Mount Rainier Magma Mapping July 20, 2014 1:32 PMSubscribe
A team of geologists and geophysicists have imaged the path of a Pacific Northwest volcano's molten rock, from the subductingslab to the upper crust. The resulting magnetotelluric image shows a 2D side view of the Juan de Fuca plate (dark blue is the subducting plate, the red triangle up top is the volcano, and reddish-orange flowing up and being carried along with the plate is the molten rock. Red circles are small earthquakes.) The magma cross section was mapped using magnetotelluricimaging, a remote sensing technique that measures the conductivity and resistance in rock layers using the earth's electromagnetic field, and seismicreflection. The project was funded largely by Earthscope who also bring us USArray, a 15 year long travelling USA lithosphere mapping project.
A similar magma mapping is currently underway for another volcano in the Pacific Northwest Cascades, Mt. St. Helens.