UPDATE 9-Oil jumps on Middle East worries, economic hopes
* Brent, U.S. crude hit eight-week highs
* Middle East tensions reinforce geopolitical risk premium
* Coming up: U.S. Aug crude expiry on Friday (Recasts, adds analyst comment, detail paragraphs 4, 10-12)
NEW YORK, July 19 (Reuters) - Oil prices rose a seventh straight session on Thursday, reaching an eight-week high, as Middle East tensions reinforced concern about potential supply disruptions while strong corporate earnings lifted investor optimism.
Brent jumped more than 2 percent and U.S. crude rallied 3 percent the day before the U.S. August contract expires.
Brent posted the biggest percentage rise over seven consecutive sessions, 10 percent, since early July.
"The complex surged to the upside largely on geopolitical issues related to a renewed clash of rhetoric between Israel and Iran and civil unrest in Syria," Jim Ritterbusch, president at Ritterbusch & Associates, wrote in a note.
Wednesday's attack that claimed the lives of top officials in Syrian President Bashar al-Assad's inner circle and the Bulgarian bus bombing that killed Israeli tourists -- an act Israel blamed on Iran -- reinforced fears that oil shipments could be disrupted.
Brent September crude jumped $2.64 to settle at $107.80 a barrel, having reached $108.18, the highest price since front-month Brent hit $109.36 on May 22.
U.S. August crude rose $2.79 to settle at $92.66 a barrel, having swung from $89.86 to $92.90, the highest front-month intraday price since crude hit $93.01 on May 22.
U.S. September crude tacked on $2.80 to settle at $92.97 a barrel.
As the change of front-month contracts neared, total U.S. crude trading volume outpaced Brent turnover. U.S. volume exceeded the 30-day average by 6 percent, while Brent lagged its 30-day average by 20 percent.
Brent has gained around 22 percent since falling to an 18-month low in June. It had slumped since the year's high above $128 in March, amid worries that demand would slow due to Europe's debt crisis and weaker growth in other regions.
North Sea production problems, including the recent strike in Norway, along with the concerns about Iran's dispute over its nuclear program have supported Brent.
The supply also have kept the premium of Brent's front-month over the nearby contract LCO-1=R elevated, and it reached 92 cents intraday on Thursday.
Analysts said the geopolitical concerns outweighed the latest U.S. Energy Information Administration supply report released on Wednesday, which showed crude inventories in the world's top consumer fell less than expected last week.
"Overall, we are more concerned about the latest bombings in Syria and Bulgaria than about the DOE statistics," Olivier Jakob, analyst at Petromatrix, said in a report.
European equities hit a four-month high on strong corporate earnings, while U.S. stocks rose, with the S&P 500 index hitting a 2-1/2-month high after briefly paring gains on weak economic data.
Reports showed jobless claims rose last week, factory activity in the U.S. Mid-Atlantic region contracted for a third straight month and home resales fell. The data briefly pared Wall Street gains, but also fueled hopes that the U.S. Federal Reserve will act to keep the economy growing.
"Bad data is good when it comes to stimulus hopes," said Phil Flynn, analyst at Price Futures Group in Chicago.
MIDDLE EAST TURMOIL
Russia and China vetoed a U.N. Security Council resolution that threatened Syrian authorities with sanctions if they did not halt violence against an uprising.
Syrian rebels battled into the heart of Damascus against government troops who used artillery and helicopter gunships on their own capital in retaliation for the assassination of President Assad's security officials.
Oil has been lifted by escalating tension between Iran and the West over Iran's nuclear work. Sanctions and a European Union embargo have cut Iranian exports and Iran has repeatedly threatened to close the Strait of Hormuz, a key oil transit route, unless they are revoked.
On Wednesday, U.S. Defense Secretary Leon Panetta said the United States will hold Tehran directly responsible for any attempt to disrupt shipping in the Gulf region and will be able to defeat any Iranian attempt to shut down seaborne commerce.
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