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No, I mean the movement of earth underneath the house, tectonic plates etc. Earthquakes are one obvious example:

https://gis.stackexchange.com/questions/7182/does-an-earthqu...

To be fair, the cited displacement of 8 ft (average for non-earthquake situations is 0 to 10cm) is within the typical margin of error of a GPS. That is, the coordinate change is small enough not to matter for “election” purposes.

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