GPS stations record their position by communicating with satellites once a day

GPS stations record their position by communicating with satellites once a day. By repeatedly measuring distances between specific points geologists can determine the movement along faults or between plates.These get process in time series plots that have a rate of movement of North, East, Vertical. There are approximately 2570 gps stations

A strainmeter is an instrument that is used by geophysicists to measure the deformation in the earth. Linear strainmeters measure changes in distance of 2 set locations. This is done using either a solid piece of material (used for short distances) or a laser interferometer (used over a long distance). Solid material strainmeters measure changes over very small distances and are normally placed in boreholes. Strainmeters can measure deformation over frequencies from a few hz over days, months or years

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