AH! so that's the reason!
(http://www.dailymail.co.uk/news/worldnews/article-1267262/Iranian-cleric-Women-wear-revealing-clothing-cause-earthquakes.html)

And the source for this cleric's statement? Is it Allah checking off his list of no-nos? Of course not! That would be backwards and too politically incorrect. Instead...

"'A divine authority told me to tell the people to make a general repentance. Why? Because calamities threaten us,' said Sedighi, Tehran's acting Friday prayer leader."

Very modern. A nameless god is recommending a general repentance against a nameless infraction. ...but, hey! we all know we're guilty of something. :-)