Campi Flegrei volcano (Italy): micro-seismic activity picks up
Another weak seismic swarm is in progress under Europe's most active caldera. Since yesterday, 12 weak earthquakes have occurred at shallow depths of mostly around 2 km under the ground since yesterday. None of these quakes was strong enough to be felt, but the very sensitive monitoring network of the Vesuvius volcano observatory of INGV (also responsible to monitor the Phlegrean Fields, and Ischia volcanoes) has detected an increase of micro-seismic activity already since October this year. In total, there have been 212 weak tremors in the area of the caldera. 126 quakes of these occurred between Pozzuoli, the Solfatara-Pisciarelli area and the Gulf of Pozzuoli. Other parameters of volcanic unrest also remain above normal levels: Ground inflation is continuing slowly, but has totaled 87 cm uplift since 2005 in the most affected area near the Rione Terra GPS station. Gas emissions also continue to increase again, after having been on a decreasing trend in the previous mon...