Market Internals update at 15:30ET

NYSE volume 506M shares, 4% below its one-month average; Advancers lead decliners by 1.2:1 - - NASDAQ volume 7.78B shares, 16% below its one-month average; Decliners lead advancers by 1.2:1 - - VIX index +1.0% at 16.77