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All Journal Jurnal Fisika Unand Jurnal Fisika FLUX
Ratni Sirait
Universitas Islam Negeri Sumatera Utara, Indonesia
Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Analysis of Seismicity Level and Coulomb Stress Changes in the Central Sulawesi Region in 1996-2022 Lailatul Husna Lubis; Ratni Sirait; Dhiau Rahman Fikri
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 20, No 1 (2023): 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 | DOI: 10.20527/flux.v20i1.14273

Abstract

Central Sulawesi is an area that is prone to earthquakes. The movement of the Palu Koro Fault is the trigger for most of the destructive earthquakes in the Central Sulawesi region. This study aims to analyze seismicity based on the seismotectonic parameter b-value, analyze coulomb stress changes and based on the seismicity level analyze the risk of earthquakes in Central Sulawesi in the 1996-2022 range. This study uses data from the 1996-2022 earthquake catalog from the USGS catalog. Data from the USGS catalog was then processed using Zmap v6 based on MATLAB to obtain the b-value seismicity parameter using the maximum likelihood method. Data processing for coulomb stress is processed using MATLAB based Coulomb 3.4.2 software. Based on the results of the analysis, the b-value in zone 1 to zone 3 is 0.653 – 0.777. The results of the analysis of changes in coulomb stress obtained positive coulomb stress changes indicated by the red lobe with  a value of 1 to 8 bar and negative coulomb stress changes indicated by the blue lobe with a value of -1 to -8 bar. The results of the analysis of b-value and coulomb stress showed that the b-value obtained was relatively  low and correlated with a high level of change in coulomb stress. In general, earthquake-prone areas are located in the western and eastern parts of Central Sulawesi.
Pengaruh Nilai Ketahanan Tarik Terhadap Daya Regang Dalam Pembuatan Kertas Dari Bahan Baku Kulit Singkong dan Daun Nanas Mulia Ningsih; Ratni Sirait; Ety Jumiati
Jurnal Fisika Unand Vol 12 No 4 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.4.518-525.2023

Abstract

 Kertas dihasilkan dari bahan setengah jadi (pulp) yang mengandung selulosa. Bahan baku yang digunakan kulit singkong dan daun nanas, karena mengandung selulosa yang tinggi diatas 40%. Tujuan penelitian untuk mengetahui karakteristik kertas dan variasi komposisi terbaik kertas dari kulit singkong dan daun nanas. Metode pembuatan pulp menggunakan proses soda. Variasi berat sampel A (80:20%), B (60:40%), C (40:60%) dan D (20:80%). Kulit singkong dan daun nanas dipanaskan menggunakan hot plate dengan penambahan NaOH 1,5% dengan suhu 100˚C. Proses pemutihan menggunakan larutan H2O2 10%. Hasil karakterisasi kertas pada sampel menunjukkan bahwa nilai uji ketahanan tarik sampel A bernilai 0,2567 MPa, B bernilai 0,4854 MPa, C bernilai 1,3127 Mpa dan D bernilai 1,4322 MPa dan daya regang sampel A sebesar 0,70%, B sebesar 0,86%, C sebesar 1,69%, dan D sebesar 2,05%. Berdasarkan data menunjukkan bahwa sampel D yang terbaik dan telah memenuhi kertas cetak C SNI 14-0937-2005 dalam pembuatan kertas.         
Co-Authors Dhiau Rahman Fikri Ety Jumiati Lailatul Husna Lubis Mulia Ningsih