Geotouch Figure 2

A) Topographic map of Mount Rainier and Mount St. Helens regions, Washington state. Rectangular boxes (1, 2) outline volumes projected in B and C. Gray circles are earthquakes and triangles are stations from the Western Washington seismic network. B) Vertical cross section of Mount Rainier. Red and blue colors are low and high velocity regions presented as percent perturbation from the background one-dimensional models. Small circles are projected seismicity. A line drawing of the proposed magma system below Rainier's edifice is an interpretation based on tomographic analysis and similarity with Mount St. Helens inversion. C) Mount St. Helens cross section. Color codes as in B. Focal mechanisms are front projections of seismicity, primarily located in the stoping region, color coded according to rake. Line drawing is an interpretation of the plumbing system of Mount St. Helens based primarily on seismicity and geochemical analysis (Pallister, et al., 1992)