Discount the USD effects against the current AUD sell-off at your peril. USD is still the globe's reserve currency. The investment community (the bulk of which are based in the US) are long AUD stocks and bonds. US financial institutions own 40% of Telstra stock, 25% of the big 4 banks here.Asian pension funds are dropping AUD securities also (esp Japan). Returns are falling, non-mining investment is exiting. Lets not forget that China owns the bulk of US debt now as well. If it's rumoured Soros went short AUD @ 1.03-4 v USD then the world listens.
Put it this way, in watching this sell-off I have totally discounted anything happening with the UK economy, and even any news out of China. Any big swings overnight have been attributable to what the US Fed is saying re ending QE. Watch GBPUSD v AUDUSD and you will see what I mean. When you factor in the impact of the technically driven computer programmes trading the markets, then the herd mentality on USD becomes further exacerbated.