Jizo Bosatsu although a figure in Buddhism as Hell-Saviour, in fact a savior who will answer prayers of all being for all wishes. You should recite (repeatedly) and learn the Ksitigarbha Sutra for deep understanding. Also to develop the faith in Him.
According to the Ksitigarbha Sutra, we worship by praising the His Name "Namo Ksitigarbha Bodhisattva" which means I take refuge in Jizo Bosatsu. Also by reciting the Ksitigarbha Sutra, then transferring the merit accumulated from reciting the Sutra. We can do worship on bended knees, too. Sincerity and repentance are very important in this worship.
In Japan, people also splash water on Jizo Bosatsu's statue when they say their prayers.
Let's pray to Jizo Bosatsu for the sake of those Tsunami victims. May all beings (especially those tsunami victims) ends their sufferings and free from harms, dangers and all kind of disasters. Namo Ksitigarbha Bodhisattva.