Find sites hit by google updates?

Hi does anyone know anyway or source for finding sites which were hit by Google Updates - like penguin, panda.

I could manually track sites using semrush but want to see if there are any creative ways for doing this.

Cheers,
AgentZero

search keywords "payday loan" "weight loss" and check all site ranking in top 10 you will surely find few sites with spam backlinks that will get penalized in few days.

Yes, search for spammy keywords, note down serps, then return in a week and check again, you will have your answers.

Thanks guys, should had been more specific.

Not really looking for spammy sites.

Looking for quality sites which had decent content but were spanked by G for backlinks for being naughty with their backlinking.

I don't think there is any easy way to do this, but just wanted to see if anyone had suggestions here.