What Lies Beneath

Last week's earthquake was large enough to create a tsunami, but it didn't. That may have been a matter of pure luck

Q: Why didn't last week's earthquake cause a massive tsunami?
A: The earthquake ruptured some 30 km below the ocean floor, significantly deeper than the Dec. 26 quake, which was only 10 km deep and in shallower waters. All that earth muffled the force of last week's quake and kept the seafloor from rising suddenly, which could have triggered a major tsunami. "There just wasn't a big enough bulge in the water to...