January 2025 Eaton Fire — Altadena/Pasadena, CA

14,021 acres • 9,418 structures destroyed • Santa Ana wind event • Mode 1 Damage Assessment

⚠ Uncalibrated — DR multipliers pre-DINS calibration. Loss estimates are indicative only.

Estimated Loss

$2.6B

Ground-up structural loss (Mode 1, Z1–Z3)

$188.9B total RCV in bbox

Color Mode

Zone Legend

Z1Core (interior)

Z2Transition (0–150m)

Z3Ember cast (downwind)

Zone Summary

Zone	Structs	Est. Loss
Z1	8,671	$2,053M
Z2	4,149	$408M
Z3	4,801	$151M

Layers

Fire perimeter LANDFIRE fuel model

Perimeter: NIFC WFIGS (final, 14,021 ac)
Structures: Overture Maps + Hummingbird SI (CA)
Zones: geometric distance from perimeter
Wind dir: NE (Santa Ana, ~50°)

Mode 1 — Damage Assessment Methodology

Zone Architecture

Structures are assigned to zones Z1–Z5 based on their geometric relationship to the final fire perimeter:

Z1 (Core): Interior of burned perimeter. DR 0.70–0.90. Primary loss zone.
Z2 (Transition): 0–150m outside perimeter. DR 0.20–0.40. Residual/spotting.
Z3 (Ember cast): 150–500m, downwind sector ±60°. DR 0.05–0.15.
Z4 (Fringe): 500m–1.5km. DR 0.01–0.05. High-value structures only.

BDI (Lee Building Damage Index)

BDI = H × V × E, where H is the zone hazard weight, V is vulnerability (roof material, occupancy type), and E is normalized RCV exposure. Loss = DR(BDI) × RCV.

Calibration Status

DR multipliers are pre-calibration defaults. DINS (CAL FIRE structure damage surveys) calibration against the Eaton Fire will adjust zone-specific DR values. Estimates shown are indicative only.

Perimeter Source

Final containment perimeter from NIFC WFIGS (23,448 acres, contained Jan 31 2025).