Volcanos

Roundup of Global Volcanic Activity:

San Miguel (Chaparrastique) volcano (El Salvador): increasing volcanic unrest, small explosions. A small ash explosion occurred yesterday afternoon at the volcano, at 16:44 (local time). It only lasted about 10 minutes and produced a small ash plume rising approx. 500 m. It is the first eruptive activity since the larger explosion on 29 Dec past year, and is likely only a precursor of more violent activity to come. Seismic activity has been increasing constantly over the past weeks, and clusters of earthquakes have been taking place at shallow (1 km) depth beneath the northern flank, MARN scientists measured. Tremor, indication of internal fluid (magma) movements and/or pressure, has been rising in intensity. As well, increasing values of sulphur dioxide (SO2) degassing suggest that new magma is rising within the volcanic edifice.