Abstract
Following an increase of eruptive activity at Stromboli summit craters in February 2004, we promptly carried out SEM-EDS microanalyses and textural observations on samples of lapilli to check the possible occurrence of Low Porphyritic magma (LP magma), a forerunner of hazardous paroxysmal eruptions. The acquired results suggest that all erupted glasses belong to the High Porphyritic magma (HP magma), which characterizes the typical mild explosive activity of the volcano.
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