The statement 'The 1964 Great Alaska Earthquake was the second most powerful earthquake ever recorded on planet Earth' is true.

• A. True
• B. False
• C. Not Enough Data
• D. It Is The Most Powerful

Answer: (A)

When we compare earthquakes by how much energy they released, scientists use a magnitude that reflects the total slip along the fault—the moment magnitude. The 1964 Great Alaska Earthquake reached about a 9.2, placing it among the largest quakes ever recorded. The largest on record is the 1960 Valdivia quake in Chile, around 9.5, which is why the Alaska event is considered second. Keep in mind that rankings can shift slightly with new data or different magnitude estimates for other events, but the standard reference most often cited places the Great Alaska Earthquake as second. Understanding this helps explain why the Alaska event is highlighted as one of the planet’s most powerful earthquakes, a result of its subduction-zone setting and the enormous energy released, which also spawned Pacific-wide tsunamis and lasting effects on coastal communities, including Alaska Native villages that experienced landscape changes and impacts from the waves and shaking.