IDENTIFICATION OF SUBSURFACE LAYERS USING THE SEISMIC REFRACTION METHOD IN THE TABIANG BARASOK AREA. PoP : Pillar of Physics [Internet]. 2026 Apr. 30 [cited 2026 May 15];19(1):27-34. Available from: https://pop.ppj.unp.ac.id/index.php/pop/article/view/19