Comparison of February-June 2024 seismicity to previous seismic swarms (1987-2004).

Comparison of February-June 2024 seismicity to previous seismic swarms (1987-2004). Upper left: Map of Mount St. Helens with a grayscale representing a digital elevation model. Earthquakes interpreted as recharge between 1987 and 2004 are plotted as a heatmap of earthquake density. Areas with more earthquakes are in blue (deeper hues) while areas with fewer earthquakes are shown in oranges and browns (lighter hues). The earthquakes associated with the current episode (February-June 2024) are shown as orange-filled circles. Larger circles represent higher magnitudes. Bottom left: Cross-section of the volcano looking north. The topographic outline is shown as a black line at the top of the plot. Top right: Cross-section of the volcano looking west. USGS graphic. Data courtesy of the Pacific Northwest Seismic Network.