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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) Wahana Fisika : Jurnal Fisika dan Terapannya Jurnal Geosaintek
Tri Kusmita
Universitas Bangka Belitung
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Analisis Spasial Zona Risiko Gempabumi Berdasarkan Intensitas Seismik dan Peak Ground Acceleration (PGA) di Provinsi Bengkulu Periode 2012–2021 Farika, Nurahmi; 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.v6i01.3818

Abstract

Bengkulu Province is characterized by high seismic activity due to the influence of complex regional tectonic systems, which necessitates a comprehensive assessment of earthquake risk to support effective disaster mitigation. This study aims to delineate earthquake risk zones in Bengkulu Province based on Peak Ground Acceleration (PGA) and earthquake intensity. The analysis utilizes earthquake data recorded between 2012 and 2021 with magnitudes ≥ 3 and focal depths ranging from 0 to 100 km. Earthquake magnitudes originally reported as Mb, Mw, and Ms were converted to a uniform magnitude scale, namely surface wave magnitude (Ms). PGA values were calculated using the Gutenberg–Richter and McGuire empirical models, while earthquake intensity was estimated using an empirical relationship between surface wave magnitude and intensity. The results indicate that PGA values in Bengkulu Province range from 10 to 510 gal, with corresponding earthquake intensities varying from III to IX–X on the Modified Mercalli Intensity (MMI) scale. The highest earthquake risk is identified in Seluma Regency, whereas other regions exhibit low to moderate risk levels. The integrated spatial analysis of PGA and earthquake intensity provides a representative earthquake risk zonation that can serve as a scientific basis for earthquake mitigation planning and the implementation of seismic-resistant building design in Bengkulu Province.
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 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 Oktavia Oktavia 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