* Spain's bank bailout fans fears of debt crisis spreading
* Tensions rise in Korean peninsula; Korean won slumps
* Money market strains add to nervousness (Adds comment, updates prices, changes byline)
By Gertrude Chavez-Dreyfuss
NEW YORK, May 25 (Reuters) - The euro plunged to an 8-1/2-year low against the yen and neared a four-year trough versus the dollar on Tuesday, as Spain's weekend takeover of a small bank fueled fears of systemic risks within the banking system that could hurt global growth prospects.
A slide in global stock prices and escalating tensions in the Korean peninsula also drove investors to flock to the yen and dollar for safety, attracted by the generally stable financial systems of the United States and Japan and the high liquidity of their currencies.
"The general fear is that developments in Europe would have a much broader global impact. Increasingly, market participants are getting scared and fearful that we may have a repeat of late 2008," said Camilla Sutton, senior currency strategist at Scotia Capital in Toronto.
The Bank of Spain on Saturday said it had taken over a small savings bank, CajaSur. Analysts said the bailout highlighted weakness in the European banking sector and spurred worries that more banks may need to be bailed out at a time when European countries are trying to repair their public finances.
In early afternoon New York trading, the euro was down 0.3 percent at $1.2322 after coming off a session low at $1.2177. The euro last week touched a four-year low of $1.2143 on electronic trading platform EBS <EUR=EBS>.
Sutton said she expects the euro to breach that four-year low, with $1.18 the next key level.
The euro has lost 7.8 percent against the dollar so far this month and is heading for its biggest monthly fall since January 2009 at current prices.
Against the yen, the euro fell to around 108.85 yen <EURJPY=EBS>, its lowest since late November 2001, according to EBS. It last changed hands at 110.77, down 0.5 percent.
Tensions on the Korea peninsula also buoyed the dollar and yen after South Korea's Yonhap news agency said North Korean leader Kim Jong-il had told his troops to prepare for combat. The South Korean won <KRW=> fell nearly 5 percent at one point. For details, see [
]Investors were also on edge after three-month dollar Libor rates soared to 10-month highs July as banks became more cautious about lending to European institutions after the Spanish bail-out over the weekend. [
]U.S. two-year swap spreads <USD2YTS=RR> , a key gauge of financial system stress, rose to one-year highs on Tuesday.
The ICE Futures U.S. dollar index <.DXY>, which tracks the greenback against a basket of six currencies, rose 0.9 percent to 86.965.
Against the yen, the dollar fell 0.3 percent to 89.93 <JPY=>. Sterling was down 0.3 percent at $1.4381 <GBP=>.
Growth-linked currencies such as the Australian and New Zealand dollars retreated. The Aussie dropped 1.2 percent against the yen <AUDJPY=R> and fell to a 10-month low versus the U.S. dollar at US$0.8068 <AUD=>.
"Market conditions have been extremely good over the last year or so and people have built up very large positive risk positions," said Aroop Chatterjee, senior currency strategist at Barclays Capital in New York.
"If volatility and risk worsens further, we will see a continued move by investors to cut those positions." (Additional reporting by Wanfeng Zhou; Editing by Leslie Adler)