Catholic Japan

Help them with alms and prayers: http://www.caritas.org/.

Votive prayers in time of earthquake:

Omnipotens sempiterne Deus, qui respicis terram, et facis eam tremere: parce metuentibus, propitiare supplicibus, ut cujus iram, terrae fundamenta concutientem expavimus, clementiam contritiones ejus sanantem jugiter sentiamus. Per Christum Dominum nostrum. Amen.

For more see here.