Abstract
Abstract. Butuan City lies along and is being transected by the Philippine Fault: Surigao Segment. As earthquakes occur more recently, the city is more vulnerable to earthquake hazards, especially soil liquefaction. With the city proper situated mostly on areas susceptible to soil liquefaction and with no constructive evacuation plan against this kind of hazard, it puts the city at risk. This problem highlights the importance of vulnerability assessment for the identification of the road networks that would be most optimal to use in occurrence of an earthquake and an earthquake induced liquefaction. With seven parameters to consider for the assessment, it would be easier to assess by using the pairwise comparison technique of the Analytical Hierarchy Process (AHP) and Geographic Information System (GIS). The analysis was performed by using AHP to assign weights to the parameters and using these weights to classify the road networks into vulnerability classes. The result of the analysis yielded to 34.87% of the road networks with low vulnerability, 65.09% has medium vulnerability and 0.03% are considered to be highly vulnerable. Majority of the road networks especially in the city proper exhibit medium vulnerability in terms of earthquake occurrences. With unavoidable chances that this kind of disaster would happen, these results would benefit the decision makers involved in disaster risk reduction.
Highlights
Eastern Mindanao is one of the seismically active areas in the Philippines because of the Philippine Fault and Philippine Trench, which are the main earthquake generators that can affect the area
Given that the study established seven different parameters to put into consideration when deciding an evacuation route, these parameters were evaluated by five (5) experts using the Analytical Hierarchy Process (AHP) Pairwise Comparison, in order to assign weights
It can be concluded that the decision of the five (5) experts in choosing the most optimal evacuation route should consider the roads proximity to an active fault line as the highest priority
Summary
Eastern Mindanao is one of the seismically active areas in the Philippines because of the Philippine Fault and Philippine Trench, which are the main earthquake generators that can affect the area. Butuan City lies along and is being transected by the Philippine Fault: Surigao Segment making it vulnerable to seismic hazards. The authors employed an AHP Pairwise Comparison as a decision-making tool and used a GIS-based Weighted Overlay Analysis to generate a vulnerability map. These techniques were implemented to assess the road networks in Butuan City and its accessibility in an occurrence of an earthquake. Butuan City is a highly urbanized city and the regional center of the Caraga Region, Mindanao, Philippines (Wikipedia, 2019) It has an area range of 81, 662 hectares or 816.62 km which is subdivided into 86 barangays and grouped into 13 districts. This study is concerned on which road networks of the city can still be accessible and can be used as an evacuation route after the occurrence of an earthquake and an earthquake induced liquefaction alongside with some parameters affecting an evacuation route
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