GLOBAL MARKETS-Growth worries slam stocks, oil, emerging markets

* Risk aversion sends U.S. shares lower* Equity volatility continues, VIX Index hits highest since 2012* U.S. Treasuries up, 30-year bond yield lowest since June 2013(Adds U.S. market open, changes byline, changes dateline, previously LONDON, recasts lead)By Yasmeen AbutalebNEW YORK, Oct 10 (Reuters) - An index of global equities fell to a seven-month low and oil hit a two-year low on Friday, cont