******************************************* Nevado del Ruiz, Colombia seismic activity ******************************************* Nevado del Ruiz-Strong seismic activity Nevado del Ruiz Volcano (Colombia, South America) started a new cycle of strong seismic activity. On June 9, 2002, at 23 hours (local time) a swarm of volcano-tectonic earthquakes was recorded by the seismic network. Following that swarm houndreds of hybrid earthquakes were recorded. More than 1300 earthquakes occurred in 16 hours. This seismicity continued for three days. About 2300 earthquakes were detected. This is the highest number of events per day recorded at Nevado del Ruiz volcano since 1985. Seismic energy release reached high values too....