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Irazú

Irazu

Stratovulcano · Costa Rica · 3436 m

A lake occupies one of the Irazú summit craters (seen here from the southern crater rim in 1996), which has been the source of many recent eruptions. The first well-documented eruption of Irazú occurred in 1723, and frequent explosive eruptions have occurred since. Ashfall from its last major eruption during 1963-65 caused significant disruption to San José and surrounding areas.
A lake occupies one of the Irazú summit craters (seen here from the southern crater rim in 1996), which has been the source of many recent eruptions. The first well-documented eruption of Irazú occurred in 1723, and frequent explosive eruptions have occurred since. Ashfall from its last major eruption during 1963-65 caused significant disruption to San José and surrounding areas. · Foto: Photo by José Enrique Valverde Sanabria, 1996 (courtesy of Eduardo Malavassi, OVSICORI-UNA). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Costa Rica
Regione
Middle America-Caribbean Volcanic Regions / Central America Volcanic Arc
Altitudine
3436 m
Coordinate
9.979, -83.852
Ultima eruzione
1977
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The massive Irazú volcano in Costa Rica, immediately E of the capital city of San José, covers an area of 500 km2 and is vegetated to within a few hundred meters of its broad summit crater complex. At least 10 satellitic cones are located on its S flank. No lava effusion is known since the eruption of the Cervantes lava flows from S-flank vents about 14,000 years ago, and all known Holocene eruptions have been explosive. The focus of eruptions at the summit crater complex has migrated to the W towards the main crater, which contains a small lake. The first well-documented eruption occurred in 1723, and frequent explosive eruptions have occurred since. Ashfall from the last major eruption during 1963-65 caused significant disruption to San José and surrounding areas. Phreatic activity reported in 1994 may have been a landslide event from the fumarolic area on the NW summit (Fallas et al., 2018).

Sintesi da Wikipedia

L'Irazú (3.432 m s.l.m.) è il più alto vulcano della Costa Rica, ed è anche uno dei più attivi. Fa parte dell'Arco vulcanico dell'America centrale.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
640 BCE~452 BCE · 1 eruzioni · VEI max. 3301~489 · 1 eruzioni · VEI max. 3677~865 · 1 eruzioni · VEI max. 31053~1241 · 1 eruzioni · VEI max. 31430~1618 · 1 eruzioni · VEI max. 31618~1806 · 3 eruzioni · VEI max. 31806~1994 · 23 eruzioni · VEI max. 3640 BCE76 BCE67712411806

Cronologia dettagliata

  1. 1994VEI 2Osservata
    1994-12-08 – 1994-12-08
    Upper NW flank
  2. 1977VEI 1Osservata
    1977-03-03 – In corso
  3. 1963VEI 3Osservata
    1963-03-13 – 1965-02-13
  4. 1939VEI 2Osservata
    1939-05-18 – 1940-02
  5. 1933VEI 2Osservata
    1933-03-22 – 1933-07-25
  6. 1930VEI 2Osservata
    1930-10 – In corso
  7. 1928VEI 2Osservata
    1928-02-14 – 1928-05-26
  8. 1924VEI 2Osservata
    1924-03 – 1924-04
  9. 1917VEI 3Osservata
    1917-09-27 – 1921
  10. 1914VEI ?Stima geologica
    1914-02-21 – In corso
  11. 1909VEI 2Stima geologica
    1909 – In corso
  12. 1886VEI 2Osservata
    1886 – In corso
  13. 1885VEI 2Osservata
    1885 – In corso
  14. 1882VEI 2Stima geologica
    1882 – In corso
  15. 1875 (±5 anni)VEI 2Osservata
    1875 – In corso
  16. 1864VEI 2Osservata
    1864-09-16 – 1864-09-17
  17. 1847VEI 2Osservata
    1847-05-18 – In corso
  18. 1844VEI 2Stima geologica
    1844-05 – In corso
  19. 1842VEI 2Osservata
    1842 – In corso
  20. 1826VEI ?Stima geologica
    1826 – In corso
  21. 1823VEI 2Osservata
    1823 – In corso
  22. 1822VEI 2Osservata
    1822-05-07 – In corso
  23. 1821VEI 2Stima geologica
    1821-05 – In corso
  24. 1775VEI 2Osservata
    1775 – In corso
  25. 1726VEI 2Osservata
    1726-05 – In corso
    Diego de la Haya Crater
  26. 1723VEI 3Osservata
    1723-02-16 – 1724-02
    Diego de la Haya Crater
  27. 1560 (±75 anni)VEI 3Stima geologica
    1560 – In corso
  28. 1110 (±100 anni)VEI 3Stima geologica
    1110 – In corso
  29. 690 (±40 anni)VEI 3Stima geologica
    690 – In corso
  30. 430 (±500 anni)VEI 3Stima geologica
    430 – In corso
  31. 640 a.C. (±500 anni)VEI 3Stima geologica
    BCE 640 – In corso

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.