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BOSTON (MarketWatch) -- The CBOE Volatility Index vix (VIX 32.80, +7.89, +31.67%) surged to a session gain of more than 60% Thursday afternoon as stocks collapsed on worries Greece's debt woes could spark a wider credit contagion. Known as the market's antiestéticar gauge or VIX, the benchmark tracks implied market volatility using options contracts based on the S&P 500 Index (SPX 1,128, -37.72, -3.24%) . The Dow Jones Industrial Average was down nearly 1,000 points at one point Thursday afternoon before bouncing back, and was off about 500 points, or nearly 5%, in recent action. The iPath S&P 500 VIX Short Term Futures ETN /vxx (VXX 27.31, +1.19, +4.54%) added 16%.