Lassen Volcanic National Park in northeastern California is home to one of the state's riskiest volcanoes, Lassen Peak. Lassen Peak is an active volcano that last erupted in 1915, and there is evidence to suggest that it is currently in a period of increased activity. In recent years, there have been increased reports of seismic activity and the emission of volcanic gases, including sulfur dioxide and carbon dioxide. In addition, there have been changes in the shape and size of the volcano's dome. These observations indicate that Lassen Peak is experiencing increased hydrothermal activity, which could potentially lead to an eruption.

Scientists at the United States Geological Survey (USGS) closely monitor Lassen Peak and the surrounding area for signs of increased volcanic activity. The USGS evaluates the volcano's seismic activity, gas emissions, and ground deformation to assess the risk of an eruption. If the USGS detects significant changes in these parameters, it may issue a warning to the public.

It is important to note that while Lassen Peak is considered a high-risk volcano, it is impossible to predict exactly when an eruption may occur. However, taking precautions and staying informed about the volcano's activity is essential for the safety of nearby communities and visitors to the area.