Seismic Vulnerability Index Analysis Using the HVSR (Horizontal to Vertical Spectral Ratio) Method in Nagari Malampah, Tigo Nagari District, Pasaman Regency. PoP : Pillar of Physics [Internet]. 2026 Apr. 30 [cited 2026 May 15];19(1):89-97. Available from: https://pop.ppj.unp.ac.id/index.php/pop/article/view/31