AI Insight
Satellite imagery has revealed hundreds of shallow landslides and channelized debris flows triggered by heavy rainfall (266 mm) in Rason City, North Korea, on August 31-September 1, 2026. The landslides, primarily occurring in hills west and north of the city, combined to form debris flows that damaged infrastructure, industrial facilities, and houses, while filling rivers with debris and creating a visible sediment plume in the coastal bay. Comparative satellite images from before (August 27) and after (September 3) the event document the extensive impact, though cloud cover limits full assessment pending clearer imagery acquired on September 9.
Why it matters
This event highlights the landslide vulnerability of North Korea, where information about such disasters is typically scarce. The documented damage to infrastructure and the magnitude of debris flows underscore the risks that extreme rainfall events pose to mountainous regions with limited disaster preparedness and reporting systems.
Understand the Science
Satellite images have started to reveal the hundreds of shallow landslides and channelised debris flows triggered by a major rainfall event in North Korea at the end of August 2026.
Although North Korea is landslide-prone, there is a paucity of information about the impacts and losses that occur there. Interestingly, NK Pro reported last month that a series of landslides were triggered around Rason, a city on the Russian border on 31 August to 1 September 2026.
The NK Pro report suggests that 266 mm of rainfall fell, triggering landslides and floods that damaged infrastructure, industrial plans and houses.
I have a one month lag to access Planet Labs imagery, so I’m just starting to be able to examine the aftermath of this event. This is starting to reveal what happened, but watch this space as a cloud-free image was acquired on 9 September 2026, which should be very interesting.
In the meantime, this is an Planet Labs image of the area around Rason, captured on 27 August 2026 (before the event):-
And here is the same area on 3 September 2026, albeit with some slightly irritating cloud:-
And here is a slider to compare the images:
The images show multiple shallow landslides in the hills to the west and north of Rason. These have combined to form channelised debris flows in many locations – see the cluster directly to the west of Rason, for example. The rivers are choked with debris and there is a plume of sediment extending from the river mouth into the bay.
I’ll post a more detailed analysis when better imagery is available, but these landslides around Rason look to be quite significant.
Acknowledgement
Many thanks to the wonderful people at Planet Labs for allowing me to use their imagery.
Text © 2026. The authors. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.
Source: The 31 August 2026 rainfall-triggered landslides in Rason City, North Korea