Seismic Vulnerability Index Analysis Using the HVSR (Horizontal to Vertical Spectral Ratio) Method in Nagari Malampah, Tigo Nagari District, Pasaman Regency. PILLAR OF PHYSICS, [S. l.], v. 19, n. 1, p. 89–97, 2026. DOI: 10.24036/pvc23h20. Disponível em: https://pop.ppj.unp.ac.id/index.php/pop/article/view/31. Acesso em: 16 may. 2026.