The Nikei 225 index has begun rising again as the long-term effects of Japan's devastating earthquake are allayed.

The index has risen to a value of 9093.72, an increase of nearly 6 per cent on the past few days' massive plunge.

This has sparked a rush for bargain purchases following the mass sell-off of stocks, as the value of the these stocks are expected to rise again after the nuclear plant problems are fully neutralised.

Misguided short-selling, where shares are borrowed in a market which looks to be declining, sold immediately, then bought back - hopefully at a lower price than they were sold for - to return to the lender, netting the borrower a profit on the difference, is also thought to be contributing to the strong rebound in the Japanese markets. Many bets were taken on the Japanese markets falling further, and now that long-term effects of the disaster are apparently under control, traders have realised their predictions were rash and are attempting to cover themselves.

Nevertheless, uncertainty in the Japanese markets is still rife, with events at nuclear power plants, especially Fukushima Daiichi, being closely watched.

Earlier it emerged workers managing the nuclear reactors in the attempt to prevent a meltdown have been evacuated from the plant as radiation levels reached 10 millisieverts per hour.