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La Reforma

Photo of this volcano
  • Mexico
  • México and Central America
  • Caldera
  • Pleistocene
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 27.508°N
  • 112.392°W

  • 1300 m
    4265 ft

  • 341803
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for La Reforma.

The Global Volcanism Program has no Weekly Reports available for La Reforma.

The Global Volcanism Program has no Bulletin Reports available for La Reforma.

The Global Volcanism Program has no synonyms or subfeatures listed for La Reforma.

Eruptive History

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

Emission History

There is no Emissions History data available for La Reforma.

Photo Gallery

The early Pleistocene La Reforma caldera lies NW of the town of Santa Rosita (left) on the Gulf of California. The roughly 10-km-wide caldera contains a central dome (center horizon) made of resurgent basement rocks. Ignimbrite outflow sheets form flat surfaces and scarps. The age of the caldera was determined by the K-Ar method to be between 1.6 and 1.4 Ma. The eruption of andesitic and dacitic ring-fracture lava domes followed. Andesitic lava flows were erupted on the flanks of the caldera both before and after caldera formation.

Photo by José Macías, 1995 (Universidad Nacional Autónoma de México).
See title for photo information.
Post-caldera resurgent blocks of the early Pleistocene La Reforma caldera rise to the north above the Gulf of California. The roughly 10-km-wide caldera contains a 1300-m-high central dome (left-center horizon) made of resurgent basement rocks. Ignimbrite outflow sheets form flat surfaces and scarps, and uplifted marine terraces are prominent along the coast.

Photo by Brian Hausback, 1994 (California State University, Sacramento).
See title for photo information.
Three major Quaternary volcanic complexes are visible in this Landsat satellite image of Baja California. The N-S-trending Las Vírgenes volcanic complex at the left center consists of three southward-younging stratovolcanoes. The dramatic 10-km-wide La Reforma caldera along the Gulf of California coast at the upper right displays dark-colored andesitic outer flanks and a resurgent dome in the center of the caldera. The extensively eroded El Aguajito caldera lies north of Tres Vírgenes and NW of La Reforma and has indistinct margins.

NASA Landsat image (processed by Brian Hausback, UC Sacramento).
See title for photo information.
The summit crater of La Vírgen parasitic cinder cone on the east flank of La Reforma caldera is seen from its north rim. The SE rim of 10-km-wide La Reforma caldera forms the ridge on the horizon with the Gulf of California on the left.

Photo by Keith Sutter, 2000.
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: San Isidro
Publisher: INEGI
Country: Mexico
Year: 1998
Map Type: Topographic
Scale: 1:250,000
Map of San Isidro

Title: Loreto
Publisher: INEGI
Country: Mexico
Year: 1998
Map Type: Topographic
Scale: 1:250,000
Map of Loreto

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, United States
Publisher: DMA Aerospace Center
Country: Mexico, US- AZ
Year: 1986
Series: ONC
Map Type: Topographic
Scale: 1:1,000,000
Map of Mexico, United States

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

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

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

Title: Santa Rosalia
Publisher: SPP
Country: Mexico
Year: 1980
Map Type: Topographic
Scale: 1:250,000
Map of Santa Rosalia

Title: Guaymas
Publisher: SPP
Country: Mexico
Year: 1980
Map Type: Topographic
Scale: 1:250,000
Map of Guaymas
Smithsonian Sample Collections Database

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

External Sites