Earthquake
- has hypocenters and epicenters
- may be preceded by ground deformation
- measured by magnitude and intensity scales
- most frequent in alaska and volcanoes
Volcanoes
- cannot be predicted accurately
- measured by an explositivity index
- cause a visible fume or steam cloud or both
- often cause steam or gas to erupt in the atmosphere
- caused by molten rock erupting through earth’s surface
