Effects of hydrate on the stiffness of the hydrate bearing sediments in Ulleung BasinJung-Tae Kim, Chul-Wan Kang, Minhyeong Lee, Jin-seop Kim and Gye-Chun ChoE3S Web Conf., 205 (2020) 13005DOI: https://doi.org/10.1051/e3sconf/202020513005