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Irazú   »  Eruptive History

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Irazú

Start Date: 1994  Dec 8  Stop Date: 1994 Dec 8 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Area of Activity: Upper NW flank

Eruptive Characteristics:
    Flank (excentric) vent
    Explosive eruption
    Phreatic explosion(s)
    Mudflow(s) (lahars)

Start Date: 1977  Mar 3  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  1

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1974  Mar 2  Stop Date: 1974 Mar 7 

Eruption DISCREDITED

Area of Activity: (increased steaming: no eruption)
Start Date: 1967  Aug 7 

Eruption DISCREDITED

Area of Activity: (increased steaming: no eruption)
Start Date: 1963  Mar 13  Stop Date: 1965 Feb 13 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption
    Pyroclastic flow(s)
    Phreatic explosion(s)
    Lava dome extrusion
    Fatalities
    Damage (land, property, etc.)
    Mudflow(s) (lahars)
    Evacuation

Start Date: 1962  Aug 9 

Eruption DISCREDITED

Area of Activity: (fumarolic activity: no eruption)
Start Date: 1939  May 18  Stop Date: 1940 Feb 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption
    Damage (land, property, etc.)

Start Date: 1933  Mar 22 (?) Stop Date: 1933 Jul 25 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Tephra Volume:  1.3  x  106 m3

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption
    Damage (land, property, etc.)

Start Date: 1930  Oct  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1928  Feb 14  Stop Date: 1928 May 26 ± 5 days

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1924  Mar  Stop Date: 1924 Apr 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1917  Sep 27  Stop Date: 1921 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption
    Pyroclastic flow(s)
    Phreatic explosion(s)
    Damage (land, property, etc.)

Start Date: 1914  Feb 21 

Eruption is UNCERTAIN

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption  (?)

Start Date: 1910 

Eruption DISCREDITED

Area of Activity: (fumarolic activity only)
Start Date: 1909 

Eruption is UNCERTAIN

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption  (?)

Start Date: 1899 

Eruption DISCREDITED

Area of Activity: (fumarolic activity only)
Start Date: 1894 

Eruption DISCREDITED

Area of Activity: (no eruption this year)
Start Date: 1889  Feb 28 

Eruption DISCREDITED

Area of Activity: (fumarolic activity only)
Start Date: 1886  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2?

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1885  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2?

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1883  Jan 3 

Eruption DISCREDITED

Area of Activity: (fumarolic activity only)
Start Date: 1882 

Eruption is UNCERTAIN

Volcanic Explosivity Index (VEI):  2

Area of Activity: (possibly only fumarolic activity)

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption  (?)
    Fumarolic activity

Start Date: 1875 ± 5 years Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1864  Sep 16  Stop Date: 1864 Sep 17 

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1847  May 18  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1844  May 

Eruption is UNCERTAIN

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1842  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1826 

Eruption is UNCERTAIN

Area of Activity: (possibly only steam emission)

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption  (?)

Start Date: 1823  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2?

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1822  May 7  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1821  May 

Eruption is UNCERTAIN

Volcanic Explosivity Index (VEI):  2

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption  (?)

Start Date: 1775 (?)  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2?

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1726  May  Stop Date: Unknown

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  2

Area of Activity: Diego de la Haya Crater

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption

Start Date: 1723  Feb 16  Stop Date: 1724 Feb (?)

Dating Technique: Historical Records

Volcanic Explosivity Index (VEI):  3

Area of Activity: Diego de la Haya Crater

Eruptive Characteristics:
    Central vent eruption
    Explosive eruption
    Pyroclastic flow(s)
    Damage (land, property, etc.)
    Mudflow(s) (lahars)

Start Date: 1560 ± 75 years Stop Date: Unknown

Dating Technique: Radiocarbon (corrected)

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Explosive eruption

Start Date: 1110 ± 100 years Stop Date: Unknown

Dating Technique: Radiocarbon (corrected)

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Explosive eruption

Start Date: 690 AD ± 40 years Stop Date: Unknown

Dating Technique: Radiocarbon (corrected)

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Explosive eruption

Start Date: 430 AD ± 500 years Stop Date: Unknown

Dating Technique: Radiocarbon (corrected)

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Explosive eruption

Start Date: 640 BC ± 500 years Stop Date: Unknown

Dating Technique: Radiocarbon (corrected)

Volcanic Explosivity Index (VEI):  3

Eruptive Characteristics:
    Explosive eruption

Global Volcanism Program — Department of Mineral Sciences — National Museum of Natural History — Smithsonian Institution

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