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.
Many much smaller tremors had rattled the area in the previous months, causing frightened people to wonder if they should evacuate.
"I consider myself innocent before God and men," said another convicted defendant, Bernardo De Bernardinis, a former official of the national Civil Protection Agency.
Prosecutors had sought convictions and four-year sentences during the trial. They argued that the L'Aquila disaster was tantamount to "monumental negligence," and cited the devastation wrought in 2005 when levees failed to protect New Orleans during Hurricane Katrina.What about the Italian economists who thought leaving the Lira for the Euro was such a great idea?