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" ... The earliest satellites in the 1950s and 1960s taught us by how much the Earth was flattened due to its rotation; today we have permanent geodetic networks and accurate measurements of not only Earth’s gravitational field at every point, but how that gravitational field changes on timescales as short as a few days. When droughts, floods or wildfires occur, the changes in the gravitational field due to mass loss or increase can actually be measured. ... "
" ... The fault's rate of slip deficit buildup can also be measured through the use of geodetic observations that track how the earth's surface moves over time, for example by using highly precise GPS sensors installed on land, together with a model that relates how slip on the fault affects the movement of these stations. However, it is hard for scientists to use this technique to "see" what is going on in the shallowest part of the fault, because it is far from land, below miles of water, where traditional GPS instruments cannot operate. ... "