Although Mount St. Helens is expected to blow its top, perhaps in the near future, it is not as active as Kilauea Volcano, Mauna Loa Volcano, or Mount Cleveland, which are on a high state of alert and show signs of “persistent volcanic unrest”.

A March 20, 1980 earthquake heralded the May 18 eruption of Mount St. Helens that killed 57 people; destroyed and damaged property, roads, and railroads; and killed thousands of wild animals and millions of hatchery fish.

Sporadic activity continued through early 1991, with explosions, eruptions, and ash discharge. In late 2004, magma oozed out, creating a new "lava dome”. A “minor” eruption of steam and ash happened on March 8, 2005. The new dome continued to grow into 2006. Through 2006, pieces of the mountain crumbled, causing rockfalls, and steam and ash were released. In January, 2008, steam again seeped out.

Mount Cleveland, Alaska, in the Aleutian chain of islands, has been in volcanic unrest since 2015, with explosive eruptions or ash.

Hawaii’s Mauna Loa Volcano has been restless since 2014; since September 2015, it has been the focal point of earthquakes and ground-warping.

Kilauea Volcano, also on the main island of Hawaii, has erupted continuously since 1983, with lava flow making it dangerous to enter the ocean, and since 2008, a lava lake at the summit has produced explosions and gas and “vog” (eruptions of dangerous volcanic gas) that can affect the entire state.

More Info: volcanoes.usgs.gov