 Of all the measurements taken during the post-tsunami survey, the highest runup heights () were seen on the island behind a beach, where hibiscus and pandanus plants, and large coconut trees were mangled and uprooted up to from the shore.The (sea floor) bathymetry in the area supported a proposition that a canyon slope failure or an underwater landslide may have contributed to or focused the tsunami energy at that location.Nineteen farmers and one prisoner were killed there, but the deep water port of Cilacap (just to the east) was protected by the island, although one large moored vessel made ground contact during the initial withdrawal.