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    Timeline - Mt. Pinatubo

    Uploaded by

    Ruby Wright
    The Mount Pinatubo volcano in the Philippines began stirring in July 1990, with earthquakes measuring 7.8 on the Richter scale. In March 1991, local villagers noticed increasing seismic activity. By April 1991, fumeroles near the summit were exploding, emitting ash and dust that forced the evacuation of 5,000 people. Eruptions continued through May and early June 1991, with sulfur dioxide levels and seismic activity rising. This led to a major eruption on June 15, 1991 that lasted 9 hours, blanketing over 2,000 square kilometers with tephra and generating lahars that destroyed land and villages.

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    Timeline - Mt. Pinatubo

    Uploaded by

    Ruby Wright
    7 views1 page
    The Mount Pinatubo volcano in the Philippines began stirring in July 1990, with earthquakes measuring 7.8 on the Richter scale. In March 1991, local villagers noticed increasing seismic activity. By April 1991, fumeroles near the summit were exploding, emitting ash and dust that forced the evacuation of 5,000 people. Eruptions continued through May and early June 1991, with sulfur dioxide levels and seismic activity rising. This led to a major eruption on June 15, 1991 that lasted 9 hours, blanketing over 2,000 square kilometers with tephra and generating lahars that destroyed land and villages.

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    The Mount Pinatubo volcano in the Philippines began stirring in July 1990, with earthquakes measuring 7.8 on the Richter scale. In March 1991, local villagers noticed increasing seismic activity. By April 1991, fumeroles near the summit were exploding, emitting ash and dust that forced the evacuation of 5,000 people. Eruptions continued through May and early June 1991, with sulfur dioxide levels and seismic activity rising. This led to a major eruption on June 15, 1991 that lasted 9 hours, blanketing over 2,000 square kilometers with tephra and generating lahars that destroyed land and villages.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    7 views1 page

    Timeline - Mt. Pinatubo

    Uploaded by

    Ruby Wright
    The Mount Pinatubo volcano in the Philippines began stirring in July 1990, with earthquakes measuring 7.8 on the Richter scale. In March 1991, local villagers noticed increasing seismic activity. By April 1991, fumeroles near the summit were exploding, emitting ash and dust that forced the evacuation of 5,000 people. Eruptions continued through May and early June 1991, with sulfur dioxide levels and seismic activity rising. This led to a major eruption on June 15, 1991 that lasted 9 hours, blanketing over 2,000 square kilometers with tephra and generating lahars that destroyed land and villages.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 1

    July 1990:

    The volcano came back


    to life and first stirred,
    earthquakes measured
    7.8 on the Richter scale
    100km northeast of
    Pinotubo

    April 2, 1991:
    Fumeroles gave off
    explosions near the
    summit. Ash and dust
    covered nearby villages,
    triggering the
    evacuation of 5000

    Early June 1991:


    Sulfur dioxide levels
    had declined. Nearly
    50000 had been
    evacuated. Ash
    ejections were
    observed on June
    3rd , followed by a
    small explosion type
    earthquake on June

    Previous
    Eruptions:
    500 y.a., 3000
    y.a., 5500 y.a.

    March 1991:
    Local villagers notice
    earthquakes
    progressively
    growing in
    magnitude

    May 1991
    Continued seismic
    activity. Sulfur
    dioxide levels were
    rising indicating the
    rise of magma.

    July 11, 1991:


    First major eruption
    occurred: ash and
    smoke went 15km
    high

    June 15 1991:
    Major Eruption occurs at
    1:42pm local time and
    lasted a full 9 hours. More
    than 2000km^2 of villages
    and land are blanketed
    with Tephra. Cyclone Yuna
    blows volcanic material in
    all directions, also creating
    Lahars that covered
    hundreds of square
    kilometers in muddy

    Continued
    Lahars:
    Lahars are
    created most wet
    seasons, by 1997
    over 100 000
    homes had been
    destroyed.

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