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Analisis Seismisitas dan Percepatan Tanah Maksimum untuk Evaluasi Risiko Gempabumi di Pulau Bali Periode Tahun 1980 - 2023 Adelia Wahyu Anjani; Winardi Tjahyo Baskoro; I Putu Dedy Pratama; I Nengah Artawan; Ni Luh Putu Trisnawati; I Wayan Supardi
Kappa Journal Vol 10 No 1 (2026): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v10i1.32793

Abstract

Bali Island is located in an active tectonic zone due to the meeting of the Indo-Australian and Eurasian Plates, thus experiencing significant seismic activity. This study aims to analyze the seismicity characteristics, distribution, and magnitude of peak ground acceleration (PGA), and evaluate earthquake risk in Bali Island. Earthquake data for the period 1980–2023 were analyzed based on spatial and temporal distributions and the Gutenberg-Richter equation to assess the relationship between earthquake frequency and magnitude. The analysis results show that Bali's seismicity is dominated by shallow earthquakes (<60 km) with moderate magnitudes (4.5 ≤ M < 6.0) to large magnitudes (M ≥ 6.0). The highest earthquake density is in the Central and Eastern regions of Bali with an earthquake density reaching 0.02 events/km². PGA values ​​range from low to exceed 0.4 g, especially in the Central and Southeast regions associated with active faults and the Southern subduction zone. These findings provide an important basis for spatial planning, earthquake-resistant building structure design, and earthquake risk mitigation strategies on the island of Bali.
Analisis Laju Dosis Radiasi di Area Ruang CT_Scan di Instalasi Radiologi RSU Bali Mandara Else Putri Ayu Prameswari; Gusti Ngurah Sutapa; I Gusti Agung Ayu Ratnawati; Ni Nyoman Ratini; I Nengah Artawan; Ni Luh Putu Trisnawati
Kappa Journal Vol 8 No 2 (2024): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i2.25211

Abstract

Research has been carried out on radiation dose rate analysis in the CT-SCAN area of the radiology room at RSU Mandara Bali. The data used in this research is quantitative data observed from the radiation rate from the CT-SCAN aircraft. This study aims to determine the radiation dose rate in the radiology area and its rationalization based on regulations regarding radiation NBD (dose limit values) that apply to occupational safety and health. The research data is the actual radiation dose rate determined from the dose rate and calibration factors. The results of data calculations show that the highest dose rates are respectively at T2, 30 cm, 50 cm and 100 cm (door) with values of 1.95, 0.94 and 0.05 μSv/year, while the lowest dose rates are respectively at T4, 30 cm, 50 cm and 100 cm (waiting room) with values of 0.08, 0.06 and 0.05 μSv/year. The research results show that the dose rate at each measurement point is still considered safe for radiation workers where the NBD received is still below 20 μSv/year, while the dose rate is classified as safe for the general public at measuring distances of 50 cm and 100 cm, where the NBD received is below 1 μSv/year assuming the community concerned acts as a patient or patient's family with an interest in the radiology room area.
Analysis of Radiation Dose Received by Radiation Workers With Physical and Biological Dosimeters in The Radiology Unit of Sanjiwani Hospital Gde Ari Mas Janudinata; Gusti Ngurah Sutapa; I Gde Antha Kasmawan; Ida Bagus Made Suryatika; I Nengah Artawan; Ni Luh Putu Trisnawati
Kappa Journal Vol 9 No 1 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29539

Abstract

This study aims to evaluate the impact of radiation exposure on the health of radiation workers at RSUD Sanjiwani Gianyar over the past five years. The evaluation was conducted through a physical approach, measuring radiation doses using Thermoluminescent Dosimeter (TLD), and a biological approach by analyzing the total leukocyte count and its components, namely neutrophils, lymphocytes, monocytes, and eosinophils. The results showed that the highest radiation dose was received by radiology specialists at 0.921 mSv, followed by medical physicists at 0.905 mSv, and radiographers at 0.894 mSv. This variation reflects differences in radiation exposure levels based on each profession's tasks and positions. Leukocyte and component analysis indicated that all values were within normal ranges. Although statistical tests showed significant differences in neutrophil levels between professions, overall radiation doses and leukocyte levels were within the safe limits set by PERKA BAPETEN No. 4 of 2013. The findings underline that radiation protection measures at RSUD Sanjiwani have been effective in minimizing health risks from radiation exposure. However, regular dose monitoring and health evaluations are necessary to ensure long-term protection for radiation workers.  
Analisis Perubahan Garis Pantai Menggunakan Citra Satelit Landsat 8 dengan Metode Linear Regression Rate di Wilayah Pesisir Kecamatan Kuta Selpia Purba; Winardi Tjahyo Baskoro; Tomy Gunawan; I Nengah Artawan; I Gusti Agung Putra Adnyana; I Nengah Sandi
Kappa Journal Vol 9 No 2 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i2.29955

Abstract

Coastal areas are dynamic environments and are vulnerable to natural processes and human activities, making regular monitoring important for sustainable management. This study analyzes coastal changes along the Kuta coastal area, which includes Pantai Jerman, Kuta, Legian, and Seminyak, using Landsat 8 satellite imagery through the application of the NDWI analysis and the Linear Regression Rate (LRR) method over the period 2014–2022. The NDWI is derived using Band 3 (green) and Band 5 (near-infrared) to accurately classify the boundary between water and land. The LRR method is employed to calculate the trend of coastal line shifts from temporal data, yielding a detailed estimation of the coastal displacement rate. The study results indicate that the Kuta coastal area undergoes changes dominated by mild accretion, with an average coastal shift of 1.50 m/year, while mild erosion occurs at an average of 1.30 m/year. Overall, the coastal area experienced an accretion of 9.52 ha and an erosion of 4.55 ha.
Co-Authors Adelia Wahyu Anjani Adnyana, I Gusti Agung Putra Else Putri Ayu Prameswari Gde Ari Mas Janudinata Gusti Ngurah Sutapa I Gde Antha Kasmawan I Gusti Agung Ayu Ratnawati I Nengah Sandi I Putu Dedy Pratama I Wayan Supardi Ida Bagus Made Suryatika Ni Luh Putu Trisnawati Ni Nyoman, Ratini Selpia Purba Tjahyo Baskoro, Winardi Tomy Gunawan