When plate boundaries occur in continental lithosphere, deformation is spread out over a much larger area than the plate boundary, so earthquakes occur away from the plate boundary and are related to strains developed within the broader zone of deformation caused by major irregularities in the fault trace.
One study that focused on risk assessment of mental illness and violence found that the stigma attached to such illnesses prevents those who require help from actually seeking it. The study pointed out that since 1983 there have been 78 mass shootings in the U.S., resulting in 547 deaths. The mental health of the shooters was the mediaâs prime focus in each case. Mental status aside, in the past decade alone, gun-related violence accounted for the deaths of over a quarter of a million people.
According to sources, 18 of these casualties were children. This is the second mass shooting in the US this week, after a gunman opened fire in an Oregon shopping mall on Tuesday, killing 2. ABC News reports that there have been 31 school shootings in the US since Columbine in 1999, when 13 people were killed. The rate of people killed by guns in the US is 19.5 times higher than similar high-income countries in the world. In the last 30 years since 1982, America has mourned at least 61 mass murders. Below is a timeline of mass shootings in the US since the Columbine High massacre: December 11, 2012. On Tuesday, 22-year-old Jacob Tyler Roberts killed 2 people and himself with a stolen rifle in Clackamas Town Center, Oregon. His motive is unknown.