Never heard of any quakes in my 10+ years living in SZ. Should be just tremors that don't cause no damages?
Few years back, SZ had a very rare snowing incident. Its pretty much just some layer of ice but everyone was going nuts! Lol. Fyi, Shenzhen is in the southern region where it never snows.
Typhoons are the common troublemaker in SZ. It can even uproot trees. Umbrellas are useless and will just break. Lotsa memories. Its a city that has a ridiculous pace. Things changes fast. I miss the place but am glad to be out of it.