Novarly Parcel · Seattle, WA
Is your Seattle property sinking?
Satellites have measured Seattle's ground to the millimetre: across 17,092 grid cells, the fastest-sinking spot moves 14.2 mm/yr. Check any Seattle-area address for free.
| Measured grid cells | 17,092 |
| Median ground motion | 1.9 mm/yr downward |
| Fastest-sinking cell | 14.2 mm/yr |
| Cells at notable rates (≤ −3 mm/yr) | 2% |
Satellite InSAR measurements on a ~100 m screening grid (negative = sinking). Sources: Ohenhen et al. InSAR VLM datasets (CC0/CC-BY); contains modified Copernicus Sentinel-1 data. Data updated 2026-07-23.
Screening only — not a structural guarantee. For any decision, consult a licensed geotechnical engineer.
Is Seattle sinking?
Parts of it, measurably. Across 17,092 satellite-measured grid cells in the Seattle metro, the median ground motion is 1.9 mm/yr downward, the fastest-sinking cell measures 14.2 mm/yr, and 2% of measured cells exceed the 3 mm/yr "notable" threshold. Motion varies block by block — check your specific address.
How do you measure ground motion in Seattle?
InSAR: radar satellites (Copernicus Sentinel-1) compare the phase of millions of radar returns across years of passes, revealing millimetre-scale vertical land motion. The data comes from peer-reviewed research (Ohenhen et al., Nature Cities 2025 and related datasets) and is screened on a ~100 m grid.
What should Seattle buyers and owners do with this?
Use the free screening for the measured rates around any address. An amber or red result is context for a professional conversation — share the report with a licensed geotechnical engineer or structural surveyor. A green result means no notable motion was measured nearby; it is not a guarantee.