Blame being put on the stock market tumble
The USDJPY has moved lower over the last hour of trading (moved above 52 pips in the last hour of trading), and in the price has retraced to the 50% of the weeks trading range (that level comes in at 100.953. The low just extended to the 100.945). The 200 hour moving average is currently at 101.00. That is also stalling the fall for now.