FAQ







Terceira

Google Earth Placemark
  • Portugal
  • Azores
  • Stratovolcano
  • 2000
  • Country
  • Subregion Name
  • Volcano Type
  • Last Known Eruption
  • 1023 m
    3355 ft
  • 38.730°
  • -27.320°
  • Elevation
  •  
  • Latitude
  • Longitude

There are no activity reports for Terceira.



 Available Weekly Reports


There are no Weekly Reports available for Terceira.

Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1998 Nov 25 (?) 2000 Mar (?) Confirmed 0 Historical Serreta Ridge (submarine vent W of Terceira)
1867 Jun 1 1867 Jun 8 Confirmed 3 Historical Submarine vent 3-6 WNW of Terceira
1761 Apr 17 1761 Apr 28 (?) Confirmed 2 Historical Fissure zone (east of Santa Barbara)
1400 ± 50 years Unknown Confirmed   Tephrochronology Farol I dome (Santa Barbara)
1200 ± 300 years Unknown Confirmed   Tephrochronology Guilherme Moniz (Pico Alto)
920 ± 50 years Unknown Confirmed   Radiocarbon (uncorrected) Guilherme Moniz (Quinta da Madalena)
820 ± 40 years Unknown Confirmed   Radiocarbon (uncorrected) Santa Barbara
190 ± 40 years Unknown Confirmed   Radiocarbon (uncorrected) Guilherme Moniz (Pico Alto)
70 ± 40 years Unknown Confirmed   Radiocarbon (uncorrected) Fissure zone (east of Santa Barbara)
60 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected) Fissure zone (south of Pico Alto)
90 BCE ± 100 years Unknown Confirmed   Radiocarbon (uncorrected) Fissure zone (east of Santa Barbara)
670 BCE ± 300 years Unknown Confirmed   Radiocarbon (uncorrected) Guilherme Moniz, Biscoito Rachado deposit
940 BCE ± 50 years Unknown Confirmed   Radiocarbon (uncorrected) Santa Barbara NW flank (Lagoinha dome)
2530 BCE ± 40 years Unknown Confirmed   Radiocarbon (uncorrected) Fissure zone (east of Santa Barbara)
6720 BCE ± 50 years Unknown Confirmed   Radiocarbon (uncorrected) Guilherme Moniz (Pico das Pardelas)

Terceira Island contains four stratovolcanoes constructed along a prominent ESE-WNW-trending fissure zone that cuts across the island. Historically active Santa Barbara volcano at the western end of the island is truncated by two calderas. The youngest of these formed about 15,000 years ago. Comenditic lava domes fill and surround the caldera. Pico Alto lies north of the fissure zone in the north-central part of the island and contains a Pleistocene caldera largely filled by lava domes and lava flows. Guilherme Moniz caldera lies along the fissure zone immediately to the south, and 7-km-wide Cinquio Picos caldera at the SE end of the island is the largest in the Azores. Historical eruptions have occurred from Pico Alto, the fissure zone between Pico Alto and Santa Barbara, and from submarine vents west of Santa Barbara. Most Holocene eruptions have produced basaltic-to-rhyolitic lava flows from the fissure zone transecting the island.