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Sao Jorge volcano (Azores) - Smithsonian / USGS Weekly Volcanic Activity Report for 23 March-29 March 2022 (New Activity / Unrest)

Wed, 30 Mar 2022, 19:54
19:54 PM | BY: VN
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
From: Global Volcanism Program, 2022. Report on Sao Jorge. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 23 March-29 March 2022. Smithsonian Institution and US Geological Survey.

Previous news

Wed, 30 Mar 2022, 09:05

São Jorge volcano update: Magnitude 4 quake rattles island

Seismic trace of ROSA station on São Jorge island, showing the magnitude 4 quake in the evening
The seismic swarm continues with the first occurrence of a widely felt magnitude 4 quake last night at 9:56 pm local time, the strongest so-far in the current swarm. The quake was about 10 times larger than the previous largest-so-far quake, a magnitude 3.3 event at 6.41 pm on 19 March. ... Read all
Tue, 29 Mar 2022, 07:08

São Jorge Island (Azores): likelihood of eruption increases as 20 million cubic meters of magma estimated intruded at depth

Detected ground deformation at São Jorge island (image: CIVISA)
According to latest calculations, the Volcanological Institute of the Canary Islands (INVOLCAN) estimated that as much as 20 million cubic meters of magma have intruded under the island of São Jorge since last March 19. ... Read all
Show more
São Jorge volcano
fissure vents 1053 m
Azores Islands, Portugal, 38.66°N / -28.11°W
Current status: restless (2 out of 5) São Jorge volcano eruptions:
1580, 1808
Typical eruption style
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