Observation of multi-hazards level base on geographical infomation system (ArcGIS) on Yogyakarta-Kebumen railway line

• Main Authors: Rika, Nuraini, Jeki, Trimarsturi
• Format: Conference Proceeding
• Language: English
• Subjects: Disasters; Dry season; Earthquakes; Floods; Geographic information systems; Geomorphology; Hazard assessment; Hazard identification; Landslides; Natural disasters; Rainy season; Subsidence; Tsunamis; Volcanic eruptions; Weighting methods
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0131341

Natural disasters are a series of events caused by nature, including earthquakes, floods, landslides, tsunamis, subsidence, volcanic eruptions and others. This research aims to analyze the level of disaster vulnerability in an area based on Geographical Information Systems (GIS). The natural disasters that will be studied in this research are earthquakes, floods, tsunamis, and subsidence. This research was conducted on the four disasters in the area around the southern route of the Yogyakarta - Kebumen railway. This study uses a geomorphological approach based on landscape analysis. The final output of this research will produce a tentative multi-hazard map. Making a tentative multi-hazard hazard map begins by identifying the hazard level of each disaster based on the hazard class using ArcGIS software. The overlay technique is used in the processing of the hazard map to physically unify the data from each different layer. Disaster hazard class consists of low, high, and medium hazard levels. A low hazard is indicated in green color level, a moderate hazard is indicated in yellow, and a high hazard is indicated in red. Areas or areas that are not prone to a disaster are marked in gray. The method used in the identification process is the scoring and weighting method. Scoring is carried out on each parameter that determines the vulnerability of each disaster. The scoring value for each hazard is a score of 1 for low hazard, a score of 2 for moderate hazard, a score of 3 for high hazard. Meanwhile, areas that are not prone to disasters are given a score of 0. The final scoring result will determine the level of vulnerability of each disaster. Furthermore, the weighting of each disaster is determined based on 2 event scenarios, namely during the rainy season and the dry season. The determination of the weight refers to the potential for each disaster to occur in an area based on the two scenarios. Then the weight of the four disasters will be multiplied by the final scoring result of each disaster. The results of this analysis are accumulated to produce a tentative multi-hazard level on the Yogyakarta - Kebumen railroad area based on 2 event scenarios. The multi-hazard analysis used was the actual multi-prone analysis. The tentative map will show how much potential for earthquakes, tsunamis, subsidence and flooding in the area based on 2 scenarios, namely during the rainy season and the dry season.