Second, Mallorca appears to be particularly well suited to the task, because neither tectonics nor isostasy - geological forces of crustal motion
- over-complicate the record.
Blewitt and his colleagues monitor crustal motion
using a receiver that picks up signals from the Global Positioning System (GPS), a constellation of 24 satellites orbiting Earth.
Mantle that sinks at the plate boundary flows back up farther away, pushing on the crust and causing uplift and crustal motions
detectable by global positioning system, the authors found.
The power from those nuclear decays--which exceeds that of 10,000 nuclear power plants--propels many dynamic features of the planet, including crustal motions
that give rise to earthquakes and volcanoes and the convection of softened rock within the planet's mantle.