Why did such a powerful earthquake produce such a weak tsunami?

Early Wednesday (Tuesday afternoon in Hawaii), a powerful earthquake, one of the largest ever recorded, struck off the coast of the Kamchatka Peninsula in Russia. Tsunami warning centers along the Pacific coastline quickly sprang into action, issuing advisories for the potential of colossal ocean waves that are often generated by big earthquakes.

See the original article at: Honolulu Star-Advertiser