* Japan stocks in biggest decline since October 2008
* U.S., European shares fall on fears over global recovery
* Emerging market stocks up on rebuilding hopes
* U.S. crude dips to $100/bbl on Japan impact on demand
* Dollar rebounds againt yen; gold ticks up (Updates New York trading)
By Rodrigo Campos and Al Yoon
NEW YORK, March 14 (Reuters) - World stocks fell to six-week lows on Monday on fears over the global economic impact from Japan's devastating earthquake and tsunami and as officials grappled with a nuclear crisis.
Oil prices fell on expectations of slower demand from Japan, while growing unrest in a Yemeni area bordering Saudi Arabia, the world's largest oil exporter, limited losses.
Japanese stocks posted their biggest daily decline since October 2008 in record volume as investors speculated on economic losses. The Nikkei index <
> closed off 6.2 percent and the broader TOPIX index < > slumped 7.5 percent.European and U.S. stocks tumbled on fears that the crisis in Japan, the world's third largest economy, could derail a global recovery.
"The earthquake could have great implications on the global economic front," said Andre Bakhos, director of market analytics at Lek Securities in New York. "If you shut down Japan, there could be a global recession."
Credit Suisse estimated Japan's losses could total 15 trillion yen ($183 billion).
Japanese gross domestic product may slide by 1 trillion yen in 2011, or about 0.2 percentage point, Hiromichi Shirakawa, a Tokyo-based economist at Credit Suisse, said in a client note. But deteriorating consumer confidence and production cuts could worsen the GDP drop as much as 1 percentage point, he added.
While many details weren't known, Shirakawa estimated direct and indirect losses would be short of the less powerful January 1995 earthquake that devastated the western port city of Kobe.
The U.S. dollar rebounded from near-record lows against the yen after the Bank of Japan announced a series of policy easing measures to shore up the economy.
Gold rose, recovering some of last week's losses, as the Japanese quake drove safe-haven buying, driving prices toward recent record highs.
The MSCI world equity index <.MIWD00000PUS> inched lower throughout North American trading, falling 1.2 percent to levels last seen in late January. It is down more than 4 percent from its February peak. The Thomson Reuters global stock index <.TRXFLDGLPU> shed 1.4 percent.
Emerging market equities were lifted by construction and refinery shares on expectations of large-scale reconstruction efforts in Japan as the country confronted what officials there called its biggest crisis since World War Two. For details see [
]The pan-European FTSEurofirst 300 index <
> dropped 1.3 percent, while emerging markets stocks <.MSCIEF> rose 0.5 percent.The Dow Jones industrial average <
> dropped 129.69 points, or 1.08 percent, to 11,914.71. The Standard & Poor's 500 Index <.SPX> declined 15.88 points, or 1.22 percent, to 1,288.40 and the Nasdaq Composite Index < > fell 31.93 points, or 1.18 percent, to 2,683.68.The iShares MSCI Japan index exchange-traded fund <EWJ.P> tumbled 8.8 percent, and the Global X Uranium ETF <URA.P> dropped nearly 20 percent
Brent crude <LCOc1> edged lower by 0.8 percent to $112.95 a barrel, while U.S. crude oil <CLc1> fell 1.2 percent to $99.96, pressured by expecatations that oil demand in in Japan, the world's third-largest oil consumer, would fall in the short- to medium-term as economic activity stalls following the quake. Conflicts in Libya and Yemen continued to be eyed by traders.
The dollar index <.DXY>, a gauge of the greenback against a basket of currencies, fell 0.3 percent. The euro was up 0.4 percent at $1.3956 <EUR=> after European Union policymakers surprised markets over the weekend by reaching significant agreements ahead of the March 24-25 heads of state meeting.
The Japanese yen declined 0.2 percent to 81.73. The dollar rebounded from a four-month low against the currency as the Bank of Japan supplied banks with record funds to stabilize the stricken economy.
Most U.S. Treasury debt prices rose on Monday as investors looked for lower-risk assets while trying to gauge the eventual impact of the Japanese disaster and watching political turmoil in the Middle East and North Africa. Benchmark 10-year U.S. Treasury yields fell 0.05 percentage point to 3.35 percent.
Spot gold prices rose $6.90, or 0.49 percent, to $1,423.90 an ounce. (Additional reporting by Edward Krudy and Steven C. Johnson, Robert Gibbons in New York and Japanese markets reporters; Editing by Leslie Adler)