Hello, Fara chan!
Thank you for adding me as your friend at Facebook
We have frequent, but very small earthquakes in Japan. I think you can get accustomed to them quickly (my Turkish brother-in-law did).
Luckily, there is no war around Japan; this summer, however, 120 people died because of excessive heat. I wore a long-sleeve coat in the UK, but Japanese summer is like a steam bath! I recommend you not to visit Japan between June to September...