Subsurface identification in the Surabaya and Waru segment areas using the Multichannel Analysis of Surface Waves (MASW) methodSandy Tri Gustono, Ari Sucipto, Dadang Permana and Dzikrullah AkbarE3S Web Conf., 464 (2023) 14005DOI: https://doi.org/10.1051/e3sconf/202346414005