 The area is an active subduction zone, and lies along the interface of the Caribbean and South American Tectonic plates.Kick 'em Jenny is an undersea volcano north of Grenada, and there is also another less active volcano named "Kick ’em Jack" in the area.The shallow bank of the Grenadines extends from St Vincent to Grenada, and has a natural boundaries of the Tobago Trough to the east and the Grenada Trough to the west, where the depth increases rapidly.