Defying assertions that earthquakes cannot be predicted, an Italian court convicted seven scientists and experts of manslaughter Monday for failing to adequately warn residents before a temblor struck central Italy in 2009 and killed more than 300 people.

The court in L'Aquila also sentenced the defendants to six years each in prison. All are members of the national Great Risks Commission, and several are prominent scientists or geological and disaster experts.

Scientists had decried the trial as ridiculous, contending that science has no reliable way of predicting earthquakes. So news of the verdict shook the tightknit community of earthquake experts worldwide.

"It's a sad day for science," said seismologist Susan Hough, of the U.S. Geological Survey in Pasadena, Calif. "It's unsettling." That fellow seismic experts in Italy were singled out in the case "hits you in the gut," Hough added.

In Italy, convictions aren't definitive until after at least one level of appeals, so it is unlikely any of the defendants would face jail immediately.

Other Italian public officials and experts have been put on trial for earthquake-triggered damage, such as the case in southern Italy for the collapse of a school in a 2002 quake in which 27 children and a teacher were killed. But that case centered on allegations of shoddy construction of buildings in quake-prone areas.