Millennium Tower Sinking?

milltowersink

The sinking of the Millennium Tower has already sunk over 400 mm / 16 inches. As you would expect this is causing quite a lot of problems, summed up nicely by the NY Times.

The Sentinel data is rather amazing in showing how isolated the worst of the phenomenon seems to be.

From ESA:

Data from the Sentinel-1 satellites acquired between 22 February 2015 and 20 September 2016 show that Millennium Tower in San Francisco is sinking by about 40 mm a year in the ‘line of sight’ – the direction that the satellite is ‘looking’ at the building. This translates into a vertical subsidence of almost 50 mm (almost two inches) a year, assuming no tilting. The coloured dots represent targets observed by the radar. The colour scale ranges from 40 mm a year away from radar (red) to 40 mm a year towards radar (blue). Green represents stable targets.

Here’s the full article from ESA.

Copyright:   Contains modified Copernicus Sentinel data (2015–16) / ESA SEOM INSARAP study / PPO.labs / Norut / NGU

Leave a Reply