We cannot predict an exact date or time for an erruption or an earthquake to occur, however we can predict there is going to be an an erruption even if we dont know when.
- Tiltmeters - detedcts movement in the ground
- temperature changes - infrared pictures to detect changes in the ground
- Sulfur rates - more likely to be an erruption when there is a high sulfur rate
- Seismographs - Measure ground movements and tremors by ink and needle
- Hydrology -measures the amount of water in rocks
- Spiders - enter places that are too dangerous for humans and take measurements.
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