Stepovak Bay 4

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  • United States
  • Alaska
  • Stratovolcano
  • Unknown - Evidence Credible
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 55.954°N
  • 159.954°W

  • 1557 m
    5107 ft

  • 312053
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Stepovak Bay 4.

The Global Volcanism Program has no Weekly Reports available for Stepovak Bay 4.

The Global Volcanism Program has no Bulletin Reports available for Stepovak Bay 4.

Basic Data

Volcano Number

Last Known Eruption

Elevation

Latitude
Longitude
312053

Unknown - Evidence Credible

1557 m / 5107 ft

55.954°N
159.954°W

Volcano Types

Stratovolcano

Rock Types

Major
No Data (checked)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
0
0
12
1,248

Geological Summary

A group of four late-Pleistocene to Holocene volcanoes is located along a NE-trending line SW of Kupreanof volcano. The SW-most of the 4 volcanoes, located NW of Stepovak Bay and 24 km SW of Kupreanof, is of late-Pleistocene age. Stepovak Bay 4, located 5.5 km NE of Stepovak Bay 3 cinder cone and 9 km SW of Kupreanof volcano, is a small, 1557-m-high stratovolcano. Holocene debris flows or block-and-ash flows with possible juvenile material extend from Stepovak Bay 4 volcano, and a fumarole has been observed.

References

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

Alaska Volcano Observatory, 2005-. Volcanoes. http://www.avo.alaska.edu/volcanoes.php.

Wilson F H, 1989. Geologic setting, petrology, and age of Pliocene to Holocene volcanoes of the Stepovak Bay Area, Western Alaska Peninsula. U S Geol Surv Bull, 1903: 84-95.

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

Yount M E, Wilson F H, Miller J W, 1985. Newly discovered Holocene volcanic vents, Port Moller and Stepovak Bay quadrangles. In: Bartsch-Winkler S, Reed K M (eds), The United States Geological Survey in Alaska: Accomplishments in 1983, {U S Geol Surv Circ}, 945: 60-62.

The Global Volcanism Program is not aware of any Holocene eruptions from Stepovak Bay 4. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Stepovak Bay 4 page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

The Global Volcanism Program has no synonyms or subfeatures listed for Stepovak Bay 4.

Photo Gallery


A group of four small late-Pleistocene to Holocene volcanoes referred to as Stepovak Bay 1 through 4 lies along the NE-trending snow-covered ridge extending from the top center to the lower left. The chain of volcanoes lies NW of Stepovak Bay (lower right); individual centers are not distinguishable because of the extensive snow cover in this NASA Landsat image (with north to the top). The larger Kupreanof stratovolcano lies out of view at the upper right.

NASA Landsat7 image (worldwind.arc.nasa.gov).
A group of four small late-Pleistocene to Holocene volcanoes referred to as Stepovak Bay 1 through 4 lies along the NE-trending snow-covered ridge extending from the top center to the lower left. The chain of volcanoes lies NW of Stepovak Bay (lower right); individual centers are not distinguishable because of the extensive snow cover in this NASA Landsat image (with north to the top). The larger Kupreanof stratovolcano lies out of view at the upper right.

NASA Landsat7 image (worldwind.arc.nasa.gov).

Smithsonian Sample Collections Database


A listing of samples from the Smithsonian collections will be available soon.

Affiliated Sites

Large Eruptions of Stepovak Bay 4 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).
WOVOdat 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.
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).
MODVOLC - HIGP MODIS Thermal Alert System 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.
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.