Tsunami warnings are active for Northern California, Russia’s Kamchatka Peninsula, Japan, and parts of Alaska due to an 8.8-magnitude earthquake off Kamchatka. Advisories are in place for the rest of California, Oregon, Washington, Hawaii, Pacific Islands, Marianas, and parts of Alaska, with risks of strong currents and localized flooding. Australia faces no threat. Video (illustrative): In deep ocean water, tsunamis can travel at speeds exceeding 800 km/h (500m/h), comparable to a jet plane. As