The United States Geological Survey (USGS) had currently tracked US active volcanoes exhibiting eruptions risks, 'with elevated unrest above known background level', and posted Orange code and Watch alert for one volcano and a Yellow code and an Advisory alert for six others across the country. Meanwhile, the six includes the world's largest active volcano, Mauna Loa, and Kilauea (both on Hawaii's Big Island), Gareloi, Semisopochnoi, and Cleveland, with the heightened level of alert of Yellow/Advisory. Monitoring the Hawaii and Alaska Volcanoes
(Photo : Photo by Cedric Letsch on Unsplash) The USGS estimates around 169 active volcanoes in the US, most of them are in Alaska, a home to many volcanoes. Although there are over 130 volcanoes and active volcanic fields within the geologically young last 2 million years, 50 have been active since the mid 1700s, AVO found.