Global Volcanism Program

The Global Volcanism Program has no activity reports available for Silverthrone.

The Global Volcanism Program has no Weekly Reports available for Silverthrone.

The Global Volcanism Program has no Bulletin Reports available for Silverthrone.

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude

320160

Unknown - Evidence Credible

2,860 m / 9,383 ft

51.5179°N
126.1133°W

Morphology

Volcano Landform
Composite

Volcano Types
Caldera
Lava dome(s)
Pyroclastic cone(s)

Rock Types

Major
Andesite / Basaltic Andesite
Rhyolite
Dacite

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km

7
7
67
1,278

Geological Summary

The Silverthrone volcanic complex lies near the coast in SW British Columbia, 55 km N of Kingcome Inlet and 60 km NW of Knight Inlet. The roughly circular, 20-km-wide, deeply dissected caldera complex contains rhyolitic, dacitic and andesitic lava domes, lava flows, and breccia. The bulk of the complex appears to have been erupted between 100,000 and 500,000 years ago, but postglacial andesitic and basaltic-andesite cones and lava flows are also present. Anomalously old Potassium-Argon (K-Ar) dates of 1.0 and 1.1 Ma were obtained from a lava flow in the postglacial Pashleth and Machmel Creek valleys (Green et al., 1988). This flow is clearly much younger than the K-Ar date, and high-energy glacial streams have only begun to etch a channel along the margin. A radiocarbon date from barnacles 8.5 km upstream from the mouth of Machmel River, and buried by the flow, yielded an age of 12,200 ± 140 years (Blake, 1985). This is a maximum age for the flow, which could be much younger (Hickson and Edwards, 2001).

References

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Blake W, 1985. Geological Survey of Canada radiocarbon dates XXV. Geol Surv Can Pap, 85: 19.

Green N L, Armstrong R L, Harakal J E, Souther J G, Read P B, 1988. Eruptive history and K-Ar geochronology of the late Cenozoic Garibaldi volcanic belt, southwestern British Columbia. Geol Soc Amer Bull, 100: 563-579.

Hickson C J, Edwards B R, 2001. Volcanoes and Volcanic Hazards in Canada. In; Brooks G R (ed) A Synthesis of Geological Hazards in Canada, Geol Surv Can Bull, 548: 1-248.

Hickson C J, Soos A, Wright R, 1994. Catalogue of Canadian volcanoes. Geol Surv Canada Open-File Rpt.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior.

Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.

Eruptive History

The Global Volcanism Program is not aware of any Holocene eruptions from Silverthrone. If this volcano has had large eruptions (VEI >= 4) prior to 12,000 years ago, information might be found on the Silverthrone 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.

Cones

Feature Name

Feature Type

Elevation

Latitude

Longitude

Machmel River

Cone

1800 m

51° 31' 0.00" N

126° 13' 0.00" W

Photo Gallery

Silverthrone volcano in SW British Columbia, Canada, is below the glaciers in the center of this September 2018 Planet Labs satellite image monthly mosaic (N is at the top; this image is approximately 150 km across). It is a roughly 20-km-wide eroded caldera complex containing lava domes and flows.

Satellite image courtesy of Planet Labs Inc., 2018 (https://www.planet.com/).

Smithsonian Sample Collections Database

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

External Sites

Copernicus Browser

The Copernicus Browser replaced the Sentinel Hub Playground browser in 2023, to provide access to Earth observation archives from the Copernicus Data Space Ecosystem, the main distribution platform for data from the EU Copernicus missions.

MIROVA

Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.

MODVOLC Thermal Alerts

Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.

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.

Volcanic Hazard Maps

The IAVCEI Commission on Volcanic Hazards and Risk has a Volcanic Hazard Maps database designed to serve as a resource for hazard mappers (or other interested parties) to explore how common issues in hazard map development have been addressed at different volcanoes, in different countries, for different hazards, and for different intended audiences. In addition to the comprehensive, searchable Volcanic Hazard Maps Database, this website contains information about diversity of volcanic hazard maps, illustrated using examples from the database. This site is for educational purposes related to volcanic hazard maps. Hazard maps found on this website should not be used for emergency purposes. For the most recent, official hazard map for a particular volcano, please seek out the proper institutional authorities on the matter.

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 Silverthrone. 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 Silverthrone. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player.

DECADE Data

The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the Mapping Gas Emissions (MaGa) Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO₂ to the atmosphere, but installing CO₂ monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere.

Large Eruptions of Silverthrone

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).