Not due to a 'single reason'- it's more a story of seasonality; China's economic outlook and varying 'expert' opinions on same; as well as international intrigue, as JST was caught up in the Anti China frenzy of the past year. Like I said on another site- I can't wait for the book!
Go back 5-7 yrs on the charts and look at the volume profile on past JST breakouts- eerily similar to what is ocurring presently (history echoing!!).
Just observations - to be useed for entertainment only-