Today in Earthquake History

Earthquake History for July 31st

  •  M6.5 - Panama, 2002

    At least 11 people injured, some houses collapsed and many buildings damaged (VII) in Baru. Buildings damaged at Alanje and David. A wharf was damaged at Puerto Armuelles. Felt strongly in Bocas del Toro and Chiriqui Provinces. Four people injured, 6 homes collapsed and dozens damaged at Laurel, Costa Rica. Four people injured and some houses damaged at Neily, Costa Rica. Felt strongly in Buenos Aires, Corredores, Coto Brus and Golfito Cantons, Costa Rica.
    From Significant Earthquakes of the World 2002.
  •  M8.0 - Colombia, 1970

    One killed, several injured, and property damage reported in Peru. Felt from Buenos Aires, Argentina, to Mexico City, Mexico, and throughout the Caribbean.
  • M - Ireland, 1858

    Geologist and seismologist who discovered the evidence for the existence of the Earth's core.
    In 1897, Oldham noticed that seismograms from earthquakes consistently showed three different disturbances, the first and second "preliminary tremors" (now known as P waves and S waves, respectively) and the "large waves" that followed the preliminary tremors, and that the difference in arrival time between the "large waves" and the "preliminary tremors" increased in a predictable fashion with increasing distance from the earthquake.
    In 1900, he established that the "preliminary tremors" (P and S waves) have travel paths that take them through the body of the Earth (we now call them body waves), and that the "large waves" (now called surface waves) travel along the Earth's surface.
    In 1906, Oldham used evidence from eathquake waves to demonstrate the existence of a large central core at a depth of about 3,821 km beneath the Earth's surface.

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