C. Dewi, I.W. Astika, G.H. Pramono
A sea of hot mud has been gushing from the ground in Sidoarjo, East Java, Indonesia since May 29th 2006 that caused economic, social, health and environmental impacts. Determining vulnerable area of hot mud volcano is important to provide information on the extent of the area affected by the hazard. The objective of this research is to assess mud volcano vulnerability within settlement area in Sidoarjo by using multi criteria evaluation method. Fuzzy Analytical Hierarchy Process (AHP) is used to handle imprecision and subjectiveness involved in expert knowledge. Having established Fuzzy AHP to obtain criterion performance, the spatial analysis was done by applying this performance to criterion layer to create vulnerability area. Performing assessment at confidence level of experts (at values 0.4, 0.6 and 0.8) and at expert attitude about their judgment (at values 0, 0.5 and 1) showed the highest sensitivity could be observed at confidence 0.4 and attitude 0. Then, the comparison of vulnerability map resulted from applying Fuzzy AHP method at 100% confidence level with impacted area prepared by BPLS showed that these two maps have different class of vulnerability. The result of multi criteria analysis showed that settlement areas located in impacted area were mostly categorized as high and moderate vulnerable class, while impacted area is categorized as high hazardous area. However, the surface area of the merged class of high and moderate from vulnerability analysis covered area was almost same with impacted area prepared by BPLS.
Faculty of Mathematics and Natural Science, Brawijaya University, Malang, East Java, Indonesia; Faculty of Agricultural Engineering, Bogor Agricultural University, Bogor, West Java, Indonesia; National Survey and Mapping Agency, Cibinong, West Java, Indonesia
