After the intensive earthquake on March 11, Japan has closed its ports and airports. Also, the damage to the roads and port facilities will impact transport and logistics.
It may to some extent influence Japan's import and export in the short term, including silk, but the impact may not be so large.
Japan was one of the biggest silk producers at one time, but due to the direction of Japan's national economic development, its silk industry has gradually withered away, since mid-1990.
Now most of Japan's silk demand is sourced from China. The amount of Japanese silk imports from China is bound to decrease after the intensive earthquake on March 11.