Tokyo residents offer prayers and observe a minute of silence on the anniversary of the deadly tsunami that triggered the Fukushima nuclear disaster. The 9.0-magnitude quake -- the fourth strongest in Earth's recorded history -- devastated northeastern Japan 12 years ago. The undersea quake unleashed a tsunami that left around 18,500 people dead or missing and overwhelmed cooling systems at the Fukushima Daiichi plant, leading to the worst nuclear catastrophe since Chernobyl. IMAGES