* Nikkei weaker, partly offset by positive earnings news
* Caution dominates ahead of BOJ decision due later Tues
By Tomo Uetake
TOKYO, July 31 (Reuters) - Japanese shares fell for a one-week low on Tuesday morning, as traders braced themselves for the Bank of Japan's policy decision amid expectations it could tweak its massive asset-buying.
The benchmark Nikkei share average .N225 dropped 0.50 percent to 22,432.75 in mid-morning trade, with trading activity largely subdued ahead of the BOJ's policy announcement due later Tuesday.
"Despite some positive earnings-related news, the market looks very cautious ahead of the BOJ's decision, including a possible tweak to its ETF buying," said Yasuo Sakuma, chief investment officer at Libra Investments.
"A continued tech sell-off on Wall Street also soured investors' sentiment."
Reuters and other media have recently reported that the BOJ mulls ways to make its massive stimulus programme more sustainable and could review the allocation of ETF purchases. a widespread sell-off of technology stocks pushed the three major U.S. stock indexes lower, with the Nasdaq Composite .IXIC posting its third consecutive loss of more than 1 percent for the first time in three years. the overall weakness, Gurunavi 2440.T soared 17.5 percent after e-commerce firm Rakuten 4755.T announced a tie-up with the restaurant finder site after the market close on Monday. 4755.T added 1.0 percent.
Positive earnings also helped some stocks.
Capcom 9697.T jumped 9.1 percent to its highest level in 18 years after the game maker's net profit for the April-June quarter grew 7.5 times from a year earlier, thanks to a big success of "Monster Hunter." Corp 4921.T , TDK Corp 6762.T and Oriental Land 4661.T climbed between 2.2 and 5.6 percent after the companies announced upbeat quarterly results. broader Topix .TOPX fell 0.89 percent to 1,752.33, while the JPX-Nikkei Index 400 .JPXNK400 was down 0.76 percent at 15,502.44.
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