Actually we don't know that, since most of the reactor building in inaccessible. Also, the latest info from Tepco says that they lost coolant before the tsunami

Actually we don't know that, since most of the reactor building in inaccessible. Also, the latest info from Tepco says that they lost coolant before the tsunami struck, which suggest major earthquake damage. However, if the tsunami hadn't been this severe and they had kept power, perhaps they could have brought the situation under control.