Peak Cumulative (LOS)
-7.4 cm
Vertical Est. (41.1°)
-9.8 cm
3-Ref Sensitivity
[-7.4, -2.2] cm LOS
Rate (cm / 100 days)
-6.2 cm/100d
Annualized est.: -6.5 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -0.92 cm LOS (2026-10-04 to 2026-10-16 at p01: 35.645N 51.332E; cumulative at point: -7.39 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.69 cm 2σ): 14,681 residents (< -2 cm), 176 residents across 0.55 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | 35.6359, 51.3892 | -2.35 cm | -1.96 cm/100d |
| #2 | 35.6455, 51.3318 | -2.15 cm | -1.79 cm/100d |
Top 5 At-Risk Infrastructure Segments
Infrastructure corridor ranking (OSM canal/road overlay) has not been computed for this regional subset yet.
GNSS Comparison & Calibration Status
Continuous GNSS time-series validation was not bundled for this regional subset.
Cumulative Displacement Map
What This Means
- Peak measured ground motion in Tehran (Iran) reached -7.4 cm LOS (-6.2 cm/100d) from 2026-06-18 to 2026-10-16, but low coverage or wide reference spread makes this an indicative estimate.
- About 14,681 residents live on ground sinking faster than 2 cm per 108 days (and 176 residents across 0.55 km2 faster than 5 cm per 108 days, above the 0.69 cm 2-sigma noise floor).
- No local GNSS or canal-tilt overlay is bundled for this subset; field inspection and local piezometer records are needed to confirm infrastructure impacts.
Calibration & Quality Notice (PROVISIONAL): NISAR data are provisional. Calibration and validation are carried out by the NISAR project (NASA-JPL and ISRO), not by our team.
Sources: NASA-ISRO NISAR L2 GUNW (CRID P05023 via ASF DAAC); GHSL GHS-POP E2025 R2023A (JRC, CC BY 4.0); Nevada Geodetic Laboratory GNSS; OpenStreetMap (ODbL).
Sources: NASA-ISRO NISAR L2 GUNW (CRID P05023 via ASF DAAC); GHSL GHS-POP E2025 R2023A (JRC, CC BY 4.0); Nevada Geodetic Laboratory GNSS; OpenStreetMap (ODbL).