An 8.8-magnitude earthquake off Russia's Kamchatka Peninsula shook the Pacific, but its tsunami fizzled. A geologist explains why.

Officials from Japan to California issued warnings after an 8.8-magnitude quake off Russia’s coast. Hours later, there were no immediate reports of major damage, although some areas remained on alert.

The earthquake that struck off the coast of Russia late Tuesday registered 8.8 on the Richter scale and ensuing tsunami has raised concerns that the Pentagon could be caught unawares by a natural disaster in a region where thousands of U.