Just like you said: in front of nature, people are so small, and life is sometimes as fragile as a little ant. Mother Earth can choke thousands of people with a sneeze! "Man can conquer nature" is too difficult. I only fear nature!
Today's world can't make an accurate prediction of earthquakes. Once an earthquake happens, especially a big earthquake, first, you can only rely on your own luck; Second, rely on your own knowledge of earthquake prevention and escape; Third, rely on external assistance.
Geographically speaking, Shenzhen is a very safe earthquake or tsunami, and it is auspicious and benevolent! Don't worry!