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Science of Earthquakes (2:32)

Over a million earthquakes occur every year, but most happen in remote areas and on the ocean floor. Find out what causes earthquakes, and how they are monitored. With Dr. Maya Tolstoy of the Lamont-Doherty Earth Observatory, Columbia University.

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Videos (4)

  • Science of Earthquakes
    Science of Earthquakes

    Video Clip (2:32)

    Over a million earthquakes occur every year, but most happen in remote areas and on the ocean floor. Find out what causes earthquakes, and how they are monitored. With Dr. Maya Tolstoy of the Lamont-Doherty Earth Observatory, Columbia University.

    Video Clip (2:32)
  • Mexico Part I
    Mexico Part I

    Video Clip (1:20)

    On July 11, 1991 Mexico became a hotbed of UFO activity. Millions have seen and hundreds filmed, objects in the skies of Mexico.

    Video Clip (1:20)
  • Mexico Part II
    Mexico Part II

    Video Clip (1:49)

    During the 1990s Mexico became ground zero for UFO sightings. This is some of the best evidence for UFOs caught on video.

    Video Clip (1:49)
  • Mega Disasters: San Francisco Earthquake
    Mega Disasters: San Francisco Earthquake

    Video Clip (2:15)

    Multiple fault lines that run through California put San Francisco at risk for a catastrophic earthquake.

    Video Clip (2:15)

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Read More about Mexico City earthquake of 1985

On September 19, 1985, a powerful earthquake struck Mexico City and left 10,000 people dead, 30,000 injured and thousands more homeless.

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