TOKYO, July 30 (Reuters) - Japanese government bond (JGB)

yields jumped on Thursday, tracking yields on U.S. long bonds,

which rose on worries that the Federal Reserve may fall behind

the curve in coping with inflation.

Here are a few details:

* The 10-year JGB yield rose 5.5 basis points

(bps) to 2.800%. The five-year yield rose 4.5 bps

to 2.025%. Yields move inversely to bond prices.

* Yields on the 30-yearU.S. Treasuries climbed to 19-year

highs in Asia on Thursday as doubts over the Fed's resolve to

rein in inflation prompted investors to seek more insurance

against inflation risks.

* Japan's two-year yield was flat at 1.47%

after an auction for bonds with the same maturity witnessed a

moderately firm outcome.

* "The auction received decent demand because the yield

level was high, and that boosted appetite from banks," said

Katsutoshi Inadome, senior strategist at Sumitomo Mitsui Trust

Asset Management.

* The market is gauging the impact on JGBs of the massive

earthquake that hit Japan's southern Kumamoto Prefecture earlier

this week.

* Yields could go either way, as the damage could lead Japan

to issue more bonds to finance reconstruction, while supply

chain disruptions could hurt the economy, said Inadome.

* The 30-year yield rose 3 bps to 3.960%.