|
Year |
Location |
Magnitude |
Comment |
|
1858 |
Dublin, Ireland
|
|
150th Anniversary
Richard Dixon Oldham born.
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.
|
|
1970 |
Colombia
|
8.0 |
One killed, several injured, and property damage
reported in Peru. Felt from Buenos Aires, Argentina,
to Mexico City, Mexico, and
throughout the Caribbean.
|
|
2002 |
South of Panama
|
6.5 |
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.
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