 Unsolidified areas of magmatic underplating (a magma chamber) may feed magma to volcanoes.In the Rajmahal Traps, there is a 10–15 km thick igneous layer at the base of the crust beneath this area.The thickness of the layer is different in various parts of the area; it is in the center, where the thickness is the greatest, where it is possible that the magma is being fed to the Rajmahal Traps up above.