Geomechanics.io

  • Free Tools
Sign UpLog In
AllGeotechnicalMiningInfrastructureMaterialsHazardsEnvironmentalSoftwarePolicy

Geomechanics.io

Geomechanics, Streamlined.

© 2026 Geomechanics.io. All rights reserved.

Geomechanics.io

CMRR-ioGEODB-ioHYDROGEO-ioQCDB-ioFree Tools & CalculatorsBlogLatest Industry News

Industries

MiningConstructionTunnelling

Company

Terms of UsePrivacy PolicyLinkedIn
    Projects
    Failure
    Safety

    Alaska 2025 glacier‑linked megatsunami: hazard lessons for fjord engineers

    May 12, 2026|

    Reviewed by Joe Ashwell

    Alaska 2025 glacier‑linked megatsunami: hazard lessons for fjord engineers

    First reported on Geoengineer.org – News

    30 Second Briefing

    A 10 August 2025 rockslide in Alaska’s Tracy Arm Fjord sent more than 64 million m³ of rock and debris into the water, generating a megatsunami with an estimated maximum run-up of about 481 m along the steep fjord walls, the second-highest recorded after Lituya Bay 1958. The failure was linked to support loss from South Sawyer Glacier’s retreat, with the narrow fjord geometry strongly amplifying wave heights. No casualties occurred, but the near miss for cruise traffic signals a rising landslide–tsunami hazard in deglaciating fjords that must be factored into navigation and infrastructure risk assessments.

    Technical Brief

    • Failure mechanism involved a 64 million m³ rock–debris slide from a de-buttressed, glacier-adjacent valley wall.
    • Glacier retreat of South Sawyer removed lateral support, increasing driving stresses and daylighting unfavourably oriented discontinuities.
    • Confined fjord geometry produced strong wave focusing; run-up mapping relied on stripped-vegetation limits along steep walls.
    • Monitoring implications include systematic remote sensing of deglaciating rock slopes and time-series InSAR to detect accelerating creep.
    • For hazard zoning, results support coupling glacier-retreat scenarios with 3D landslide–tsunami numerical models for design-level events.

    Our Take

    Within our 32 Hazards stories, Alaska and Greenland fjord settings recur as outliers for extreme run-up events, suggesting that glacier-retreat slopes like Tracy Arm and South Sawyer Glacier warrant more systematic remote monitoring than typical coastal hazard programmes receive in the lower 48 United States.

    The documented 64 million cubic metres landslide volume at Tracy Arm is in the same order as other recent rockslide–tsunami cases in our database, which implies that design criteria for critical infrastructure and cruise traffic in narrow fjords may need to assume near-worst-case slope failures rather than relying on historical wave records alone.

    The link to a 2018 study on glacier-melt landslide tsunamis and a 2024 rockslide megatsunami study indicates that, in our coverage, research on cryosphere-driven slope instability is moving from theoretical risk to event-backed calibration, giving practitioners in Alaska and the wider Arctic/sub-Arctic a stronger basis for probabilistic hazard zoning.

    Geotechnical Software for Modern Teams

    Centralise site data, logs, and lab results with GEODB-io, CMRR-io, and HYDROGEO-io.

    No credit card required.

    • Save and export unlimited calculations
    • Advanced data visualisation
    • Generate professional PDF reports
    • Cloud storage for all your projects

    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

    Related Articles

    Acorn adds commercial manager: implications for asbestos project delivery and safety
    Hazards
    22 days ago

    Acorn adds commercial manager: implications for asbestos project delivery and safety

    Asbestos management consultancy Acorn Analytical Services has appointed Ben James as commercial manager to lead its sales team and secure larger, more complex consultancy and removal projects. James, a former apprentice carpenter and joiner, moved into asbestos work in his early twenties after his grandfather died from asbestosis and has since progressed from trainee asbestos surveyor to contract manager over nine years. He will oversee new technical enquiries, key account management and site visits, and is qualified to deliver asbestos awareness, non-licensed removal and duty-to-manage training under a Level 3 teaching qualification.

    Coalsnaughton mine subsidence demolitions: geotechnical lessons for engineers
    Hazards
    24 days ago

    Coalsnaughton mine subsidence demolitions: geotechnical lessons for engineers

    Homes on Benbuck View and Dunmoss View in Coalsnaughton, Clackmannanshire are to be demolished after Mining Remediation Authority investigations confirmed historic underground workings had caused active mine subsidence beneath the two streets. The decision follows visible ground movement reported on 18 May and subsequent detailed geotechnical assessments that ruled out practical stabilisation options for the affected plots. Engineers will now need to manage demolition, backfilling and long-term ground monitoring, with implications for foundations and service corridors on adjacent properties built over former coal measures.

    LondonEnergy Wembley Waste Transfer Station fire: structural and fire design lessons
    Hazards
    28 days ago

    LondonEnergy Wembley Waste Transfer Station fire: structural and fire design lessons

    A major fire at LondonEnergy’s Wembley Waste Transfer Station on Hannah Close, Neasden, has required 20 fire engines and about 125 firefighters to bring the blaze under control. The incident at the enclosed waste-handling facility raises immediate concerns over structural integrity of steel frames, cladding performance under high thermal loads, and potential damage to concrete slabs from prolonged heating and quenching. Engineers will need rapid assessment of fire spread pathways through waste stockpiles and building services to inform repairs, resilience upgrades and future fire-separation design.

    Related Industries & Products

    Mining

    Geotechnical software solutions for mining operations including CMRR analysis, hydrogeological testing, and data management.

    Construction

    Quality control software for construction companies with material testing, batch tracking, and compliance management.

    CMRR-io

    Streamline coal mine roof stability assessments with our cloud-based CMRR software featuring automated calculations, multi-scenario analysis, and collaborative workflows.

    HYDROGEO-io

    Comprehensive hydrogeological testing platform for managing, analysing, and reporting on packer tests, lugeon values, and hydraulic conductivity assessments.

    GEODB-io

    Centralised geotechnical data management solution for storing, accessing, and analysing all your site investigation and material testing data.