This page shows the traces of the vertical components recorded in the last 24 hours at some OSU-CT seismic stations, located (see map) in the area of the Catania historical centre. HNZ indicates the vertical component of the accelerometer and EHZ the vertical component of the velocimeter. In each screen 4 hours of recording are represented. The screens corresponding to the different time slots can be selected from the table at the top. Each line represents 15 minutes of recording and each minute is separated by vertical lines. The times are expressed in UTC. Therefore, to obtain the local time, add 1 hour during ‘solar time’ or 2 hours during ‘summer time’.