Isla San Luis

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 29.97°N
  • 114.4°W

  • 180 m
    590 ft

  • 341003
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Isla San Luis.

The Global Volcanism Program has no Weekly Reports available for Isla San Luis.

The Global Volcanism Program has no Bulletin Reports available for Isla San Luis.

The Global Volcanism Program is not aware of any Holocene eruptions from Isla San Luis. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Isla San Luis page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Photo Gallery


Isla San Luis, viewed here from the SW with a large rhyolitic lava dome at the left center, is the largest of the seven Encantada islands in the northern part of the Gulf of California. The roughly 180-m-high island lies 3 km off the eastern shore of Baja California. An older lava dome forms the NE tip of the island, and a dissected tuff ring lies at the SE tip. The lava dome seen here in the center of the island was constructed within a tuff cone and is the youngest volcanic product of Isla San Luis.

Photo by Brian Hausback, 1997 (California State University, Sacramento).
See title for photo information.
Isla San Luis is seen here from the south with a 2-km-long spit (at low tide) at the lower left. Three major vents, a rhyolitic lava dome forming the NW tip of the island, the central rhyolitic obsidian dome, and a dissected dacitic tuff ring at the SE tip of the island, were erupted along a trend parallel to a transform fault in the Gulf of California. Another tuff ring, Isla Poma, lies 1 km NE of Isla San Luis and is visible at the upper right.

Photo by Brian Hausback, 2000 (California State University, Sacramento).
See title for photo information.
Isla San Luis lies across a narrow channel from the NE coast of Baja California (visible in the background). The center of the small island is dominated by a dramatic dark-colored rhyolitic obsidian dome. An older dome, partially mantled by ash and pumice from the central dome, forms the northern part of the island (foreground). A dissected tuff ring, Plaza de Toros, occupies the SE end of the island. A sequence of rocks ranging from initial basaltic-andesite and andesitic palagonite tuffs to rhyolitic lava domes was erupted during a short time interval.

Photo by Keith Sutter, 2000.
See title for photo information.
The Plaza de Toros tuff ring on the SE side of Isla San Luis, seen here from the east, has been partially dissected by wave erosion. Remnants of dacitic lava flows are visible in the upper walls of the crater. Only a third of the tuff ring is still standing; the remainder subsided along normal faults or was removed by wave erosion. Longshore currents have redistributed friable volcanic ejecta from the cone to produce the dramatic tombolo at the upper right that forms the SW tip of the island and is 2 km long at low tide.

Photo by Keith Sutter, 2000.
See title for photo information.
A dramatic youthful obsidian dome occupies the center of Isla San Luis off the NE coast of Baja California. The dome was constructed within a tuff cone whose rim is visible immediately in front of the dome. As growth of the dome continued in the central vent (left foreground), a thick coulee advanced to the south and overflowed the SE rim of the tuff cone, forming the broad lobe behind it. The age of the extremely youthful rhyolitic dome is not known. The dissected Plaza de Toros tuff ring in the left background forms the SE tip of the island.

Photo by Keith Sutter, 2000.
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Isla San Luis in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites