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San Quintin Volcanic Field, Mexico
Isla San Martin, 6 km off the west coast of Baja California, is the westernmost volcano of the San Quintin volcanic field and the only one that is located offshore.
The 2-km-wide island is a small basaltic shield volcano that is capped by scoria cones that rise to 230 m above sea level.
Wave erosion has truncated part of the shield volcano, forming the sea cliffs seen at the left on the south side of the island.
PHOTO SOURCE: Kim Luhr 1990, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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