What Do Seismograms Show?

Generally speaking, seismograms can be said to depict seismic noise naturally occurring in the vicinity of the monitoring stations. Particularly quiet locations are characterised by thin wavy signals with minor deviations (e.g. station SGT04). This regular wavy signal is caused by storm systems in the Atlantic and described as marine microseismics. In the summer its amplitude is greater than in winter and it gives several days' advance warning of the arrival of low-pressure fronts.