An official website of the United States government
Here's how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Many lava flows and one cinder cone erupted at several vents between 10,000 and about 2,000 years ago.
Many lava flows and one cinder cone erupted at several vents between 10,000 and about 2,000 years ago. Lava flows issued from vents near the summit and from flank vents as far as 9 km (5.6 mi) away, and individual flows are as long as 13 km (8 mi). Only about 33 percent of past lava flows reached more than 10 km (6.2 mi) from the summit and none reached as far as 20 km (12.4 mi). Future lava flows may affect low- and flat-lying ground about the same distance from the eruptive vent.
Many lava flows and one cinder cone erupted at several vents between 10,000 and about 2,000 years ago.
Many lava flows and one cinder cone erupted at several vents between 10,000 and about 2,000 years ago. Lava flows issued from vents near the summit and from flank vents as far as 9 km (5.6 mi) away, and individual flows are as long as 13 km (8 mi). Only about 33 percent of past lava flows reached more than 10 km (6.2 mi) from the summit and none reached as far as 20 km (12.4 mi). Future lava flows may affect low- and flat-lying ground about the same distance from the eruptive vent.