Global Volcanism Program | Image GVP-03701
Renewed growth of the lava dome in the summit crater began in 1957. By the time of this aerial photo from the NE in 1961, lava had spilled over a notch in the northern crater rim and produced the blocky lava flow seen here diagonally descending the northern flank to the lower right. By the end of 1962 the flow reached the caldera floor, 1 km from the summit.
Photo from Mooser and Maldonando-Koerdell 1961 (XIIIth General Assembly IUGG).