[LiviuM]

Found these on the internet, they seem very interesting, so I thought to share them:
Article: STEEL BUILDING DAMAGE CHRISTCHURCH EARTHQUAKE 22-2011 NEW ZEALAND

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More information regardin the response spectra:

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That high amplification in second 1 looks very frightening. I thought that as the modal period increases the amplification lowers. This is all wrong.

[LiviuM]

More info can be found on:

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[iceman84]

An interesting comparison is between the response spectra from the aSeptember 2010 earthquake and the response spectra from the February 2011 earthquake.