The probability of a volcanic eruption is predicted by simultaneously receiving long-wave radiation signals from magma at at least four points in the vicinity of the magma, cross-correlating the received signals to detect time lags among the signals, calculating the site, magnitude and shape of the magma...http://www.google.fr/patents/US4961143?utm_source=gb-gplus-shareBrevet US4961143 - Method of predicting volcanic eruptions
