Mount Hood December 2023 EQ Swarm Support Graphic

Mount Hood, Oregon, earthquakes from a swarm that occurred December 8-13, 2023 as compared to previous earthquakes. The recent earthquakes are shown with red circles. Earthquakes that have occurred since 2010 are shown as unfilled gray circles. All circles are sized by their magnitude. Top: Map view of seismicity at Mount Hood. Solid gray lines are known earthquake faults. Blue triangles are volcano monitoring stations. The line between A and A' is the cross section depicted in the lower graphic. Bottom: Cross-section of seismicity at Mount Hood. Symbols are the same as in the map view. The topography (surface) of Mount Hood is shown with the black line near the top of the plot.