Resurgent doming occurred in the centre of the caldera, causing Miocene-age rocks (including diorites) to be exposed at its centre. A combination between this doming and uplift of the surrounding land of the Baja California peninsula raised Pleistocene sea deposits to over . The average pace of the uplift is . Hot springs exist in the area and the chemical and isotope characteristics indicate that a small amount of their water comes from magma, implying that a magma chamber still exists beneath La Reforma. Temperatures of the hot springs range from . Geothermal energy has been harnessed from Tres Virgenes for over ten years; currently, in Baja California Cerro Prieto and Tres Virgenes are the principal sources for geothermal energy, but a number of other sites on the peninsula could be used in the future for power generation.