Science glossary film: Long-period events

Earthquakes with relatively low-frequency vibration, caused by sudden changes of pressure inside volcanoes and magma channels. In such events, the ground shakes at around a half to three cycles per second. Long-period events can reveal magma flow and the build-up of pressure within a volcano. This knowledge can help seismologists predict volcanic eruptions.

In such events, the ground shakes at around a half to three cycles per second. Long-period events can reveal magma flow and the build-up of pressure within a volcano. This knowledge can help seismologists predict volcanic eruptions.