GPS survey station, Mauna Loa, Hawaii, USA. Here, GPS is being used as a tool to monitor volcanic activity. The movement of magma beneath the surface of a volcano can change the shape of the ground. Magma moving near the surface of a volcano causes the ground above it to shift upwards. GPS is able to measure these changes, making it a useful tool to help predict eruptions.

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TOP28926747

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達志影像

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RM

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