The southern side of Las Pilas volcano is cut by a prominent transverse fissure, seen steaming in this 1970 view from the SW. A small circular pit crater, El Oyo, is located above the fissure just below the crater rim. Aside from a possible eruption in the 16th century, the only historical eruptions of Las Pilas took place in the 1950s from a fissure that extended across the east side of the 700-m-wide summit crater and down the north flank.

Photo by Dick Stoiber, 1970 (Dartmouth College).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Las Pilas-El Hoyo Complex