A record-breaking deep earthquake registered in May 2025 offshore of Japan likely was not a tectonic event, but triggered by a mineralogical shift in Earth’s mantle.

As more space junk is falling to Earth uncontrolled, scientists are using seismometers to track the debris.

But for busy people, here’s a summary of things you should know about what to do before, during and after an earthquake in Japan. If you’re on public transport: Follow the same guidelines ...