Tell them there are different kinds of faults (strike-slip, normal, and reverse faults). If you have pictures of faults and fault ruptures, now is a good time to share them with your students.
More information: Jack Williams et al, Along-strike extent of earthquakes on multi-segment reverse faults; insights from the Nevis-Cardrona Fault, Aotearoa New Zealand, Seismica (2024).