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.
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| Feature Name | Feature Type | Elevation | Latitude | Longitude |
| Alto, Cerro | Stratovolcano | 2240 m | 21° 27' 0" N | 104° 58' 30" W |
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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).
There is no Deformation History data available for San Juan.
There is no Emissions History data available for San Juan.
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. 
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.
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.
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.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.
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Title: Puerto Vallarta Publisher: INEGI Country: Mexico Year: 1998 Map Type: Topographic Scale: 1:250,000 |
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Title: Tequila Publisher: INEGI Country: Mexico Year: 1998 Map Type: Topographic Scale: 1:50,000 |
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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 |
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Title: Mexico Publisher: DMA Aerospace Center Country: Mexico Year: 1985 Series: ONC Map Type: Topographic Scale: 1:1,000,000 |
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Title: Guadalajara Publisher: INEGI Country: Mexico Year: 1985 Map Type: Topographic Scale: 1:250,000 |
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Title: Aguascalientes Publisher: SPP Country: Mexico Year: 1982 Map Type: Geology Scale: 1:250,000 |
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Title: Estado de Sinaloa Publisher: USGS /SAHOP Country: Mexico Year: 1982 Series: SAHOP Landsat Map Type: Satellite Scale: 1:1,000,000 |
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Title: Estado de Durango Publisher: USGS /SAHOP Country: Mexico Year: 1982 Series: SAHOP Landsat Map Type: Satellite Scale: 1:1,000,000 |
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Title: Estado de Nayarit Publisher: USGS /SAHOP Country: Mexico Year: 1982 Series: SAHOP Landsat Map Type: Satellite Scale: 1:500,000 |
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Title: Estado de Jalisco Publisher: USGS /SAHOP Country: Mexico Year: 1982 Series: SAHOP Landsat Map Type: Satellite Scale: 1:500,000 |
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Title: Tepic Publisher: INEGI Country: Mexico Year: 1980 Map Type: Topographic Scale: 1:250,000 |
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Title: El Salvador Publisher: SPP CGSNI Country: Mexico Year: 1979 Map Type: Geology Scale: 1:50,000 |
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Title: Etzatlan Publisher: Comision de Estudios del Territorio Nacional Country: Mexico Year: 1974 Map Type: Geology Scale: 1:50,000 |
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Title: Hostotipaquillo Publisher: Comision de Estudios del Territorio Nacional Country: Mexico Year: 1973 Map Type: Geology Scale: 1:50,000 |
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There are no samples for San Juan in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.
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WOVOdat
Single Volcano View Temporal Evolution of Unrest Side by Side Volcanoes |
WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
GVMID Data on Volcano Monitoring Infrastructure The Global Volcano Monitoring Infrastructure Database GVMID, is aimed at documenting and improving capabilities of volcano monitoring from the ground and space. GVMID should provide a snapshot and baseline view of the techniques and instrumentation that are in place at various volcanoes, which can be use by volcano observatories as reference to setup new monitoring system or improving networks at a specific volcano. These data will allow identification of what monitoring gaps exist, which can be then targeted by remote sensing infrastructure and future instrument deployments. |
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Sentinel Hub Playground
Sentinel Hub EO Browser |
The Sentinel Hub Playground provides a quick look at any Sentinel-2 image in any combination of the bands and enhanced with image effects; Landsat 8, DEM and MODIS are also available. Sentinel Hub is an engine for processing of petabytes of satellite data. It is opening the doors for machine learning and helping hundreds of application developers worldwide. It makes Sentinel, Landsat, and other Earth observation imagery easily accessible for browsing, visualization and analysis. Sentinel Hub is operated by Sinergise |
| IRIS seismic stations/networks | Incorporated Research Institutions for Seismology (IRIS) Data Services map showing the location of seismic stations from all available networks (permanent or temporary) within a radius of 0.18° (about 20 km at mid-latitudes) from the given location of San Juan. Users can customize a variety of filters and options in the left panel. Note that if there are no stations are known the map will default to show the entire world with a "No data matched request" error notice. |
| UNAVCO GPS/GNSS stations | Geodetic Data Services map from UNAVCO showing the location of GPS/GNSS stations from all available networks (permanent or temporary) within a radius of 20 km from the given location of San Juan. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player. |
| Large Eruptions of San Juan | Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA). |
| EarthChem | EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS). |
