General Discussion

The video of the explosion:

From the video it shows the explosion is small. The cameraman is pretty close to the impact site as you don't hear the audio lag from seeing the explosion to the sound that would say it's far away. Sounds travels at 1,100 feet per second, so cameraman was probably around 100 feet away since the blast and sound occur at the same time. The Israeli video of the damage does support that.

Also Hamas rockets contain 10 to 50lbs of explosives for a small explosion like that, with minimal damage to the vehicles and buildings. A typical Israeli bomb contains 200 to 1,000lbs of explosives which would flatten the area and leave a crater. Israel has a smaller SDB bomb now that has 50lbs of explosives. But the explosion damaged looked like it was less than 50lbs.

Also a small explosion like that wouldn't kill 500 people like Hamas claims. Maybe up to 50 people if it hit a crowd.