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Santo Tomás-Zunil

Photo of this volcano
  • Guatemala
  • Central America Volcanic Arc
  • Composite | Stratovolcano(es)
  • Pleistocene
  • Country
  • Volcanic Province
  • Landform | Volc Type
  • Last Known Eruption
  • 14.71°N
  • 91.479°W

  • 3,542 m
    11,621 ft

  • 342800
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports available for Santo Tomás-Zunil.

The Global Volcanism Program has no Weekly Reports available for Santo Tomás-Zunil.

The Global Volcanism Program has no Bulletin Reports available for Santo Tomás-Zunil.

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.

Eruptive History

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

Deformation History

There is no Deformation History data available for Santo Tomás-Zunil.

Emission History

There is no Emissions History data available for Santo Tomás-Zunil.

Photo Gallery

Volcán Santo Tomás is a Pleistocene stratovolcano, seen here from the summit of Santa María volcano to its NW. Geothermal activity occurs 3 km N and NW of the Volcán Zunil summit (right), which is located at the southern end of the volcanic complex. The Tolimán-Atitlán and Acatenango-Fuego complexes appear in the distance.

Photo by Lee Siebert, 1993 (Smithsonian Institution).
A plume rises from a Santiaguito lava dome on the flank of Santa María. Volcán Santo Tomás is the peak further to the right. A winding ridge connects Santo Tomás to Volcán de Zunil, 4.5 km to the NE, the peak at the far right.

Photo by Lee Siebert, 1988 (Smithsonian Institution).
Volcán Atitlán rises above the Pacific coastal plain of Guatemala. Tolimán is the lower peak to the right of the summit. The volcanic highlands of Guatemala are seen here from the SE with Volcán Santo Tomás on the far left, 35 km to the NW of Atitlán.

Photo by Lee Siebert, 1988 (Smithsonian Institution).
The Cerro Quemado lava dome (left), seen here from Siete Orejas volcano, is one of a series of lava domes along the margin of the Almolonga caldera. The Cerro Quemado dome complex formed during the Holocene from eruptions along at least eight vents. One of these domes forms the low rounded feature below the center horizon. Santa María lies just out of view to the right, and the western side of the Santo Tomás volcanic complex forms the horizon.

Photo by Bill Rose, 1975 (Michigan Technological University).
Volcán Santo Tomás is a large eroded stratovolcano seen here to the east across the valley of the Río Samalá from the Zunil geothermal site. The summit of Volcán de Zunil is 4.5 km to the NE. Geothermal fields are located on the NW Santo Tomás flank and 3 km north along the ridge to the Zunil summit.

Photo by Bill Rose, 1981 (Michigan Technological University).
This view looks to the south from near the summit of Volcán de Zunil towards Volcán Santo Tomás. Geothermal fields are located along the ridge between Santo Tomás and Zunil.

Photo by Bill Rose, 1977(Michigan Technological University).
The light-colored, furrowed area at the top-center is the 4-km-wide, 600-m-deep Tzanjuyub caldera, which is breached to the south by the Río Masa. At the SW side of the Pleistocene caldera is Volcán Zunil, which is connected by an irregular ridge to Volcán Santo Tomás, a large eroded stratovolcano above the clouds at the bottom of the image. Santa María volcano (far left-center) lies across the Río Samalá to the east. Solfataras and thermal springs are located on the west side of the ridge between Santo Tomás and Zunil.

NASA Landsat image, 2000 (courtesy of Loren Siebert, University of Akron).
GVP Map Holdings

Maps are not currently available due to technical issues.

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included.

Smithsonian Sample Collections Database

There are no samples for Santo Tomás-Zunil in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

External Sites