The vent of the mud volcano is reported to have shifted a number of times in the past. The mud volcano's activity is limited to quiet pulsating extrusion of pure gray mud accompanied by gas bubbling. Dark-colored streaks, which appear to be oil film, sometimes accompany the extruded mud. Gas was sampled in April 1998. The northern coastline is dominated by a rocky shoreline, with the sandy beach limited to the southern part of the island.
Settlements proliferate in the area fronted by the sand beach.
Like in the other islands, shore erosion seems to be very active. Beach attrition has already affected a number of houses and the barangay hall. Agriculture is done in woody areas. There is a sizeable coconut plantation. Fresh water is present in the form of shallow groundwater.