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Greenland Megatsunami Explained: The 9-Day Seismic Mystery | CIRAS File

In 2023, a massive landslide in Greenland triggered a megatsunami that caused Earth to pulse every 90 seconds for nine days. Scientists traced the signal to a rare standing wave—but CIRAS notes irregular persistence and structural resonance.

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> CLASSIFICATION: [WATCH]
> CATEGORY: SEISMIC ANOMALY / MEGATSUNAMI EVENT
> SOURCE: Popular Mechanics — Greenland Megatsunami Analysis
> DATE LOGGED: APR 2026

> EVENT:

In September 2023, a large-scale landslide occurred within a remote fjord system in Greenland, displacing massive volumes of rock and ice into the water below.

The impact generated a megatsunami within the confined fjord, producing an initial wave of extreme height and energy.

Following the event, global seismic monitoring stations detected a persistent signal repeating approximately every 90 seconds over a period of nine days. :contentReference[oaicite:0]{index=0}

The signal disappeared, then reappeared weeks later under similar conditions.

Scientific analysis attributes the phenomenon to a rare standing wave (seiche) trapped within the fjord, oscillating back and forth due to its confined geometry. :contentReference[oaicite:1]{index=1}

Satellite data later confirmed subtle changes in water height consistent with long-duration oscillation patterns.

However, CIRAS review identifies several irregularities:

- Signal persistence significantly exceeds typical post-impact decay cycles - Reappearance of identical frequency pattern after initial dissipation - Global seismic detectability despite localized origin

Additional observations indicate the initial wave may have reached extreme heights before stabilizing within the fjord system. :contentReference[oaicite:2]{index=2}

Internal modeling suggests: - Fjord geometry may amplify and sustain oscillation beyond predicted limits - Energy retention within enclosed systems may be underestimated - External factors influencing signal stability cannot be fully excluded

> NOTES:
The seismic signal was detected globally and did not match standard earthquake signatures.
Event required elimination of multiple alternative explanations before confirmation.

> STATUS: Monitoring ongoing.
> ACCESS LEVEL: GREEN / OBSERVER

Greenland Megatsunami Explained: The 9-Day Seismic Mystery | CIRAS File

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