Landslide Disaster Mitigation Strategies Using Interpretive Structural Modeling in Talamau District, West Pasaman Regency

Rizki Amelia Sasqia Putri; Eri Barlian; Iswandi Umar; Ratna Wilis; Edward Saleh

doi:10.33394/j-ps.v14i4.22699

Authors

Rizki Amelia Sasqia Putri Universitas Negeri Padang
Eri Barlian Universitas Negeri Padang
Iswandi Umar Universitas Negeri Padang
Ratna Wilis Universitas Negeri Padang
Edward Saleh Universitas Sriwijaya

DOI:

https://doi.org/10.33394/j-ps.v14i4.22699

Keywords:

Landslide, Landslide susceptibility, Disaster mitigation, Interpretive structural modeling, Talamau district

Abstract

Landslides are a recurring hazard in Talamau District, West Pasaman Regency, affecting communities, settlements, and infrastructure. This study describes recorded landslide occurrences, maps modelled susceptibility for 2015 and 2025, and structures mitigation elements using Interpretive Structural Modeling (ISM). Susceptibility was modelled by integrating slope, rainfall, soil type, geology, and land-use/land-cover (LULC) through a GIS-based weighted overlay. The physical-factor inputs were held constant between the two model runs, while LULC was varied; therefore, the comparison represents changes in modelled susceptibility associated with the LULC input rather than independently verified changes in landslide probability. The area classified as highly susceptible was 14,942.25 ha (36.63%) in 2015 and 16,174.17 ha (39.65%) in 2025. These outputs have not been validated against an independent, spatially referenced landslide inventory. The ISM assessment used eight mitigation elements and a Structural Self-Interaction Matrix agreed upon by three professors during a joint discussion on 3 August 2026. Applying transitive closure to the reachability matrix derived from the reported SSIM yielded E4 as the independent element and E1, E2, E3, E5, E6, E7, and E8 as linkage elements under the stated DPD cut-off. These ISM results describe expert-assessed structural relationships and do not demonstrate the effectiveness of interventions in practice.

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