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São Jorge

Photo of this volcano
  • Country
  • Primary Volcano Type
  • Last Known Eruption
  •  
  • 38.65°N
  • 28.08°W

  • 1053 m
    3455 ft

  • 382030
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number
Most Recent Weekly Report: 30 March-5 April 2022 Citation IconCite this Report

A seismic swarm beneath the W half of São Jorge began at 1605 on 19 March, with earthquakes along the Manadas volcanic fissure system between Velas (S side of the island) and Fajã do Ouvidor (N coast). On 31 March there were 714 seismic events detected, according to a preliminary analysis of seismic records. As the week progressed, the number of daily events fluctuated from 397 on 1 April to 592 on 5 April; magnitudes were relatively low. The Alert Level remained at V4 (on a scale of V0-V6).

Source: Centro de Informação e Vigilância Sismovulcânica dos Açores (CIVISA)

Weekly Reports - Index


2022: March


30 March-5 April 2022 Citation IconCite this Report

A seismic swarm beneath the W half of São Jorge began at 1605 on 19 March, with earthquakes along the Manadas volcanic fissure system between Velas (S side of the island) and Fajã do Ouvidor (N coast). On 31 March there were 714 seismic events detected, according to a preliminary analysis of seismic records. As the week progressed, the number of daily events fluctuated from 397 on 1 April to 592 on 5 April; magnitudes were relatively low. The Alert Level remained at V4 (on a scale of V0-V6).

Source: Centro de Informação e Vigilância Sismovulcânica dos Açores (CIVISA)


23 March-29 March 2022 Citation IconCite this Report

A seismic swarm beneath the W half of São Jorge began at 1605 on 19 March, with earthquakes along the Manadas volcanic fissure system between Velas (S side of the island) and Fajã do Ouvidor (N coast). CIVISA raised the Alert Level to V2 and then V3 (on a scale of V0-V6) during the morning of 20 March, and finally to V4 that afternoon. On 22 March Proteção Civil e Bombeiros dos Açores noted that, although no official evacuations had been issued, vulnerable people such as patients in the Velas health center were being moved to other locations on the island. Supplies were being distributed to São Jorge Island and residents were encouraged to prepare in case of a volcanic eruption. On 23 March a VONA was issued, announcing that the Aviation Color Code was raised to Yellow (on a four-color scale). The total estimated population of the island was around 8,400 people; according to a news report, about 1,250 residents left the island during 23-24 March. Most of the earthquakes were low magnitude, M 1.6-3.3, though about 209 of them were felt by residents; the largest event, a M 3.8, was detected near Velas at 2256 on 29 March. By 30 March a total of about 20,000 events had been recorded. Besides the increased seismicity, CIVISA noted that ground-based Global Navigation Satellite System (GNSS) data showed inflation, which was also suggested by satellite-based data processed by partners.

Sources: Portuguese American Journal; Centro de Informação e Vigilância Sismovulcânica dos Açores (CIVISA); Proteção Civil e Bombeiros dos Açores; U.S. News; Reuters; Açoriano Oriental; Açoriano Oriental


The Global Volcanism Program has no Bulletin Reports available for São Jorge.

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.

Eruptive History

There is data available for 13 Holocene eruptive periods.

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1964 Feb 18 1964 Feb 18 ] Uncertain   Submarine off SW coast
[ 1907 Unknown ] Discredited
1902 May 7 1902 May 8 Confirmed 0 Observations: Reported Submarine, ~27 km ESE of Ponta do Topo
1808 May 1 1808 Jun 10 Confirmed 1 Observations: Reported Sao Jorge
1800 Jun 24 1800 Jun 25 Confirmed 2 Observations: Reported Submarine, ~35 km SE of Ponta do Topo
[ 1757 Jul 9 1757 Jul 10 ] Discredited
1580 May 1 1580 Aug 30 (?) Confirmed 3 Observations: Reported Sao Jorge (SW side)
1483 Unknown Confirmed   Isotopic: 14C (calibrated) Sao Jorge
1426 Unknown Confirmed   Isotopic: 14C (calibrated) Sao Jorge
1293 Unknown Confirmed   Isotopic: 14C (calibrated) Sao Jorge
1282 Unknown Confirmed   Isotopic: 14C (calibrated) Sao Jorge
0412 Unknown Confirmed   Isotopic: 14C (calibrated) Sao Jorge
2137 BCE Unknown Confirmed   Isotopic: 14C (calibrated) Sao Jorge
Deformation History

There is no Deformation History data available for São Jorge.

Emission History

There is no Emissions History data available for São Jorge.

GVP Map Holdings

The Global Volcanism Program has no maps available for São Jorge.

Smithsonian Sample Collections Database

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

External Sites