of Physics - Faculty of Science

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Abstract

Gempa Kebumen merupakan salah satu gempa yang memiliki episenter di daerah selatan Jawa dengan tingkat seismisitas tinggi yang memungkinkan terjadi gempa lagi pada daerah penelitian. Gempabumi ini dapat disebabkan oleh sesar normal, sesar naik, atau sesar mendatar. Salah satu metode untuk menentukan jenis sesar dari pemodelan bola fokus adalah dengan meneliti pergerakan awal gelombang P di mana ditentukan gerakan up dan down pada gelombang seismik yang terbaca dalam seismogram. Proses pengolahan data pada penelitian ini dilakukan dengan software Focal yang terdiri atas program Azmtak, Pman, dan PinV. Hasil dari pengolahan data menampilkan gempa Kebumen yang terjadi pada 25 Januari 2014 disebabkan oleh sesar turun yang memiliki strike = 2830, dip = 140, dan rake = -1050. Pola sesar yang dianalisa dalam penelitian ini adalah gempa utama pada 25 Januari 2014 dan gempa susulannya yang memiliki magnitudo lebih dari 4,5 SR. Sesar yang terjadi akibat dari aktivitas subduksi selatan Jawa. Kata kunci: Gempa Kebumen, sesar, focal mechanism, Azmtak.
Simulasi Pengaruh Ketebalan Elektroda Terhadap Potensial Elektrolit dan Molaritas Spesies Vanadium Redox Flow Battery (VRFB) Satria Pamungkas Panji Kumara; Irvan Fajar Hidayah; Silvi Hadila; Ervinka Felindia; Nikita Syaharani; Mauludi Ariesto Pamungkas; Kurriawan Budi Pranata; Alamsyah Mohammad Juwono; Muhammad Ghufron
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 19, No 1 (2022): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1078.552 KB) | DOI: 10.20527/flux.v19i1.11403

Abstract

Vanadium Redox Flow Battery (VRFB) is a relative new type of secondary battery that has ability as Energy Storage System (ESS) for renewable energy power plants such as solar cell. 2D VRFB single cell was modeled using COMSOL Multiphysics software and simulated numerically by using Nernst-Planck, secondary current distribution, tertiary current distribution and Buttler-Volmer principle. Simulation was conducted at 293,15 K, with electrode thickness variations of 1 mm (L1), 2 mm (L2), 3 mm (L3), 4 mm (L4) and 5 mm (L5). According to the simulation results, it is known that electrolyte potential in negative electrode is higher than positive electrode and the distribution is tend to decrease for all variations.  Surface concentration near collector is dominant during charging compare inlet position and the reverse phenomenon occur during discharging process. VRFB L1 show weak performance and VRFB L2 show the best performance in term of electrolyte potential and species molarity in the electrode surface.
Subsurface Analysis Using Microtremor and Resistivity to Determine Soil Vulnerability and Discovery of New Local Fault Adi Susilo; Alamsyah M. Juwono; Faridha Aprilia; Farizky Hisyam; Siti Rohmah; Muhammad Fathur Rouf Hasan
Civil Engineering Journal Vol 9, No 9 (2023): September
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2023-09-09-014

Abstract

Microtremor and geoelectrical resistivity surveys have been conducted in areas where the April 10, 2021, earthquake of 6.1 Mw caused the most damage. Wirotaman Village, Malang Regency, was one of the regions with the most extensive damage. This study aims to investigate the seismic vulnerability and subsurface conditions that result in severe damage at the research location. This study's Horizontal to Vertical Spectral Ratio Analysis (HVSR) curve was derived from the recorded microtremor signal in the frequency domain. The frequency parameter and amplification factor obtained from the curve are used to determine the seismic vulnerability index. In addition, a geoelectrical resistivity study with a dipole-dipole configuration was conducted at the site with the most extensive damage. The results of this study show the correlation between the results of the HVSR curve analysis and geoelectrical resistivity in determining the seismic vulnerability of an area. The results indicated that the high seismic vulnerability index value ranged from Kg= 12.0 to 18.0, with the most severe damage concentrated in the Southwest at SA 05 and SA 06. Based on the results of the geoelectrical survey, information was obtained that several points of damage to buildings at SA 05 (red circle) were on the same line, where this condition was associated with the possibility of new faults at that location. This microtremor and geoelectric resistivity investigation reveals thick sedimentary deposits with a high seismic vulnerability index and low resistivity. This study's findings can be utilized as a guide for micro zonation studies in research areas. This research contributes to the surrounding community in the form of disaster mitigation, where construction must avoid local fault positions that have been found to reduce the level of damage when natural geological disasters occur. Doi: 10.28991/CEJ-2023-09-09-014 Full Text: PDF
Co-Authors Adi Susilo Ervinka Felindia Faridha Aprilia Farizky Hisyam Irvan Fajar Hidayah Kurriawan Budi Pranata Mauludi Ariesto Pamungkas Muhammad Fathur Rouf Hasan Muhammad Ghufron Nikita Syaharani Rizka Rahmatie Agusta Putri Satria Pamungkas Panji Kumara Silvi Hadila Siti Rohmah Tri Deni Rachman