MAGMA BUDGETS AND STEADY-STATE ACTIVITY OF VULCANO AND STROMBOLI

We present three models for magma budget during steady-state volcanic activity, by which non-erupted magma is emplaced as dykes or cumulates or crystallises in place. Using gas and thermal data we apply our mod els at Vulcano to calculate degassing, cooling and crystallisation of magma at a rate of 40-375 kg s(-1) within a magma body with an upper s urface at a similar to 2 km depth. At Stromboli we calculate a steady magma supply of 300-1300 kg s(-1) to shallow (<1 km) depths.