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San Juan

Photo of this volcano
  • Mexico
  • México and Central America
  • Stratovolcano(es)
  • Pleistocene
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 21.47°N
  • 104.97°W

  • 2240 m
    7349 ft

  • 341810
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for San Juan.

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

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

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

Emission History

There is no Emissions History data available for San Juan.

Photo Gallery

The locally widespread Tepic Pumice is exposed in this quarry on the NW outskirts of the city of Tepic. The zoned rhyodacitic-andesitic pumice, forming the upper half of this exposure, was erupted about 15,000 years ago and resulted in the formation of a 4-km-wide caldera at the summit of San Juan volcano. The 5.6 cu km Tepic Pumice deposit underlies the city of Tepic, the captial city of Narayit state, to thickness of 2-9 m.

Photo by Jim Luhr, 1976 (Smithsonian Institution).
Following the eruption of the Tepic Pumice and the formation of an elongated caldera at the summit of San Juan volcano, a lava dome was constructed within the caldera. The dome forms the rounded forested area in front of the western caldera rim, which marks the horizon. The caldera is 4 km wide in the E-W direction of this photo and 1 km wide in a N-S direction. Andesitic lava flows (left center) erupted from the dome and flowed across the caldera floor to its eastern side.

Photo by Jim Luhr, 1979 (Smithsonian Institution).
Volcán San Juan, the NW-most major volcano of the Mexican Volcanic Belt, displays an irregular profile west of the city of Tepic. The northern wall of a 1 x 4 km wide, oval-shaped caldera that was created about 15,000 years ago forms the right-hand horizon. The rounded notched peak on the center horizon is an intracaldera lava dome that was constructed shortly thereafter. The flanks of Cerro Alto stratovolcano, the 2240 m high point of the San Juan volcanic complex, can be seen at the extreme left.

Photo by Jim Luhr, 1976 (Smithsonian Institution).
A composite aerial photo with north to the top shows the lighter-gray summit of San Juan volcano just left of the center of the photo. Cerro Alto, the highest peak of the San Juan complex, forms the dark area at the lower left. A dark shadow highlights a 5-km-long NE-trending ridge that marks an eruptive fissure of the cone-building stage of San Juan. Prominent leveed lava flows that reach the northern flank mark the latest eruptive products of San Juan. The cities of Tepic and Jalisco lie at the upper and lower right, respectively.

Photo courtesy of Jim Luhr (Smithsonian Institution).
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: Puerto Vallarta
Publisher: INEGI
Country: Mexico
Year: 1998
Map Type: Topographic
Scale: 1:250,000
Map of Puerto Vallarta

Title: Tequila
Publisher: INEGI
Country: Mexico
Year: 1998
Map Type: Topographic
Scale: 1:50,000
Map of Tequila

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: Mexico
Publisher: DMA Aerospace Center
Country: Mexico
Year: 1985
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of Mexico

Title: Guadalajara
Publisher: INEGI
Country: Mexico
Year: 1985
Map Type: Topographic
Scale: 1:250,000
Map of Guadalajara

Title: Aguascalientes
Publisher: SPP
Country: Mexico
Year: 1982
Map Type: Geology
Scale: 1:250,000
Map of Aguascalientes

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

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

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

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

Title: Tepic
Publisher: INEGI
Country: Mexico
Year: 1980
Map Type: Topographic
Scale: 1:250,000
Map of Tepic

Title: El Salvador
Publisher: SPP CGSNI
Country: Mexico
Year: 1979
Map Type: Geology
Scale: 1:50,000
Map of El Salvador

Title: Etzatlan
Publisher: Comision de Estudios del Territorio Nacional
Country: Mexico
Year: 1974
Map Type: Geology
Scale: 1:50,000
Map of Etzatlan

Title: Hostotipaquillo
Publisher: Comision de Estudios del Territorio Nacional
Country: Mexico
Year: 1973
Map Type: Geology
Scale: 1:50,000
Map of Hostotipaquillo
Smithsonian Sample Collections Database

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

External Sites