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Why does the earthquake depth change?

Is it possible to detect the earthquake at deeper depth earlier by placing the sensor over there?

  • By drilling a well upto 6 or 7 kms deep and if sensor is kept there to give the tectonic movements trend signals to surface by remote or electrically will it help to predict earthquake atleast some hours or minutes before?

  • Answer:

    its hardly any use being so close to the source. The rumble generated by earthquakes travels fast so there's no point in monitoring close to the source. Ok, the signal will be a bit louder but it's far more interesting to have lots of seismometers distributed on the earth's surface near a fault. Ever noticed that it's difficult to peek through a dense hedge from a fixed spot ? You can see a lot more when you walk past the hedge and look through the hedge continuously. You catch fragments of images and your brains constitutes a fairly complete image of what's beyond. The same in disciplines such as seismology but also when scanning a body in hospital. The sensor moves around and builds a detailed image of your inner workings.

rajr59 at Yahoo! Answers Visit the source

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When measuring earthquakes, scientists actually use two sets of signals, body waves and surface waves. For the well to give us an indicator of when an earthquake is coming, we care about when the well would sense the first wave, to when a surface seismometer would The first signal to arrive is the compression waves which travel directly through the earth's core, and are extremely fast, moving at 5000 m/s through granite. If we are directly above the epicenter, it would take at most 2 seconds for the compression wave to travel from the bottom of the well to the top, and so would give us two extra second minus the time to transmit (~1 microsecond) to prepare for the coming earthquake. The further away from the epicenter, the smaller this difference would be, and so this is why we don't build wells to detect earthquakes.

Steve

As any natural things forms bell curve that is it starts at lessor intensity and reaches the peak before it dies.The same way earthquake produces the feeble primary wave first and then the destructive secondary waves from body of the earth .Then comes the most dangerous waves like L wave And Raleigh waves from the surface of the earth. Now Japan is trying to sense the earthquake waves from a depth of 7000 meters under the sea. As we go deeper the reliability of measuring the seismic waves will be good. Because of several reason sensing at the earth surface and the condition of ground will give some false reading.Let us wait until the Japanese come with the useful result.

A.Ganapathy India

great idea..how about putting a sensor in the bottom of the well to see if the water is more wet there than it is at the top.....

huh ???

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