What are the most important methods and instruments used to predict volcanic eruptions?

The most important methods are:

-Gravimeters .

-Seismograph .

-Electricity meters.

-Tiltmeter.

And the most important method to predict volcanic eruption is calculate the volume and flow of magma.

Explanation:

-Gravimeters capture the gravitational field to detect fluid magma.

-Seismographs are used to calculate the intensity of earthquakes caused by moving magma.

-Magma generates electric currents, for that electricity meters, are used to control the magnetic and magma increase.

-The tiltmeter is a sensor that uses a laser beam to find out if the magma level has dropped or increased and the difference between new and old data is calculated.

Three researchers had the idea of creating a method where the volume and flow of magma are calculated and together with the instruments for calculating eruptions, magma explosions can be predicted in a specific period.