Aug. 13 (Bloomberg) -- Bank of Japan board members last month indicated they were worried about the yenâs advance, a sign they see the currencyâs threat to exporters as a bigger economic risk than fallout from Europeâs sovereign-debt crisis. âWith regard to the recent appreciation of the yen and fall in Japanese stock prices, some members said that the effects on Japanâs economic activity should be examined closely,â minutes of a July 14-15 meeting published today in Tokyo showed. A weakening U.S. economy spurred the yenâs climb to a 15- year high against the dollar this week. It has fallen since Finance Minister Yoshihiko Noda and central bank Governor Masaaki Shirakawa said they are closely watching the currency, comments investors say indicate preparedness to curb currency gains to protect the nationâs economic recovery. âThe chance the BOJ will ease policy at the September meeting or hold an emergency meeting is risingâ unless the yen stems its gains, said Hiroaki Muto, a senior economist at Sumitomo Mitsui Asset Management in Tokyo. http://noir.bloomberg.com/apps/news?pid=newsarchive&sid=aRrjsoS1iwHY