CNN:
A rogue wave measuring 58 feet (17.6 meters) tall was recorded off the coast of Vancouver Island, breaking the record for proportionality at three times the size of surrounding waves.
"Only a few rogue waves in high sea states have been observed directly, and nothing of this magnitude.
...
"Rogue waves are generated by wind, so they are just a rare occurrence of wind generated waves. Whereas a tsunami is generated most commonly by an earthquake, underwater earthquake, or as we've seen recently a volcano eruption"