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Can Earthquakes Be Predicted?

So far, scientists have not found a reliable predictor of high-magnitude earthquakes.
To some degree, earthquakes can be scientifically predicted by observing changes in the cracks that are found in rock formations.
A home destroyed by an earthquake.
For the most part, large earthquakes still can't be predicted with accuracy.
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  • Written By: Michael Anissimov
  • Edited By: Niki Foster
  • Last Modified Date: 20 October 2014
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Earthquakes happen when tectonic plates under the continents slip past each other violently, causing severe vibrations. Unlike eclipses, predicting earthquakes was entirely impossible prior to the 1970s. However, some headway has been made in recent decades.

In February 1975, scientists predicted an earthquake five hours in advance. The earthquake occurred in Haicheng in northeast China and it was the first time an earthquake prediction bore true. Millions of people had time to evacuate their homes and factories before the earthquake hit, saving tens of thousands of lives. Although many towns were totally destroyed, only a few hundred people died.

Another Chinese earthquake took place near T'ang-shan in August 1976. Although the earthquake was predicted a few years in advance, around 700,000 people still died from the quake. Long-term predictions seem to have limited value.

Earthquakes can be scientifically predicted by observing tiny cracks in rocks and how they widen when the rock is under stress. Other changes are also observable when a rock starts to compress, including changes in electrical resistance and the speed at which sound waves propagate through the rock. The swelling of cracks in a rock before it breaks is called dilantancy. It begins when the force on the rock is about half the force required for it to break.

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In Russia and The United States, small earthquakes have been predicted up to five years in advance, but predicting large earthquakes or earthquakes around certain faults can be difficult. The rate of certainty has to be high for a warning to be issued. Earthquake prediction is still very much an imperfect science.

In 1966 at Denver, Colorado, waste liquids were injected at high pressure into a well. This loosened the friction between rocks in a fault, causing small earthquakes. Using this technique to release pressure at places like the San Andreas fault has been discussed, but not yet implemented. Clearly, smaller controlled quakes are preferable to a huge release of tectonic stress. Earthquakes disturbing the operation of nuclear power plants is a particular concern prompting research into predicting their occurrence.

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anon95030
Post 5

If you inject water into a fault that has pressure built up already, you could trigger a large earthquake. It is also possible that a certain area might not have been ready to slip, but it would have ruptured as an aftershock. If this area ruptures because of injection, a larger area would have slipped, producing a larger earthquake than would have normally happened.

Pawlentyj
Post 4

ca and alaska are huge. on good friday of 1964 a 9.2 quake hit alaska(called the largest ever in us- most recent easter of 2010 in mexico, inauguration day in chile).

To me that's insane but i think why not try it out on san andreas? Supposedly the 'big one' is on its way this year of 2010, so what could it hurt?

anon22660
Post 1

what was the most destructive earthquake in the united states? How many lives did it claim.

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