Santo Tomas

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 14.71°N
  • 91.479°W

  • 3542 m
    11618 ft

  • 342800
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

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

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

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

The Global Volcanism Program is not aware of any Holocene eruptions from Santo Tomas. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Santo Tomas 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


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.

Smithsonian Sample Collections Database


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

Affiliated Sites