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All Journal Jurnal Fisika Unand Jurnal Geosaintek JOURNAL ONLINE OF PHYSICS Journal of Applied Geospatial Information Journal of Appropriate Technology for Community Services Jurnal Riset Fisika Indonesia Dharma Pengabdian Perguruan Tinggi (DEPATI) Jurnal Geosaintek
Tri Kusmita
Universitas Bangka Belitung
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The Temporal Variation b-Value Temporal Variation of b-Value in Bengkulu Province Using the Maximum Likelihood Method (Earthquake Case Study 2012-2022) Sari, Elmi Permata; Kusmita, Tri; Kurniawan, Widodo Budi
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.4389

Abstract

Bengkulu Province is a region of high seismicity influenced by the complex interaction between the offshore subduction zone along the western margin of Sumatra and active strike-slip fault systems on land. This study investigates the temporal variation of earthquake b-values in Bengkulu Province during the period 2012–2022 using the Maximum Likelihood approach. The analysis focuses on temporal changes in the frequency–magnitude distribution and the evolving characteristics of regional seismicity. The results show clear temporal variations in b-values, indicating changes in the frequency–magnitude distribution of earthquakes over time. Variations in the a- and b-values reflect shifts in the seismicity characteristics within the framework of Bengkulu’s active tectonic setting, particularly the interaction between the Indo-Australian–Eurasian subduction system and onshore active faults. Overall, the results demonstrate that temporal changes in b-values represent the dynamics of regional seismicity in Bengkulu within an active subduction–fault tectonic framework.
Pengaruh Konsentrasi Kitosan Terhadap Karakteristik Bioplastik Selulosa Batang Pisang dengan Plasticizer Gliserol oktavia, oktavia; Puspita, Indah; Kusmita, Tri; Utami, Rizka
Jurnal Riset Fisika Indonesia Vol 6 No 01: Desember 2025
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v6i01.5196

Abstract

The development of bioplastics has continued to grow as an alternative material based on renewable natural resources. Cellulose is a natural polymer that is widely used as a raw material for bioplastics; however, cellulose-based bioplastics generally show limited mechanical stability and rigidity. Therefore, the addition of chitosan and glycerol is required to improve their characteristics. This study aims to determine the cellulose content and functional groups of banana stem cellulose and to analyze the effect of chitosan concentration on the thickness, mechanical properties, and degradation rate of banana stem cellulose-based bioplastics using glycerol as a plasticizer. Bioplastics were synthesized by varying the chitosan concentration at 1%, 2%, 3%, and 4%. The results showed that the cellulose content of banana stems reached 93%, with the presence of –OH, –CH, and –CO functional groups. The variation in chitosan concentration affected the thickness, tensile strength, elongation at break, and degradation rate of the bioplastics. An increase in chitosan concentration resulted in a decrease in thickness and elongation, while tensile strength and degradation rate increased with higher chitosan content. These results indicate that chitosan concentration significantly influences the physical, mechanical, and degradation properties of banana stem cellulose-based bioplastics, demonstrating their potential as biodegradable materials.
Co-Authors Afni, Githa Nurvilia Akhmad Fadholi Al-Fariq Ismail Syam Alawiyah, Umi Andina Syafrina Anisa Indriawati Annisa Fatikasari Apriliazmi, Ilhafurroihan Aryanto, Liyana Asisah, Tina Dea Amelia, Dea Dea Septika Dhea Andesfa Saputri Dwi Puji Astuti Eddy Hermawan Eddy Hermawan Eri Gusnia Eri Gusnia Farika, Nurahmi Fathia, Suci Fatikasari, Annisa Fitri Afriani Githa Nurvilia Afni Gusnia, Eri Herman Aldila Hetty Triastuty Hidayat, Rizki Ilhafurroihan Apriliazmi Ilham Pribadi Indah Puspita, Indah Indriawati, Anisa Ivandi, Syachrul Julia Ambarwati Kamur, Sudarwin Kirbani Brotopuspito Lestari, Diani Liyana Aryanto Mardani Mardani Mardiyanto Mardiyanto Mardiyanto Maulinda, Reski Mursid Mursid Mursid Mursid Mutia, Rara Mz, Nasri Nasri MZ Octavia, Yoanda octavia, yoanda wanda Pribadi, Ilham Putri Hardianti Rara Mutia Reski Maulinda Reza Firdaus Rita Desiasni Rizki Hidayat Rusdianto Rusdianto Rusdianto Rusdianto, Rusdianto Santya, Indah Saputri, Riny Sari, Elmi Permata Septika, Dea Siska Oktaviyani Suci Fathia Supriyanto Rohadi Surya Ningsih Susanti Susanti Syachrul Ivandi Talitha Talitha Talitha, Talitha Triani Triani Triani, Triani Umi Alawiyah Umi Alawiyah Utami, Rizka Widodo Budi Kurniawan Widyaningrum, Yekti Yekti Widyaningrum Yekti Widyaningrum Yuant Tiandho