Global Volcanism Program | Image GVP-03743
A dark ash plume, seen here from the NE, rises above the new volcano on February 21, 1943, the 2nd day of the eruption. The new cone, seen just rising above the tree tops, is about 30 m high. During this early stage the cone had the shape of a low dome, with slope angles of 32 degrees toward the west, but lesser angles to the east. This indicates that the cone had already been breached and that lava had begun flowing to the east.
Photo by Salvador Ceja, 1943 (U.S. National Archives, published in Luhr and Simkin, 1993).