A landslide into an Alaskan fjord displaced enough water to trigger the second largest recorded tsunami with a run up of 481 meters up the opposite shore in August 2025. This time Dr. Jeffrey Zurek sits down with University of Calgary geoscientist Dr. Dan Sugar to investigate the geophysical processes behind natural hazards, megatsunamis, glacial debuttressing, and the devastating rock-and-ice avalanche in Nepal.

Discover how advanced remote sensing tools like InSAR, NISAR, and LiDAR are revolutionizing geological hazard mapping, why climate-driven glacial retreat is destabilizing mountain slopes across high latitudes, and what it feels like for researchers tracking catastrophic geohazards in real time. We explore the non-linear pathways of scientific careers, the emotional toll of studying active disasters, and the socioeconomic determinants that dictate global hazard preparedness and community resilience.

Topics Covered

The Physics of Megatsunamis: Understanding extreme water displacement, wave run-ups, and seiches in narrow fjords

Glacial Debuttressing: How the rapid retreat of glacial ice removes critical structural support from steep mountain slopes

Remote Sensing Innovations: Leveraging InSAR, NISAR, and LiDAR data to map precursory deformation before slope failure

The Nepal Tragedy: Analyzing the compounding factors, ice volumes, and massive downstream impacts of recent Himalayan avalanches

Real-Time Disaster Science: The psychological and operational challenges researchers face when publishing on active events

Chapters

• (00:00) Intro and Tracy Arm Landslide
• (02:30) Metrics of a Megatsunami
• (03:49) Meet Dr. Dan Sugar
• (04:01) Non-Linear Science Careers
• (07:50) Desk Work Versus Field Reality
• (09:02) Inside the Alaska Fjord Wave
• (14:30) Decoding Seiches
• (20:00) Glacial Debuttressing Mechanics
• (24:00) Mapping Slope Instability
• (27:30) InSAR and NISAR Satellites
• (32:39) Analyzing the Nepal Disaster
• (38:00) Dynamic Fragmentation
• (43:30) Publishing on Active Disasters
• (50:00) Future of Geohazard Monitoring

Links & Resources

Paper: A 481-meter-high landslide-tsunami in a cruise ship–frequented Alaska fjord

Support: Pateron

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Whimsical Wavelengths: Deep-dive conversations where a working scientist unpacks how we know what we know, one paper, one idea, or whimsical detour at a time. Hosted by Dr. Jeffrey Zurek (P.Geo)

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