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Volcanological Mission to Study The Agung Volcano Indonesia
Let us assume that the permanent volcannic activity is a (steady) state of some regions in the earth's crust. This state is characterised by the rising of hot molten magma and/or by a greater than normal geothermal flow. The latter is accompanied by many secondary phenomena. Differences (cradionts) in pressure and in density of fluids will occur, and mechanical energy will be given off, appearing in the form of convection of gases and of thermal waters, and so on. It would be very useful to complement these direct observations of the mechanical instability by systematic observations also of those parameters which are or are believed to be "causes" of eruptions. In fact, by "causes is merely meant that changes in these parameters are likely to precede the actual mechanical instability.
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