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September 20, 2014

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A seismic monitor measures the vertical and horizontal movement of the ground surrounding a prototype "passive seismic" sensor that will be arrayed around Mount St. Helens as part of a battery of multidisciplinary imaging experiments collectively called iMUSH for Imaging Magma Under St. Helens.

Dean J. Koepfler / Tacoma News Tribune/MCT

A seismic monitor measures the vertical and horizontal movement of the ground surrounding a prototype "passive seismic" sensor that will be arrayed around Mount St. Helens as part of a battery of multidisciplinary imaging experiments collectively called iMUSH for Imaging Magma Under St. Helens.