Haleakala, rising more than 10,000 feet from sea level, erupts every 200 to 500 years, according to the USGS Hawaiian Volcano Observatory. The last lava flow between 1420 and 1620 created the ...

Protesters tried to block the construction of a new observatory on Haleakala in 2017 but building went ahead and the Daniel K. Inouye Solar Telescope released its first images in 2020.