Where do the most powerful earthquakes on Earth occur?

Most earthquakes happen at or near the boundaries between Earth's tectonic plates

Explanation:

because that's where there is usually a large concentration of faults. Some faults crack through the Earth because of the stress and strain of the moving plates.

If you don't know where the tectonic plates are there is a lot of maps out there :>

theres these platetechtonics at the bottom of some places at earth, but i dont know where.

very