* Nikkei falls closer to 16-mth low after yen hits 15-yr high
* Nikkei seen on downtrend; next targets at 8,800, 8,697
* Europe bank worries, politics also weigh on sentiment
TOKYO, Sept 8 (Reuters) - Japan's Nikkei average dropped more than 2 percent on Wednesday as the yen's advance to a fresh 15-year high against the dollar extinguished an upbeat mood gained from last week's better-than-expected economic data.
A revival of concerns over European banks and uncertainty over the political situation in Japan added to the dour mood.
The Nikkei fell back towards a 16-month low below 9,000 logged last week, hurt by what some market analysts said was selling of futures by short-term investors, though the index will likely find support around 8,800, a level it tested and held a few times in recent weeks.
"With the yen's advance accelerating and worries about credit risks in Europe heightening, the market is pressured by investor concern about risk-taking," said Kazuhiro Takahashi, general manager at Daiwa Securities Capital Markets.
"If inaction by the government despite mentions of intervention by some officials triggers a further advance in the yen, it's hard to think the situation will be fixed soon. As the strong yen is a drag on Japanese stocks, the index could still lose further ground."
The benchmark Nikkei <
> was down 2.1 percent or 195.35 points at 9,030.60 in midafternoon after falling as low as 8,997.63, back towards a 16-month low of 8,796.45 hit on Sept. 1.The broader Topix <
> lost 1.8 percent to 819.99.A Wall Street Journal report reignited concerns about European sovereign debt and banks' exposure on Tuesday, sending stocks down and lifting the low-yielding, safe-haven yen, franc and dollar.
The dollar fell as far as 83.34 yen <JPY=>, a new 15-year low and down 0.5 percent on the day, with traders testing Japanese authorities' pain threshold for currency strength. [
]Bank of Japan Governor Masaaki Shirakawa reiterated on Wednesday his reluctance to return to quantitative easing but indicated the central bank was weighing its options on how to deal with economic impact from the yen's strength.
On the political front, Prime Minister Naoto Kan is seeking to fend off a challenge to his leadership of the ruling party from veteran powerbroker Ichiro Ozawa, with a party vote set for Sept. 14.
Markets are keeping a close eye on political developments as it could spell a potential shift in how the country copes with a strong yen, weak economy and huge public debt. [
]The Nikkei struggled to snap its downward trend, with resistance lying ahead on technical charts.
Wednesday's drop took the Nikkei below 9,190, around its 25-day moving average, which had served as resistance from August until this week. The 25-day moving average is considered a proxy for a one-month moving average and is closely watched in Japan.
Market analysts see strong support around 8,800, and after that, the next target is 8,697, a 61.8 percent retracement of the Nikkei's rally from its March 2009 low to its April 2010 high.
Shares of blue chip exporters lost ground. Investors fret about a stronger yen as it eats into exporter profits.
Sony Corp <6758.T> fell 2.3 percent to 2,456 yen and Canon Inc <7751.T> shed 2.2 percent to 3,505 yen. Honda Motor Co <7267.T> skidded 2.9 percent to 2,734 yen.
Many Japanese companies have assumed a dollar/yen rate of 90 yen and euro/yen rates of 110-115 yen in the year to March 2011. (Reporting by Aiko Hayashi; Editing by Chris Gallagher)