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This question might have rose in your mind too, that why VIX was lower than yesterday despite the huge selloff today.
This is what I think happens . A thread.


What is VIX ?
https://t.co/VOkAwGRsHL


What is IV ( implied volatility ) ?

Now my explanations. IV is simply demand and supply. IV is back calculated from option prices and not given by the BSM model. When demand for options ( by buyers) are high, IVs will be high. When supply of options ( by sellers) are high, IV will be low.

Now look at this chart. Nifty fut and VIX are plotted together ( red line is the VIX). Yesterday's massive breakdown forced traders to hedge their positions by buying puts ( could be cash holdings, could be future longs, could be sold puts). This excess demand spiked up IVs /VIX