Pasuruan fire, August 2023 Pasuruan, Kota Batu, Malang
The fire started on 27 August 2023 in Pasuruan, Indonesia, and satellites saw it burning for 11 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 4,303 hectares from heat detections, spread across 3 municipalities.
It is the 12th largest in East Java since 2016 (of 38 with a page). Number 17 in Indonesia in 2023, of 168.
We have the GWIS perimeter for this fire, but the VIIRS sensors did not capture it in enough detail: no day-by-day evolution, but the split by municipality is there.
- Burnt area
- 4,303ha
- GWIS perimeter (Copernicus)
- Duration
- 11days
- 27 Aug 2023 – 6 Sept 2023
- Municipalities hit
- 3
- regencies
- Started on
- 27 Aug
- 2023
- Danger at start
- 8
- Low · FWI index
Where it burned
The weather it burned in
It had gone 23 days without rain (1 mm or more) when it started. Rain came after the fire: 1.3 mm on 7 Sept.
This area had burned before
83% of the perimeter overlaps earlier fires recorded since 2016: 123 ha in 2017, 1,893 ha in 2018, 3,289 ha in 2019. Part of it burned more than once, so the yearly figures add up to more than the 3,572 ha that had burned before.
What happened to each town
-
Pasuruan where it started2,958 ha2.0 %
-
695 ha3.5 %
-
677 ha0.2 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance is from the town centre to the nearest fire: staying a kilometre away does not mean it reached the houses.
The weather day by day
ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.
Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 27 Aug | 17.9 °C | 45 % | 20 km/h | 0.9 mm | Low 8 |
| 28 Aug | 18.2 °C | 45 % | 27 km/h | 0.9 mm | Low 7 |
| 29 Aug | 19.1 °C | 40 % | 30 km/h | 0.0 mm | Low 11 |
| 30 Aug | 18.4 °C | 42 % | 30 km/h | 0.0 mm | Moderate 13 |
| 31 Aug | 18.6 °C | 45 % | 22 km/h | 0.0 mm | Moderate 12 |
| 1 Sept | 18.9 °C | 41 % | 22 km/h | 0.0 mm | Moderate 13 |
| 2 Sept | 18.3 °C | 44 % | 24 km/h | 0.0 mm | Moderate 13 |
| 3 Sept | 18.2 °C | 40 % | 21 km/h | 0.0 mm | Moderate 13 |
| 4 Sept | 18.6 °C | 34 % | 27 km/h | 0.0 mm | Moderate 15 |
| 5 Sept | 19.4 °C | 39 % | 32 km/h | 0.0 mm | Moderate 16 |
| 6 Sept | 18.8 °C | 48 % | 22 km/h | 0.8 mm | Low 10 |
| 7 Sept after | 17.9 °C | 50 % | 23 km/h | 1.3 mm | Low 6 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 7 September 2023 the air beside the fire reached 45 µg/m³ of PM2.5. That day averaged 31: 2.1 times the WHO daily guideline (15).
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Other fires nearby
Frequently asked questions
- How long did the Pasuruan fire last?
- GWIS (Copernicus) dates it between 27 August 2023 and 6 September 2023: 11 days between the first and last heat detection of the perimeter.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 4,303 hectares (43.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Pasuruan (2,958 ha, 2.0 %); Kota Batu (695 ha, 3.5 %); Malang (677 ha, 0.2 %).
- What was the weather like?
- During the fire the temperature reached 19.4 °C, humidity dropped to 34 % and gusts hit 32 km/h. The fire danger index (FWI) reached 16, class Moderate.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Indonesia (geoBoundaries). It is not an official report.
Where to verify it
A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.
Emergency number: 112
Satellite cross-check
Does something look wrong on this page?
This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.
Report an error
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.