Question

explain why not all movement along faults produces earthqakes

Answer 1

Answer:

All movements (absolutely every single one) along faults DO produce earthquakes.

The vast majority just don’t produce quakes big enough for humans to feel… and among those little quakes, there are *constant* microquakes every few milliseconds along every major spreading or subducting boundary on the planet that even instruments can barely detect.

You live on a tectonically active planet: absolutely every earthquake (microquake or megathrust) is perfectly normal.