Mt. St. Helens Insights & Analysis
Expert monitoring data provided by Cascades Volcano Observatory (CVO)Mount St. Helens is the most active volcano in the contiguous United States and is best known for its catastrophic May 18, 1980 eruption. This event triggered the largest landslide in recorded history and remains a benchmark for volcanic hazard monitoring in North America. Today, Mount St. Helens is managed by the Cascades Volcano Observatory (CVO). Monitoring efforts in 2026 focus on the ongoing dome-building activity and the continuous seismic shifts within the crater. It serves as a reminder of the power of a volcanic eruption and the importance of professional, real-time alerting systems like MagmaAlert.