New research suggests glacier melt driven by climate change is increasing the risk of giant waves.
Japan's meteorological agency warns another, stronger earthquake may hit in the next week.
The quake struck between the islands of Manado and Ternate. Tsunami warnings have now been lifted.
About 8.2 million people participated in the first drill of the year, achieving an average evacuation time of 1 minute and 52 seconds.
Shree Jaya Devi school, which teaches 119 children, is rebuilt with the help of Manx funding.
The powerful earthquake shook southern and central Mexico on Friday, also leaving several people injured.
The 6.5 magnitude trembler shook buildings and set off the country's earthquake alert system.
The 3.7-magnitude seismic event shook homes up to 60km away when it struck in October.
Areas of Perthshire and the western Highlands, southern parts of Wales, and Yorkshire and Lancashire saw the most seismic activity, British Geological Survey data shows.
