New York  - Google Inc reported a 30-per-cent jump in first- quarter earnings Thursday to 1.31 billion dollars, allaying fears that the internet search engine leader was struggling with the effects of a US economic slowdown.

Revenue also climbed 42 per cent to 5.19 billion dollars, with more than half its sales coming from outside the United States, the company said after market close.

Google's shares shot up more than 11 per cent in after-hours trading as the earnings report beat analysts' estimates.

"People said 'Google can't keep defying the laws of gravity,' but it looks like Google is flying high again," Jerome Dodson of Parnassus Investments told Bloomberg News. (dpa)