stuck on past exam paper question, help will be great?

jai ho!!™

New member
the question is:

using your knowledge, explain how a major earthquake might be predicted by monitoring minor changes in seismic activity prior to the earthquake event.

So far I have thought about- the seismic gap theory but thought that it cannot be right as the question is asking me seismic changes prior to the earthquake

and i though about mild tremors??

any suggestions would be greatly appreciated as my exam is tomorrow!
 
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