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.
Kīlauea Volcano's summit vent "then and now." In April 2008, a month after it opened, the vent within Halema‘uma‘u Crater was about 115 feet in diameter (left). As of March 2013, it is more than 500 feet across (right). USGS photos.
