The U.S. Geological Survey said Friday they have discovered a swarm of small earthquakes underneath Mount St. Helens since March, which could mean it’s recharging with magma. The biggest eruption of Mount St. Helens occurred nearly 36 years ago in May of 1980. “As was observed at Mount St. Helens between 1987-2004, recharge can continue for many years beneath a volcano without an eruption.”According to the USGS, the quakes are volcano-tectonic – which are commonly seen in active magma systems. Stress pushes fluid through cracks, creating small quakes or tremors. The stress drives fluids through cracks, producing the small quakes.

Source: Fox News May 07, 2016 02:22 UTC