This classic breadcrust bomb was one of many large volcanic bombs ejected during the September 1980 eruption of Gamalama volcano. Ejected bombs and blocks covered a broad area up to about 1 km from the summit vent, primarily in northern and western directions. The largest ejected block was about 6 m in diameter. The western coast of Halmahera Island is visible in the distance.

Photo by Jack Lockwood, 1980 (U.S. Geological Survey).

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

Gamalama