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Global Volcanism Program | Image GVP-04154

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).

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).

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Las Pilas