Scientists say that magma is slowing starting to build inside Washington’s Mount St. Helens.

However, the scientists say there is no indication of an impending eruption like the one that killed 57 people in 1980.

“The magma reservoir beneath Mount St. Helens has been slowly re-pressurizing since 2008,” the U.S. Geological Survey said in a Wednesday statement.  “It is likely the re-pressurization is caused by the arrival of a small amount of additional magma 2 to 5 miles beneath the surface.”

The USGS said they will be working this summer with the Pacific Northwest Seismic Network at the University of Washington to monitor ground deformation and seismic activity at the volcano.  They will also measure gases and gravity field which can monitor subsurface magma.