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John Dehls @john.dehls.net · 17/04/2026

I’d especially like to highlight Session 2.2. This session steps back a bit and looks at the bigger picture: Do we need continental or even global #InSAR - based ground motion services to support disaster risk reduction? (Answer is YES).

Image showing the names and faces of the convenors of Session 2.2, Toward continental and global InSAR ground motion services for landslide risk reduction.

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John Dehls @john.dehls.net · 17/04/2026

Session 2.1 focuses on advances in landslide detection and monitoring using Earth Observation. There’s room here for a wide range of approaches—InSAR, optical, data fusion, ML, early warning, etc. If you’re working on methods or applications, this is a good fit.

Image showing the names and faces of the convenors of Session 2.1, Advances in EO-based landslide detection and monitoring.

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John Dehls @john.dehls.net · 17/04/2026

Just under two weeks left to submit abstracts to the 7th World Landslide Forum (WLF7), to be held in India in November 2026. I’d like to draw attention to a couple of #InSAR #DRR sessions that may be of interest: wlf7.org/themes-sessi...

Poster showing that the 7th World Landslide Forum abstract submission deadline has been extended to April 30, 2026.

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John Dehls @john.dehls.net · 02/03/2026

This is a big one, literally. New paper out in Geomorphology: we use multi-geometry Sentinel-1 InSAR to unravel the internal kinematic segmentation of a 55 km² deep-seated landslide in the NW Himalaya. www.sciencedirect.com/science/arti... #DRR #InSAR #Sentinel-1 #landslide

Fig. 9. Conceptual and geological framework relevant to slope deformation at the Leo Pargil Dome. (a) Conceptual scheme illustrating gravity-driven zones of extension and compression on a steep ridge, after Savage and Varnes (1987). (b) Simplified geological cross-section and block diagram of the Leo Pargil Dome, showing the regional structural architecture and extensional setting, after Thiede et al. (2006). (c) Northwest-oriented geological cross-section across the western flank of the Leo Pargil Dome at the latitude of Nako village, highlighting major lithological units and extensional structures, after Langille et al. (2012).

Fig. 6. Decomposition of LOS velocities into 2D displacement rates using an extended colour scale. (a) East–west horizontal and (b) vertical velocity fields inverted from paired Sentinel-1 ascending and descending LOS velocity fields (2018–2023).

Fig. 5. Decomposition of LOS velocities into 2D displacement rates using a narrow colour scale. (a) East–west horizontal and (b) vertical velocity fields inverted from paired Sentinel-1 ascending and descending LOS velocity fields (2018–2023).

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John Dehls @john.dehls.net · 04/01/2026

Hey #inuitart experts. I purchased this qiviut wall hanging in Yellowknife in 1993. It used to have a tag on it with the name of the artist, as well as the community she came from, but it is lost. I would very much like to know more about the artist. Does anyone recognise the signature or the style?

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John Dehls @john.dehls.net · 04/11/2025

⏰ Deadline extended! The #ISPRS2026 abstract submission deadline is now 17 November. Check out our Special Session on Cooperation on Ground Motion Monitoring for DRR & Resilience 👇 www.isprs2026toronto.com/special-sess... #InSAR #DisasterRiskReduction #ISPRS2026

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John Dehls @john.dehls.net · 22/09/2025

Groundwater & infrastructure: Subsidence in California or Spain’s Guadalentín Valley shows how over-extraction damages farmland, cities, and flood defences. InSAR makes the invisible visible.

European Ground Motion Service map of the Guadalentín Valley, Spain. InSAR deformation points show a gradient from green (stable) to red (strong subsidence), revealing land sinking caused by intensive groundwater extraction in agricultural areas.

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John Dehls @john.dehls.net · 22/09/2025

Mining & tailings dams: InSAR highlights deformation at sites like Uzbekistan. Failures can release toxins, devastate ecosystems, and take lives. Many risks are preventable if we act early.

Satellite image of a large tailings dam in Uzbekistan. InSAR deformation data shows a red band around the dam walls, indicating significant ground movement.

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John Dehls @john.dehls.net · 22/09/2025

Glacial Lake Outburst Floods (GLOFs): InSAR detected precursory deformation at South Lhonak Lake before its catastrophic 2023 flood. These events cascade far downstream. (www.science.org/doi/10.1126/...)

Satellite view of South Lhonak Lake in the Himalayas, overlaid with InSAR deformation data. Red and orange zones along the moraine show precursory ground movement before the catastrophic 2023 glacial lake outburst flood.

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John Dehls @john.dehls.net · 22/09/2025

Here are three examples from San Juan Province, Argentina, highlighted by #InSAR. These slow-moving landslides affect large, high-relief mountain slopes and demonstrate the value of regional-scale monitoring for identifying potential geohazards in remote areas where on-the-ground access is limited.

Satellite images of steep mountain slopes in Argentina. Top row shows natural-colour terrain. Bottom row overlays InSAR ground deformation data, with red areas marking active slope movement, highlighting large, slow-moving landslides across the region.

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John Dehls @john.dehls.net · 22/09/2025

#InSAR is a proven technology for disaster risk reduction—and it scales. Examples like InSAR Norway insar.ngu.no and the European Ground Motion Service already provide billions of open measurements.

Image from InSAR Norway showing a fjord with mountainsides. The mountainsides are coloured red where unstable slopes are moving.

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John Dehls @john.dehls.net · 22/09/2025

Why are we organizing this? To push forward a new initiative: making life-saving ground motion data available worldwide, especially where it’s needed most.

Partial globe showing coverage by the European Ground Motion Service, showing dense deformation measurements. Highlights how some regions have access to life-saving data, while most of the world does not.

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John Dehls @john.dehls.net · 30/07/2025

I guess I will be holding my breath until about 14:29 CET today. #NISAR #InSAR

NISAR launch schedule, Launch at 14:10 CET, separation at 14:28.

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John Dehls @john.dehls.net · 15/02/2025

I hope not! Let's stick to the Sun-synchronous, near-polar orbit plan 😅

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