This type of quake has been felt all over the world after the detonation of a nuclear weapon. There is very little actual data that is readily available on this type of quake, but, of the two types of of earthquakes it is the only type that can be easily predicted and controlled. We have written many articles about earthquakes for Universe Today.
It was also the first publicly recognized by Obama since the elementary school massacre, which claimed the lives of 27, including 20 children. There have been six mass shootings over the past nine months -- and at least 20 during Obama's presidency. That may be disturbing. But some would argue even that startling figure grossly underreports the number of shooting sprees.
A mass shooting is defined as a single shooting incident which kills or injures four or more people, including the assailant. School shootings: There were 64 school shootings in 2015, according to a dedicated campaign group set up in the wake of the Sandy Hook elementary school massacre in Connecticut in 2012. Those figures include occasions when a gun was fired but no-one was hurt.