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Furnas volcano
stratovolcano 805 m
Sao Miguel Island, Azores, 37.76°N / -25.33°W
Current status: dormant (1 out of 5)
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Furnas volcano eruptions:
1439 and 1443 and another in 1630
Typical eruption style:
Explosive
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Furnas volcano news & activity updates:

Furnas volcano (Sao Miguel Island, Azores): earthquake swarm

Tuesday Feb 13, 2018 15:37 PM | BY: T

Location of the past days' earthquakes on Sao Miguel island
Location of the past days' earthquakes on Sao Miguel island
Distribution of quakes as depth vs time (the smaller quakes have no given depth from the dataset)
Distribution of quakes as depth vs time (the smaller quakes have no given depth from the dataset)
An earthquake swarm has been going on since Monday (12 Feb 2018) in central Sao Miguel island.
The Volcano Observatory (Observatório Vulcanológico e Sismológico da Univ. dos Açores, CIVISA) recorded dozens of mostly small quakes at shallow depths between 1-15 km in an area about 6-7 km west of Furnas volcano, half way between the caldera lakes of Lagunas Fogo and do Congro. The largest were 6 earthquakes of magnitudes 3.0-3.6, some of which were felt by local inhabitants.
At the moment, the activity is still continuing, but has decreased significantly. It is unclear whether the earthquakes are volcanic in origin or not. If so, they could have been caused by a small magma intrusion at the lower crust and indicate an early sign of possible re-awakening of the volcanic system.
The only recorded eruptions in the area came from Furnas volcano, one around 1439-1443 and a strong explosive one in 1630, which caused significant damage and fatalities.
The situation remains to be monitored closely.
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