May 18, 1980 -- Mount St. Helens Erupts
The eruption was the most significant volcanic eruption to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California. It has often been declared as the most disastrous volcanic eruption in U.S. history. The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a large bulge and a fracture system on the mountain's north slope.
Let's segue to the mainland where fracking has caused thousands of earthquakes in Oklahoma, chipping away at the North American Plate. A chapter in Oklahoma's history -- During the 19th century, thousands of Native Americans were expelled from their ancestral homelands from across North America and transported to the area including and surrounding present-day Oklahoma. The Choctaw was the first of the Five Civilized Tribes to be removed from the Southeastern United States. The phrase Trail of Tears originated from a description of the removal of the Choctaw Nation in 1831, although the term is usually used for the Cherokee removal. Seventeen thousand Cherokees and 2,000 of their black slaves were deported.
Just east of Oklahoma we find Arkansas which is part of the New Madrid Fault Zone.
A large earthquake there will be devastating to the US.
This is another area of speculation as we prepare for, and anticipated a major shake-up.