Maps of Yellowstone Lake earthquake swarm (2008-2009) with a model ...

A. Location of earthquakes at the north end of Yellowstone Lake, with the direction of spreading of the deep fracture modeled as a vertical volcanic dike showing seismic and ground displacement data. B. Model of expansion of a single dike into three segments with different rates (upper and lower) used to explain the modeled displacement and related seismic activity.