A catastrophic megathrust earthquake in the Alaska-Aleutian subduction zone represents one of the most severe natural hazard threats to the Pacific Rim.
New scientific modeling and simulated video released by the Washington State Department of Natural Resources (DNR) illustrate the terrifying, destructive path a mega-tsunami generated by a hypothetical magnitude 9.2 earthquake would take across the Pacific Ocean, directly targeting the U.S. West Coast.
Watch the computer modeling below.
The simulation demonstrates how surging ocean waves would race southward, striking coastal communities across Washington, Oregon, and California within hours. Addressing the stark reality of distant tsunami hazards, DNR geologists emphasized the necessity of advanced preparation:
“It is startling, and it is scary… trying to understand those hazards is critical for being able to plan for them. Although the chances of this happening in our lifetime is low, it’s important for families to get prepared now.”
There is chilling historical precedent for such a catastrophe.
On March 27, 1964, the Great Alaska Earthquake struck Prince William Sound. Measuring a staggering 9.2 in magnitude, it remains the most powerful earthquake ever recorded in North American history. The mega-quake triggered localized landslide tsunamis and a massive ocean-wide wave train, causing 131 deaths and over $311 million in property damage (equivalent to over $3 billion today).
Tsunami waves reached heights over 100 feet in Alaska fjords, swept away coastal communities, and killed residents as far south as Crescent City, California.
Seismologists emphasize that for the Alaska-Aleutian subduction zone, a future mega-event is not a matter of if, but when. Under a maximum magnitude 9.2 scenario, ocean modeling indicates distant tsunami waves reaching 10 to 30 feet could slam outer beaches along the West Coast, creating violent harbor currents and inundating low-lying coastal terrain.
While the recurrence interval for a massive rupture spans centuries, officials stress that understanding these wave simulations is vital to building vertical evacuation structures and saving lives before the next big one strikes.
Like the experts said, chances are low. But still, be prepared.
Related: Surfers Discover Rare and Dangerous ‘Square Waves’ in the Wilds of Alaska (Video)
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