What (Japanese) Buddhists should do to prevent tsunami and other natural disasters?

You probably think that I'm going to talk about prayers or how to pray in Buddhist view about avoiding natural disasters as this is a blog about Buddhism. I'm not a scientist, so I won't talk too much about the geological of Japanese land, sea or whatever. I'm not going to talk about the meteorological side about the disasters.

Who is Mizuko Jizo Bosatsu (Ksitigarbha Bodhisattva)?

While I was searching for information about Jizo Bosatsu's statue (Ksitigarbha Bodhisattva) in Japan, I found a video which shows and briefly introduce the famous savior for Japanese Buddhist believers. They worship and express their prayers to Jizo Bosatsu for many things: good health, safety, safe-pregnancy and delivery, protection for the soul of the dead (including babies, aborted soul, etc.), all success of living, and many other wishes.