"The energy is estimated at a whopping 3.8 kilotons of TNT (about one fourth the energy of the 'Little Boy' bomb dropped on Hiroshima), so this was a big event," he continues. "I am not saying there was a 3.8 kiloton explosion on the ground in California. I am saying that the meteor possessed this amount of energy before it broke apart in the atmosphere. The map shows the location of the atmospheric breakup, not impact with the ground.
The fact that sonic booms were heard indicates that this meteor penetrated very low in the atmosphere, which implies a speed less than 15 km/s (33,500 mph).
"This meteor was probably not a Lyrid; without a trajectory I cannot rule out a Lyrid origin, but I think it likely that it was a background or sporadic meteor."