[traumer]

Can aftershocks be stronger?

[Cringing Negativism Network]

“Can aftershocks be stronger?”

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Yup...

Except then they’re not aftershocks.

Otherwise yes.

[Strategerist]

Can aftershocks be stronger?

If the aftershock is stronger then technically this quake would become a foreshock and the aftershock the mainshock.

Yes, it's possible this is a foreshock to a larger quake. It's far more likely it isn't. Unfortunately, you can't tell which is true beforehand.