LOS ANGELES — The number of U.S. homes lost to foreclosure surged in July, another sign lenders are moving quicker to take back properties from homeowners behind in payments.

Lenders repossessed 92,858 properties last month, up 9 percent from June and an increase of 6 percent from July 2009, foreclosure listing firm RealtyTrac said today.

Banks have stepped up repossessions this year to clear out the backlog of bad loans. July makes the eighth month in a row the pace of homes lost to foreclosure has increased on an annual basis.

Meanwhile, homeowners who are falling behind on their payments are being allowed to stay in their homes longer because lenders are reluctant to add to the glut of foreclosed homes on the market.

The number of properties receiving an initial default notice rose 1 percent last month from June, but tumbled 28 percent versus July last year, RealtyTrac said. Initial defaults have fallen on an annual basis the past six months.

The latest data reflect a foreclosure crisis that continues to drag on as many homeowners struggle to make their monthly payments amid high unemployment, slow job growth and an uneven rebound in home prices.

Economic woes, such as unemployment or reduced income, are now the main catalysts for foreclosures. Initially, lax lending standards were the culprit, but homeowners with good credit are now the fastest growing group of foreclosures.