Eruptions of steam, ash, and tephra continued until June 1917, when the volcano resumed its quiet profile, with minor steam clouds occasionally reported. Since 1921, Lassen Peak has remained quiet.

Another claim to fame is that Lassen Peak is the largest plug dome ... apparently these conditions are late stage volcanic activity. Since the last eruptions in 1916, Lassen was designated a ...

Its namesake feature, the 10,457-foot Lassen Peak, is one of the world's largest ... Canyon State Park owes much of its existence to volcanic eruptions millions of years ago.

Tucked away in far northeastern California, Lassen offers sweeping ... The park is home to more than 40 volcanoes, bubbling mudpots, steaming fumaroles, stunning mountain views and vast, naturally ...

Tucked away in far northeastern California, Lassen offers sweeping ... The park is home to more than 40 volcanoes, bubbling mudpots, steaming fumaroles, stunning mountain views and vast, naturally ...