If you don't like the art for cyclone, I hope you are talking the old art.
have you seen this topic:
http://www.civproject.net/forum/viewtopic.php?t=450&postdays=0&postorder=asc&start=45
about the tidal wave/tsunami-subject: In fact I have no strong opinion on if a calamity is missing. For myself I'm happy with the current set. As I checked this before even start drawing. I mean, before starting research and drawing I first wanted to be sure this is the set. otherwise I wouldn't start. The calamities chosen aren't just picked random disasters.
There might even be more calamities that would be missing,
but you gotta draw a line somewhere.
Other calamities could include
landslide, blizzard, lightning, avalanche, lahar, sinkhole, maelstrom, seiche, minor ice age, tornado, etc. But I don't miss em. The only two that I would miss are
locust swarm and
wildfire, but not much. As I mentioned, you gotta draw a line somewhere.
For the equality of some calamities:
Before starting to draw new images I first did some good research on each calamity. This way I found out the exact difference between the calamities.
city riots are some minor form of
civil disorder (though only in cities) but it's a 'minor' calamity
a
tempest is a sudden storm at see and a 'minor' form of
cyclone.
barbarians are known to be any foreign and unknown neighbouring civilization that's just a pain in the ass, where
pirates are specificly NOT of a certain civilization and are set to come from or operate at see. (therefore the later vikings are not regarded pirates although they came from the see)
Tribal conflict is a 'minor' form of
civil war.
These are just a few examples of where the 'minor' calamity is introduced.