This paper focuses on two mega natural disasters that occurred in Asia: the Great East Japan Earthquake in March of 2011 and the Chao Phraya Floods from August to December of 2011. In a close analysis of the damage caused by each hazard, we will try to investigate why Japan had suffered such huge damages by the earthquake and tsunami although the country was thought to have a high level of protection for such hazards. In the case of the Thai floods, there were certain locations where Japanese manufacturers particularly suffered serious damages. We will also try to clarify why damages concentrated on certain locations in relation to economic incentives that Thailand had offered to attract foreign companies.This paper also proposes potential countermeasures for mega disasters, discussing what measures are required |