Currency? Do you have a source on revised infrastructure damage figures, because I've only seen $100-150 billion estimates by some insurance companies.
Christchurch is $12b, and there have been whole cities leveled in japan, a whole prefecture is majorly affected if not downright destroyed.
$150b seems very low.
The Christchurch figure is a debatable one, as the government is talking it up so as to justify an asset sale (national park mining and power companies are current favourites) while the true figure seems unknown (I can't find a good source, any you know of?). The EQC only pay part of some claims, but here are their stats http://canterbury.eqc.govt.nz/repair-replacement/progress
They are also rapidly losing their nuclear power plants permanently.