Mount St Helens time vs depth plot 1988-2023

Summary of earthquakes at Mount St. Helens during non-eruptive periods.  Top: Events per week (upper graphic), earthquake depths between 1987 and Sept. 2004 (lower graphic), and histogram (on right) showing earthquake depths.  Earthquake circles are sized according to magnitude. Previous time periods of high earthquakes rates are denoted as light red boxes.  These time periods have been previously interpreted as recharge. Bottom: Events per week (upper graphic), earthquake depths between 2008 and the present (Oct 2023) (lower graphic), and histogram (on right). Symbols and lines are the same as above. Orange dots and areas denote the current activity.