Marseille Area Fire 2025 — Burn Severity Map & Satellite Analysis
Tue Jul 08 2025 00:00:00 GMT+0000 (Coordinated Universal Time)
About this fire
On the morning of 8 July 2025, a violent wildfire erupted in Pennes-Mirabeau and spread rapidly toward France’s second-largest city, Marseille. In just hours, the fire consumed 750 hectares of pine forest and garrigue on the northern outskirts of the Marseille metropolitan area. France’s Interior Minister Bruno Retailleau traveled to the site that evening as the situation remained under high surveillance.
The fire’s proximity to a major urban center caused immediate and severe disruption. Marseille-Provence Airport — France’s 5th-busiest — was shut down at midday, with 70 flights cancelled and aircraft diverted to Nice, Montpellier, and Lyon. The A55 and A50 motorways were partially closed, and TGV and TER train service to Marseille’s Saint-Charles station was suspended except for the Toulon direction. Within the city, northern neighborhoods including Saint-Antoine, l’Estaque, Saint-Henri, and Septèmes-les-Vallons were evacuated as smoke engulfed the city and air quality deteriorated sharply.
Over 720 firefighters and marines-pompiers were mobilized, with reinforcements from neighboring departments. Nine firefighters were injured and more than a dozen homes were damaged. The event demonstrated how a wildfire on the wildland-urban interface can paralyze a major European city within hours.
Timeline & severity
| Date | Event |
|---|---|
| 8 Jul 2025 (morning) | Fire ignites in Pennes-Mirabeau, spreading toward Marseille |
| 8 Jul 2025 (midday) | Marseille-Provence Airport closed; 70 flights cancelled |
| 8 Jul 2025 (afternoon) | 750 ha burned; A55/A50 motorways shut; northern Marseille evacuated |
| 8–9 Jul 2025 | 720 firefighters deployed; fire brought under control overnight |
| Post-fire | 750 ha burned; 9 firefighters injured; 12+ homes damaged |
The fire’s spread rate — 750 hectares in a single morning — was driven by strong Mistral winds, temperatures above 35°C, and decades of fuel accumulation in the pine forests north of Marseille. The urban-wildland interface made evacuation and infrastructure protection extraordinarily complex.
Satellite analysis
Sentinel-2 satellite imagery captures the fire’s impact on the Pennes-Mirabeau wildland-urban interface.
Burn severity (dNBR)
| Metric | Value | Image date |
|---|---|---|
| Pre-fire NBR | 0.018 | 29 Jun 2025 |
| Post-fire NBR | 0.021 | 8 Aug 2025 |
| dNBR | −0.003 | — |
| USGS severity class | Unburned (area average) | — |
The extremely low NBR values (0.018–0.021) reflect the urban character of this zone — the bounding box includes dense built-up areas, roads, and infrastructure where NBR is near zero. The fire burned through fragmented garrigue patches interspersed with development, so the area-average signal is diluted. Pixel-level analysis of the burned garrigue patches would show meaningful NBR decline, but the mixed land cover masks this at the aggregate level.
Vegetation timeline
| Period | NDVI | NBR | NDMI | Context |
|---|---|---|---|---|
| Jan 2024 | 0.152 | 0.036 | 0.002 | Winter — very low vegetation |
| Jul 2024 | 0.148 | 0.020 | −0.025 | Summer — negative NDMI (drought) |
| Jan 2025 | 0.154 | 0.035 | 0.005 | Pre-fire winter |
| Jun 2025 | — | 0.018 | — | Pre-fire image |
| 8 Jul 2025 | — | — | — | Fire ignites |
| Aug 2025 | — | 0.021 | — | Post-fire image — no area-average change |
| Jul 2026 | 0.113 | 0.020 | −0.017 | 1 year post-fire — NDVI declined |
Key findings
The NDVI decline from 0.148 (Jul 2024) to 0.113 (Jul 2026) suggests net vegetation loss in the zone, likely from both fire damage and ongoing urban pressure. The persistently negative NDMI (−0.017) indicates that the remaining vegetation is under severe moisture stress. The fire’s impact on the urban-wildland interface is better assessed through high-resolution pixel analysis than area averages, as the mixed land cover dilutes the NBR signal.
Read our full guide: What is NBR? →
Recovery outlook
The pine forests between Pennes-Mirabeau and Marseille have burned repeatedly in recent decades, and the 2025 fire will accelerate the shift toward more fire-resistant garrigue and shrubland in the most severely burned zones. Reforestation with mixed-species stands — rather than the fire-prone Aleppo pine monoculture — will be essential to reduce future risk. Satellite monitoring of NDVI and NBR regrowth trajectories over the next 2–3 years will help land managers identify where natural regeneration is succeeding and where active replanting is needed. The fire also reignited debate about fuel management zones between the forest and Marseille’s northern suburbs.
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