In 2014, scientists set off 23 explosions and deployed 3,500 seismographs around Mount St Helens; the experiment helped image a magma reservoir roughly 4 to 15 km beneath the volcano

In 2014, scientists set off 23 explosions and deployed 3,500 seismographs around Mount St Helens; the experiment helped image a magma…

Mount St. Helens is one of the most closely studied volcanoes in the United States, but scientists still cannot directly see the complex system of magma and rock hidden beneath it.

In 2014, scientists blasted Mount St. Helens, one of America's most closely watched volcanoes, with 23 explosions, revealing a vast magma…