Along historical eruptions have generally been basaltic in quality, with effusive characteristics that were less explosive, but generally Hawaiian or Strombolian in nature, occurring along the flanks of the crater and conditioned by regional and radial faults. Unlike Furnas, Sete Cidades has no active fumaroles, and most secondary manifestations occur in the submarine vents off the coast of Ponta da Ferraria and the coast of Mosteiros, as well as zones of natural degasification.