The economics of Japanese earthquake insurance

Here is one interesting bit:

…very few people in that region of Japan held earthquake insurance, and also because of strict loss limits imposed by the Japanese government. For instance, residential buildings and furniture can be covered, but very expensive jewellery and artwork cannot, and there are rules that ban people from taking out insurance once an earthquake warning has been issued.

Mr. McGillivray said the Japanese government protected domestic insurers by limiting foreign participation in the system and, to keep the risks manageable, limited the payouts.

Are the capital requirements on Japanese insurance companies well-designed?  Probably we will find out.  Can anyone recommend readings on this and related questions?