Global Volcanism Program | Image GVP-03695
A 1941 aerial photo from the SW shows a dark lava dome that rose in the large, 450-m-wide crater created by the powerful explosive eruption of January 1913. In 1922 the crater floor had a depth of about 300 m and was covered by avalanche debris from the crater walls. In May 1930, the crater bottom lay about 150 below the crater rim, and when the crater was visited in January 1931, black lava lay only 50 m below the notch on the northern crater rim. Renewed dome growth in 1957 soon filled the crater, and by 1961 lava began spilling over the crater rim.
Photo courtesy Julian Flores (University of Guadalajara), 1941.