RiskEvents
ClosedMedium impactAI Generated

Alaska Mega-Tsunami (481m Runup) – Tracy Arm Fjord Landslide – 10 Aug 2025

Occurred 10 Aug 2025·Detected 10 May 2026·
🇺🇸 Tracy Arm fjord, near South Sawyer Glacier, approximately 80 miles south-southeast of Juneau, Alaska, USA1 reportEnded 29 May 2026
Natural CatastrophePropertyMarine HullMarine CargoCasualty & Liability

On 10 August 2025, a landslide of over 64 million cubic metres of rock collapsed into Tracy Arm fjord near South Sawyer Glacier, Alaska, approximately 80 miles south-southeast of Juneau. The collapse generated a megatsunami with a runup of 481 metres — one of the tallest ever recorded — and an initial breaking wave of 100 metres travelling at over 70 metres per second. No fatalities or injuries occurred, attributed to the 5:26 a.m. local timing when no cruise ships or large visitor groups were present. A study published in Science in May 2026 links the event to glacial retreat driven by climate change and warns of heightened future risk to cruise vessels in glacier fjords.

AI-generated from linked source reports. See our correction policy.

Impact verdict

Medium impact. Although no casualties or confirmed insured losses occurred in this instance, the event represents a severe near-miss for the cruise industry in a heavily trafficked tourist area. The scientific study raises systemic risk concerns for marine hull and casualty underwriters covering cruise and tour vessels operating in Alaska glacier fjords, with implications for future policy terms and exclusions.

View assessment methodology

Premium discovery tier

Unlock analyst briefs, intelligence depth, and the revision timeline

Public pages show event facts and a short lead-in. Premium accounts unlock analyst briefs, deeper intelligence, loss context, and the full revision history for this event.

Start two-week trial

Geographic Zone Matches

2 active matches

  • TRIA Certified Areas
    Rule-basedConfidence 100%
  • Pacific Ring of Fire
    Rule-basedConfidence 100%

Geographic zone matches are RiskEvents spatial/analytical indicators, not coverage determinations or Lloyd's official classifications.

Affected countries

🇺🇸 United States

Lloyd's classifications

Tracking this kind of risk? Get an email when Natural Catastrophe events escalate.

Get alerts
← Back to live events