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Global Volcanism Program | Image GVP-05830

The flat, grooved surface of this lava block was sandblasted by high-velocity pyroclastic surges during an eruption in 1775.  The pyroclastic surges accompanied formation of the 700-m-wide Tolire Jaha maar on the NW flank of Gamalama.   Photo by Jack Lockwood, 1980 (U.S. Geological Survey).

The flat, grooved surface of this lava block was sandblasted by high-velocity pyroclastic surges during an eruption in 1775. The pyroclastic surges accompanied formation of the 700-m-wide Tolire Jaha maar on the NW flank of Gamalama.

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


Gamalama