One of the strongest earthquakes ever recorded struck Russia’s Far East early Wednesday, causing tsunami waves to wash ashore in Japan and Alaska and calls for people around the Pacific to be on alert or move to higher ground. The 8.8 magnitude temblor set off warnings in Hawaii, North and Central America and Pacific islands south toward New Zealand, with officials warning that the potential tsunami danger may last for more than a day. Here's a glance at some of the most powerful earthquakes recorded previously, according to the U.S. Geological Survey.