L'AQUILA, Italy -- In a verdict that sent shock waves through the scientific community, an Italian court convicted of manslaughter on Monday seven experts for failing to adequately warn residents of the risk before an earthquake struck central Italy in 2009, killing more than 300 people.

The defendants, all prominent scientists or geological and disaster experts, were sentenced to six years in prison.

Earthquake experts worldwide decried the trial as ridiculous, contending there was no way of knowing that a flurry of tremors would lead to a deadly quake.

That fellow seismic experts in Italy were singled out in the case "hits you in the gut," she said.

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

Italian officials and experts have been prosecuted for quake-triggered damage in the past, including a 2002 school collapse in southern Italy that killed 27 children and a teacher. But that case centered on allegations of shoddy construction in quake-prone areas.

Among those convicted Monday were some of Italy's best known and most internationally respected seismologists and geological experts, including Enzo Boschi, former head of the National Institute of Geophysics and Volcanology.

"I am dejected, desperate," Boschi said. "I thought I would have been acquitted. I still don't understand what I was convicted of."

The trial began in September 2011 in this Apennine town, whose devastated historic center is still largely deserted.

The defendants were accused of giving "inexact, incomplete and contradictory information" about whether small tremors felt by L'Aquila residents in the weeks and months before the April 6, 2009, quake should have been grounds for a warning.

The 6.3-magnitude temblor killed 308 people in and around the medieval town and forced survivors to live in tent camps for months.