Mount Hood

Mount Hood is a potentially active volcano, and the highest peak in Oregon State. It is located approximately 75 km ESE of Portland, OR.

In the last 1,500 years, Mount Hood has had two major eruptive periods that produced lava domes, pyroclastic flows and mud flows, and minor ash fallout. The most recent major eruptive period began in 1780 and lasted for one to two decades. Minor eruptive activity was observed during the mid-19th century. Rapid melting of snow and glacier ice by pyroclastic flows can generate large lahars that race down river valleys.

More information about Mount Hood

Background Seismicity

The Cascades Volcano Observatory and the PNSN cooperatively operate 6 seismometers on or near Mount Hood. On average, we locate 0 to 3 earthquakes within 10 km of the volcano each week.