from the University of the West Indies Seismic Research Centre observed nothing out of the ordinary at the surface above the volcano during an overflight on 25 July, and by 18:00 no activity was recorded. On 26 July the Alert Level was lowered to Yellow. Maritime exclusion zone The volcano is on the shipping route from St Vincent to Grenada. There is a Maritime Exclusion Zone monitored by the Seismic Research Centre of the University of the West Indies, Trinidad and Tobago. The zone normally encompasses a circle with a radius of from the centre of the volcano. Bubbles of volcanic gases can lower water density, creating a sinking hazard. This is marked on marine charts. During periods of high seismic activity, the zone is expanded to a radius. See also List of volcanoes in Grenada References Seamounts of the Caribbean Volcanoes of Grenada Seamounts of the Atlantic Ocean Submarine volcanoes Active volcanoes Former islands from the last glacial maximum