how sure are you?
I happened to read this and I have 2nd thought:

Earthquakes: Qatar, like most of the Gulf states, lies within an earthquake zone. Though under-evaluated, structures of any type built on landfill would be particularly susceptible to liquefaction should there be an quake epicentered in Iran or elsewhere in the region.
https://www.osac.gov/Reports/report.cfm?contentID=62019