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Santo Tomás

Photo of this volcano
  • Guatemala
  • México and Central America
  • Stratovolcano(es)
  • Pleistocene
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 14.71°N
  • 91.479°W

  • 3542 m
    11621 ft

  • 342800
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

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

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

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

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. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Santo Tomás 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.

Emission History

There is no Emissions History data available for Santo Tomás.

Photo Gallery

Volcán Santo Tomás is a Pleistocene stratovolcano with a large erosional caldera breached to the south. The complex volcano is seen here from the summit of Santa María volcano to its NW. Several lava domes are located on the volcano's flanks. No Holocene eruptions are known, although solfatara fields are located 3 km north and NW of the 3542-m-high summit of Volcán Zunil (right), which is located at the southern end of the volcanic complex. The volcano pairs of Tolimán-Atitlán and Acatenango-Fuego appear in the distance.

Photo by Lee Siebert, 1993 (Smithsonian Institution).
See title for photo information.
Volcán Santo Tomás (also known as Pecul) is the sharp peak on the right-center horizon rising above the Pacific coastal plain. A winding ridge connects Santo Tomás to Volcán de Zunil, 4.5 km to the NE, a 3542-m-high stratovolcano that forms the topographic high point of the complex at the extreme right. No Holocene eruptions are known from Santo Tomás, although there are active solfatara fields. An eruption plume rises from Santiaguito lava dome on the flank of conical Santa María volcano, across the Río Samalá to the west.

Photo by Lee Siebert, 1988 (Smithsonian Institution).
See title for photo information.
Conical Volcán Atitlán rises 3500 m above the flat-lying Pacific coastal plain of Guatemala. Atitlán's twin volcano to the north, Tolimán, forms the shoulder to the right of the summit. The volcanic highlands of Guatemala are seen here from the SE with Volcán Santo Tomás (Pecul) on the far left horizon, 35 km to the NW of Atitlán volcano.

Photo by Lee Siebert, 1988 (Smithsonian Institution).
See title for photo information.
The forested Cerro Quemado lava dome (left), seen here from Siete Orejas volcano, is one of a series of dacitic and rhyolitic lava domes constructed along the margin of the Almolonga caldera. The central dome complex of Cerro Quemado was erupted during the Holocene from at least 8 vents arranged in a circular pattern. One of these flank vents forms the low rounded ridge below the center horizon. Santa María volcano lies just out of view to the right, and the western side of the Santo Tomás (Pecul) volcanic complex forms the horizon.

Photo by Bill Rose, 1975 (Michigan Technological University).
See title for photo information.
Volcán Santo Tomás (also known as Volcán Pecul) is a large eroded stratovolcano that rises here to the east across the valley of the Río Samalá from the Zunil geothermal site. A winding ridge connects Santo Tomás to Volcán de Zunil, 4.5 km to the NE, a 3542-m-high stratovolcano that forms the topographic high point of the complex. No Holocene eruptions are known from Santo Tomás, although solfatara fields are located on the NW flank and 3 km north along the ridge to Zunil.

Photo by Bill Rose, 1981 (Michigan Technological University).
See title for photo information.
This view looks to the south from near the summit of Volcán de Zunil towards Volcán Santo Tomás (Pecul). Solfatara fields are located along the ridge between Santo Tomás and Zunil. Volcán de Zunil is located on the SW rim of the 4-km-wide, 600-m-deep Tzanjuyub caldera, which is breached to the south by the Río Masa.

Photo by Bill Rose, 1977(Michigan Technological University).
See title for photo information.
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).
See title for photo information.
GVP Map Holdings

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. The maps database originated over 30 years ago, but was only recently updated and connected to our main database. We welcome users to tell us if they see incorrect information or other problems with the maps; please use the Contact GVP link at the bottom of the page to send us email.


Title: Guatemala
Publisher: Instituto Geografico Militar
Country: Guatemala
Year: 1993
Map Type: Geology
Scale: 1:250,000
Map of Guatemala

Title: Carta Geolica de la Republica Mexicana
Publisher: Recursos Minerales and Institute de Gelogia
Country: Mexico
Year: 1992
Map Type: Geology
Scale: 1:2,000,000
Map of Carta Geolica de la Republica Mexicana

Title: Bath of Gulf of Mexico & Caribbean Sea
Publisher: AAPG, Williams & Heintz Map Corp.
Country: US/ C.Am/ S.Am
Year: 1984
Map Type: Bathymetric
Scale: 1:3,289
Map of Bath of Gulf of Mexico & Caribbean Sea

Title: Belize, El Salvador, Guatemala, Honduras, Mexico
Publisher: DMA Aerospace Center
Country: NW C Am (GU ES HO)
Year: 1982
Series: TPC
Map Type: Topographic
Scale: 1:500,000
Map of Belize, El Salvador, Guatemala, Honduras, Mexico

Title: Estado de Chiapas
Publisher: USGS /SAHOP
Country: Mexico
Year: 1982
Series: SAHOP Landsat
Map Type: Satellite
Scale: 1:500,000
Map of Estado de Chiapas

Title: Santa Cruz del Quiche
Publisher: IGN
Country: Guatemala
Year: 1973
Map Type: Topographic
Scale: 1:50,000
Map of Santa Cruz del Quiche

Title: Zacualpa
Publisher: IGN
Country: Guatemala
Year: 1973
Map Type: Topographic
Scale: 1:50,000
Map of Zacualpa

Title: Mapa Hipsometrico de la Republica de Guatemala
Publisher: IGN
Country: Guatemala
Year: 1970
Map Type: Topographic
Scale: 1:500,000
Map of Mapa Hipsometrico de la Republica de Guatemala

Title: Chichicastenango
Publisher: DGC
Country: Guatemala
Year: 1962
Map Type: Topographic
Scale: 1:50,000
Map of Chichicastenango

Title: Joyabaj
Publisher: DGC
Country: Guatemala
Year: 1962
Map Type: Topographic
Scale: 1:50,000
Map of Joyabaj
Smithsonian Sample Collections Database

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

External Sites