An incredible 11 major quakes, mag 6 or higher have been recorded by USGS since Hamas attacked Israel just over a week earlier, this is indeed impressive until we look a little deeper, or indeed a lot shallower!
Of the 11 registered major quakes since the attack, at least four have been registered as mining or null explosions.
I once emailed USGS to ask them what a 'null' quake was, and they answered probably a mining explosion . . .
However, many of these 'null' quakes are registered thousands of kilometres away from land so this would have to be something else. An underwater volcano for instance, or maybe something a little more sinister, nuclear testing?More from USGS here