Today a colleague at the Netherlands Space Office showed me a new Copernicus service, the ground motion service (EGMS). Quite an amazing data service to explore. Earlier I wrote about the European forest fire information service (EFFIS), and its use as a proxy for the fighting going on due to the Russian invasion of Ukraine. EGMS is another service based on satellite remote sensing, here radar telemetry tracking the subsidence or rising of the ground. As far as I understand it can’t ‘see’ soft materials (peat land subsiding e.g.), only sees hard materials (solid ground, or buildings on softer grounds).
The images are quite amazing, and the data is provided right alongside it.

First an overview of northern Europe. Blue is rising ground, red is sinking ground. Sweden and Finland show rising ground, this is still the bounce back of the earth since the last ice age ended when the tremendous weight of glaciers was removed. At the tip of the arrow you see subsiding ground, this is the result of gas extraction in Groningen province.

Zooming in on Groningen province, here’s the data for a single house, subsiding 4 centimeters in the past 6 years. No wonder many homes are getting damaged in that area, both from subsidence as well as from the earthquakes that accompany it.

For comparison, here’s the data from the street I live on. It shows a subsidence of 6 millimeters in the past 6 years.

And here’s the same data as in the graph in the image above, but exported from the Copernicus services as an SVG, and pasted here as text.

-14-12-10-8-6-4-202468101214Displacement mm2016011120160428201608142016113020170318201707042017102020180211201805302018091520190101201904192019080520191121202003082020062420201010Measurement dateORTHO Vertical: 20dXRnBSzzDataset: Point ID: Position: Mean velocity: RMSE: ORTHO Vertical20dXRnBSzz3242050.00 N 4007550.00 E -0.60 m-1.10 mm/year0.40 mm

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