FOREX-Euro slides as ECB rate cut disappoints market

* Euro tumbles after ECB's rate cut

* BoE slashes rates by 150 bps, sterling slides

* Investors look for bigger rate cuts to boost growth

* Market braces for expected news of big U.S. job losses (Updates prices, adds comment, changes byline)

By Steven C. Johnson

NEW YORK, Nov 6 (Reuters) - The euro fell broadly on Thursday after the European Central Bank cut interest rates by half a percentage point, disappointing investors who thought sluggish economic growth called for a more aggressive move.

The ECB's decision to reduce borrowing costs to 3.25 percent was a relatively small step compared to the Bank of England's surprise decision to slash UK rates by 1.5 points to their lowest in more than half a century.

For full story double-click on [ID:nL6576008].

While rate cuts typically weaken a currency's appeal, analysts said fear of a prolonged recession means investors are rewarding proactive central banks for efforts to boost growth.

Sterling initially rose on the BoE news and the euro came off session lows when ECB President Jean-Claude Trichet said he did not preclude further rate cuts, though investors said the ECB still looks dangerously behind the curve.

"If you believe that currencies whose central banks are proactive in targeting a stronger growth policy by cutting rates aggressively will outperform over the medium term, as I do, then one cannot like the prospects of the euro over the short term," said Dustin Reid, senior FX strategist at RBS Global Banking and Markets in Chicago.

Late afternoon, the euro was down 1.8 percent at $1.2710 EUR= and 2.7 percent at 124.21 yen EURJPY=.

The pound shed 1.8 percent to $1.5629 GBP= after the BoE's surprisingly large rate reduction. Markets had expected the BoE to reduce rates to boost a weakening British economy, but the most aggressive speculation was for a one-point cut.

The Swiss National Bank also surprised investors with an unscheduled rate cut, lowering them by half a point. [ID:nL665760].

The dollar rose 1.6 percent to 1.1775 Swiss francs CHF=, though it fell 0.9 percent to 97.67 yen JPY= as risk-averse investors continued to exit trades of higher-yielding assets financed with the Japanese currency.

GLOOM ON GROWTH, US EMPLOYMENT