
Seismic swarm on submarine flank
Since June 1998, increasing seismic activity in the vicinity of Sete Cidades volcano has resulted in occasional seismic swarms. On the night of 2-3 August about 120 events were registered in 3 hours. During that period, five earthquakes were felt along the W coast, the strongest with a magnitude of 3.1 reached a maximum intensity of V (MM) at Ginetes e Varzea. Similarly, on 2 September in Sao Miguel more than 120 events occurred beneath the sea floor over a period of about 4 hours near shore between Ponta da Ferraria and Mosteiros. One of the five felt earthquakes during this period also reached an intensity of V (MM). There were no reports of injury or damage from any of these events.
Information Contacts: João Luis Gaspar and Nicolau Wallenstein, Departamento de Geociencias, Centro de Vulcanologia, Universidade dos Açores, Rua Mae de Deus, 9500 - Ponta Delgada, Sao Miguel, Açores, Portugal.
The Global Volcanism Program has no Weekly Reports available for Sete Cidades.
Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.
Seismic swarm on submarine flank
Since June 1998, increasing seismic activity in the vicinity of Sete Cidades volcano has resulted in occasional seismic swarms. On the night of 2-3 August about 120 events were registered in 3 hours. During that period, five earthquakes were felt along the W coast, the strongest with a magnitude of 3.1 reached a maximum intensity of V (MM) at Ginetes e Varzea. Similarly, on 2 September in Sao Miguel more than 120 events occurred beneath the sea floor over a period of about 4 hours near shore between Ponta da Ferraria and Mosteiros. One of the five felt earthquakes during this period also reached an intensity of V (MM). There were no reports of injury or damage from any of these events.
Information Contacts: João Luis Gaspar and Nicolau Wallenstein, Departamento de Geociencias, Centro de Vulcanologia, Universidade dos Açores, Rua Mae de Deus, 9500 - Ponta Delgada, Sao Miguel, Açores, Portugal.
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 |
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Feature Name | Feature Type | Elevation | Latitude | Longitude |
Alferes, Caldeira do | Cone | 450 m | 37° 52' 0" N | 25° 48' 0" W |
Boi, Pico do | Cone | 542 m | 37° 49' 0" N | 25° 43' 0" W |
Camarinhas, Pico das | Cone | 219 m | 37° 51' 0" N | 25° 51' 0" W |
Carvao | Cone | 815 m | 37° 49' 0" N | 25° 44' 0" W |
Cavalo, Pico do | Cone | 215 m | 37° 51' 0" N | 25° 51' 0" W |
Cedro, Pico do | Cone | 387 m | 37° 49' 0" N | 25° 42' 0" W |
Cruz, Pico da | Cone | 850 m | 37° 51' 0" N | 25° 46' 0" W |
Eguas | Cone | 873 m | 37° 50' 0" N | 25° 45' 0" W |
Enforcado, Pico do | Cone | 338 m | 37° 48' 0" N | 25° 41' 0" W |
Ferrarias | Cone | 37° 50' 0" N | 25° 46' 0" W | |
Ilheu Dos Mosteiros | Cone | 37° 55' 0" N | 25° 50' 0" W | |
Mafra, Pico de | Cone | 360 m | ||
Mulata | Cone | 373 m | 37° 48' 0" N | 25° 42' 0" W |
Pilar, Lagoa do | Cone | 332 m | 37° 54' 0" N | 25° 47' 0" W |
Seara Cerrado de Ladeira | Pyroclastic cone | 475 m | 37° 52' 0" N | 25° 48' 0" W |
Varzea, Pico do | Cone | 275 m | 37° 52' 0" N | 25° 50' 0" W |
Craters |
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Feature Name | Feature Type | Elevation | Latitude | Longitude |
Alferes, Caldeira do | Pumice ring | 583 m | 37° 52' 0" N | 25° 48' 0" W |
Canario, Lagoa do | Maar | 811 m | 37° 50' 0" N | 25° 46' 0" W |
Rasa, Lagoa | Pumice ring | 625 m | 37° 51' 0" N | 25° 46' 0" W |
Santiago, Lagoa de
Sao Tiago, Lagoa de |
Pumice ring | 616 m | 37° 51' 0" N | 25° 46' 0" W |
Scara | Pit crater | 37° 52' 0" N | 25° 48' 0" W | |
Seca, Caldeira | Pumice ring | 375 m | 37° 51' 0" N | 25° 48' 0" W |
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There is data available for 16 Holocene eruptive periods.
Start Date | Stop Date | Eruption Certainty | VEI | Evidence | Activity Area or Unit |
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1880 | Unknown | Confirmed | 0 | Unknown | Volcano Uncertain: submarine vent off Sao Miguel |
1861 | Unknown | Confirmed | 0 | Unknown | Volcano Uncertain: submarine vent off Sao Miguel |
1811 Jun 14 | 1811 Jun 22 | Confirmed | 3 | Historical Observations | Submarine vent west of Sete Cidades |
1811 Feb 1 | 1811 Feb 8 | Confirmed | 2 | Historical Observations | Submarine vent west of Sete Cidades |
1713 | Unknown | Confirmed | 2 | Historical Observations | West flank (Pico das Camarinhas) |
1682 Dec 13 | Unknown | Confirmed | 2 | Historical Observations | Submarine vent west of Sete Cidades |
1638 Jul 3 | 1638 Jul 28 | Confirmed | 2 | Historical Observations | Submarine vent west of Sete Cidades |
1444 (?) | Unknown | Confirmed | 4 | Historical Observations | SW side of caldera (Caldeira Seca) |
1110 ± 50 years | Unknown | Confirmed | 2 | Radiocarbon (uncorrected) | West flank (Ponta de Ferraria) |
0950 ± 100 years | Unknown | Confirmed | 2 | Radiocarbon (uncorrected) | SE flank (Ferraria) |
0670 ± 150 years | Unknown | Confirmed | 3 | Radiocarbon (uncorrected) | SE flank (Carvao) |
0380 ± 300 years | Unknown | Confirmed | 4 | Tephrochronology | SE caldera floor (Lagoa Rasa) |
0090 ± 100 years | Unknown | Confirmed | 4 | Radiocarbon (uncorrected) | SE caldera floor (Lagoa de Santiago) |
0750 BCE ± 300 years | Unknown | Confirmed | Radiocarbon (uncorrected) | SE flank (Eguas) | |
2050 BCE ± 1000 years | Unknown | Confirmed | Tephrochronology | Caldeira do Alfreres and NW flank | |
3050 BCE (?) | Unknown | Confirmed | 4 | Tephrochronology | Seara Cerrado da Ladeira |
There is no Deformation History data available for Sete Cidades.
There is no Emissions History data available for Sete Cidades.
There are no samples for Sete Cidades in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.
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. |
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. |
Large Eruptions of Sete Cidades | 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). |