CBOE Vix call volume is heavy today, with nearly 130,000 calls trading by noon ET, or twice the avg daily pace of volume. Activity is concentrated in upside strikes, with a buyer of 10000 Oct 45 calls for 32.5cents earlier today, and a ratio spread trading in which a customer sold 5000 Oct 35 calls for 95cents against a buy of 10,000 Oct 42.5s for 40cents. VIX spot is near 22.25, the low end of the range since May.