Seismic measurements

A typical «event»

Stromboli volcano has been active for thousands of years. Normally it erupts several times per hour. In each eruption red-hot pyroclastics and clouds of ash are thrown dozens of metres into the air:

These eruptions are recorded by our seismic station. We call the corresponding seismic signal an «event»:

Sometimes these events follow each other very rapidly. In this example there were three in just one minute: