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USGS CMG InfoBank: Volcanic Eruption Precursors

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Comment: 14:57 - 15:26 (00:29)
Source: Annenberg/CPB Resources - Earth Revealed - 1. Down to Earth
Keywords: "Robert Tilling", "volcanic eruption", "ground deformation"

Our transcription: Probably all volcanic eruptions are preceded by and accompanied by measurable changes in the physical or chemical state of the volcano, and one of the principal means of monitoring or measuring the changes, at least the physical configuration of the volcano is by means of what we call "ground deformation studies."
This simply is just a term for measuring the changes in the shape of the volcano.

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