- Info & Contacts
The Global Volcanism Program has no activity reports for Segula.
The Global Volcanism Program has no Weekly Reports available for Segula.
The Global Volcanism Program has no Bulletin Reports available for Segula.
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.
The Global Volcanism Program is not aware of any Holocene eruptions from Segula. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Segula 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 Segula.
There is no Emissions History data available for Segula.
|A prominent N-S-trending fissure that extends to sea level at both ends cuts across Segula volcano, located near the western end of the Aleutian arc. The irregular topography on the north side of the island is formed by an extensive lava field that was erupted from the summit crater and blankets the NE flank of the volcano to the coast. A smaller lava field at the lower right originated from a cinder cone on the lower SE flank. A cinder cone constructed along the south rim of a small caldera forms the 1153 m high point of the island.
Photo by U.S. Air Force (published in U.S. Geological Survey Bulletin 1028-K).
|The view WNW from the western side of Little Sitkin Island includes the broad snow-free island of Davidof, part of the rim of a largely submerged caldera, across the right center. The snow-capped peak behind Davidof is historically active Segula volcano. In the background at far left is the snow-capped Kiska volcano.
Photo by Steve Ebbert, 2000 (U.S. Fish and Wildlife Service).
|The 6 x 7 km island of Segula is seen offshore from the SW. The conical stratovolcano cut by a prominent NNW-SSE-trending fissure that extends to sea level at both ends of the island. The summit of Segula contains a small, poorly defined caldera that is partly overtopped on the south by a cinder cone that forms the 1153 m high point of the island. No historical eruptions are known from Segula, but fresh-looking lava flows are found on the north flank.
Photo by Christina Neal, 2005 (Alaska Volcano Observatory, U.S. Geological Survey).
The following 44 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.
|Catalog Number||Sample Description||Lava Source||Collection Date|
|NMNH 118207-1||Breccia||--||8 Sep 2015|
|NMNH 118207-10||Volcanic Ash||--||8 Sep 2015|
|NMNH 118207-11||Basaltic andesite scoria||--||8 Sep 2015|
|NMNH 118207-12||Andesite debris flow||--||8 Sep 2015|
|NMNH 118207-13||Basaltic andesite lapilli tephra||--||8 Sep 2015|
|NMNH 118207-14||Debris flow||--||8 Sep 2015|
|NMNH 118207-15||Debris flow||--||8 Sep 2015|
|NMNH 118207-16||Debris flow||--||9 Sep 2015|
|NMNH 118207-17||Soil||--||9 Sep 2015|
|NMNH 118207-18||Debris flow||--||9 Sep 2015|
|NMNH 118207-19||Soil||--||9 Sep 2015|
|NMNH 118207-2||Breccia||--||8 Sep 2015|
|NMNH 118207-20||Debris flow||--||9 Sep 2015|
|NMNH 118207-21||Scoria||--||11 Sep 2015|
|NMNH 118207-22||Basalt||--||11 Sep 2015|
|NMNH 118207-23||Scoria||--||11 Sep 2015|
|NMNH 118207-24||Andesite debris flow||--||11 Sep 2015|
|NMNH 118207-25||Debris flow||--||11 Sep 2015|
|NMNH 118207-26||Basalt||--||11 Sep 2015|
|NMNH 118207-27||Basalt||--||11 Sep 2015|
|NMNH 118207-28||Basalt||--||11 Sep 2015|
|NMNH 118207-29||Basalt||--||11 Sep 2015|
|NMNH 118207-3||Andesite||--||8 Sep 2015|
|NMNH 118207-30||Basaltic Andesite||--||11 Sep 2015|
|NMNH 118207-31||Basalt||--||11 Sep 2015|
|NMNH 118207-32||Basaltic Andesite||--||11 Sep 2015|
|NMNH 118207-33||Volcanic Breccia||--||11 Sep 2015|
|NMNH 118207-34||Lapilli tephra||--||11 Sep 2015|
|NMNH 118207-35||Basaltic Andesite||--||8 Sep 2015|
|NMNH 118207-36||Basalt||--||8 Sep 2015|
|NMNH 118207-37||Andesite||--||8 Sep 2015|
|NMNH 118207-38||Basalt||--||8 Sep 2015|
|NMNH 118207-39||Andesite||--||8 Sep 2015|
|NMNH 118207-4||Soil||--||8 Sep 2015|
|NMNH 118207-40||Basalt||--||8 Sep 2015|
|NMNH 118207-41||Dacite debris flow||--||9 Sep 2015|
|NMNH 118207-42||Dacite debris flow||--||9 Sep 2015|
|NMNH 118207-43||Andesite debris flow||--||9 Sep 2015|
|NMNH 118207-44||Basaltic Andesite||--||11 Sep 2015|
|NMNH 118207-5||Lapilli tephra||--||8 Sep 2015|
|NMNH 118207-6||Debris flow||--||8 Sep 2015|
|NMNH 118207-7||Debris flow||--||8 Sep 2015|
|NMNH 118207-8||Basalt lapilli tephra||--||8 Sep 2015|
|NMNH 118207-9||Basaltic andesite lapilli tephra||--||8 Sep 2015|
|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 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.|
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.|
|Large Eruptions of Segula||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).|
|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.|
|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).|