What tool do scientists use to predict earthquakes?

Five instruments that may be used in an attempt to predict an earthquake are the following:

1. Creepmeter, which straddles the fault line and shows when the soil above the earth's crust starts to move as part of an earthquake;

2. Global positioning system, which shows when the earth's crust starts to shift as part of an earthquake;

3. Laser light, which straddles the fault line and shows when a light beam from one side isn't transmitted in the expected amount of time or to the expected place on the other;

4. Magnetometer, which shows the changes that are made to the magnetic field by the underground activities leading to an earthquake;

5. Strain meters, through the coordinated use of the seismograph and seismometer, to show the presence of the vibrations that lead up to and are part of an earthquake.