Mapping of Landslide Potential Zone with FRM Method and Mitigation in Ayah, Kebumen Regency

Abstract

Landslides phenomena occur yearly in Ayah sub-district and various factors persist in the future cause these landslides. The Frequency Ratio Method is one approach to mapping landslide potential. It involves direct data collection of potential landslide points in the field. This method uses parameters such as Lithology, slope, NDVI, Monthly Precipitation, and Land Use to calculate landslide potential. These parameters are overlaid with the frequency of potential landslide points in Ayah sub- district. The resulting frequency ratio value is classified into five potential landslide zones. The findings reveal that high values covering 10.97% and very high values covering 41.75% are distributed across almost all the settlements in Ayah Sub-district, except for the northern area. The high frequency value shows the dominance of steep slope, presence of weathered breccia and limestone lithology as well as agricultural land with fibrous roots and it is also related to the complex changes in land use, such as mining and clearing activities. This highlights the importance of taking preventive and escalation measures among the relevant stakeholders to minimize the impact of this landslide.