Under revision (phase_cycle_jump): Automated time-series QC flagged this headline series for independent review — step 1 (2026-06-20→2026-07-02) = -13.03 cm ≈ one phase cycle (12.1 cm).
Peak Cumulative (LOS)
-22.2 cm
Vertical Est. (45.7°)
-31.9 cm
3-Ref Sensitivity
[-22.2, -12.4] cm LOS
Rate (cm / 100 days)
-18.5 cm/100d
Annualized est.: -67.7 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -4.45 cm LOS (2026-10-06 to 2026-10-18 at p01: -6.870N 109.481E; cumulative at point: -22.23 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.78 cm 2σ): 1,142,831 residents (< -2 cm), 817,267 residents across 551.99 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | -6.8700, 109.4814 | -22.23 cm | -18.52 cm/100d |
| #2 | -6.8230, 109.5003 | -20.93 cm | -17.45 cm/100d |
| #3 | -6.9733, 109.4434 | -20.30 cm | -16.92 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 Pekalongan (Indonesia) reached -22.2 cm LOS (-18.5 cm/100d) from 2026-06-20 to 2026-10-18, but low coverage or wide reference spread makes this an indicative estimate.
- About 1,142,831 residents live on ground sinking faster than 2 cm per 108 days (and 817,267 residents across 551.99 km2 faster than 5 cm per 108 days, above the 0.78 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).