Despite previous assurances^ about the rock-solid stability of the earth’s dimensions, further analysis of satellite altitude data suggests that there may still be a bit of life in the old girl (Mother Earth) yet.*
The following abstract suggests that some minimal expansion activity can still be discerned today insofar as some of the observed satellite altitude variation that is usually explained as sea level rise is actually the result of earth expansion.
Evidences of the expanding Earth from space-geodetic data over solid land and sea level rise in recent two decades
Wenbin Shena, Ziyu Shena, Rong Sunc, Yuri Barkind
30 June 2015
According to the space-geodetic data … vertical variation of the Earth’s solid surface suggests that the Earth’s solid part is expanding at a rate of 0.24 ± 0.05 mm/a in recent two decades.
In another aspect, the satellite altimetry … demonstrate the sea level rise (SLR) rate 3.2 ± 0.4 mm/a, of which 1.8 ± 0.5 mm/a is contributed by the ice melting over land. This study shows that the oceanic thermal expansion is 1.0 ± 0.1 mm/a due to the temperature increase in recent half century, which coincides with the estimate provided by previous authors. The SLR observation by altimetry is not balanced by the ice melting and thermal expansion, …, in this study we infer that the oceanic part of the Earth is expanding at a rate about 0.4 mm/a.
Combining the expansion rates of land part and oceanic part, we conclude that the Earth is expanding at a rate of 0.35 ± 0.47 mm/a in recent two decades. If the Earth expands at this rate, then the altimetry-observed SLR can be well explained. …
^ From the linked report, … The scientists estimated the average change in Earth’s radius to be 0.004 inches (0.1 millimeters) per year, or about the thickness of a human hair, a rate considered statistically insignificant. …
* By way of explanation, my current view is that most of the expansion occurred in the past when mantle conditions were radically different to present day norms, …and that the activity was both rapid and episodic.