McVeigh was executed Rewards_and_punishments by lethal injection on June 11 , 2001 at the U.S. Federal Penitentiary in Terre Haute , Indiana , and Nichols was sentenced Prison to life in prison in 2004 .

The eruption Catastrophe was preceded Process_start by a two-month series of earthquakes Catastrophe and steam-venting episodes , caused Causation by an injection Motion of magma at shallow depth below the volcano that created Creating a large bulge and a fracture system on the mountain 's north slope .

`` Earthquake Catastrophe rates have recently increased Cause_change_of_position_on_a_scale markedly in multiple areas of the Central and Eastern United States ( CEUS ) , especially since 2010 , and scientific studies Scrutiny have linked Connect the majority of this increased activity to wastewater injection Filling in deep disposal wells . ''

The epicenter of the earthquake Catastrophe was in the vicinity of several active wastewater injection wells .