The S&P/ASX 200 index dropped 61.6 points, or 1.3 percent, to 4,841.5 at the close of trade, its lowest since mid-2013. The benchmark is down 8.6 percent so far this year.
New Zealand's benchmark S&P/NZX 50 index dipped 10.5 points, or 0.2 percent, to finish the session at 6,113.7.