With the lackluster economy hurting many corporations here and elsewhere, Wall Street is expecting the gloomiest round of third-quarter earnings from the nation's biggest businesses since 2009.

So far, analysts say, there is no evidence the Bay Area is falling off the same cliff.

"I think it's kind of hard to bet against technology companies in Silicon Valley," said Roger Kay, an analyst with Endpoint Technologies Associates, noting that in the past, "they have defied gravity pretty well."

Indeed, Apple (AAPL), Cisco Systems (CSCO) and Oracle (ORCL), which reports its earnings Thursday, are among those performing well.

But not every Silicon Valley company is putting up solid numbers. Intel (INTC), Hewlett-Packard (