Question

1. Is it possible to predict about earthquake in advance?
1. What is an earthquake?
3. Write two main causes of earthquakes.
4 Name waves produced before the occurrence of an earthquake.
5. What is seismic focus and epicentre?
6. What do you understand by seismic-zones?​

Answer 1

Answer:

1.NOT POSSIBLE

2.SUDDEN SHAKING OF EARTH

3.TECTONIC PLATE MOVEMENT..

4.SEISMIC WAVES

Answer 2

1.A) While part of the scientific community hold that, taking into account non-seismic precursors and given enough resources to study them extensively, prediction might be possible, most scientists are pessimistic and some maintain that earthquake prediction is inherently impossible.

2.A) An earthquake is the result of a sudden release of stored energy in the Earth's crust that creates seismic waves. In its most generic sense, the word earthquake is used to describe any seismic event—whether a natural phenomenon or an event caused by humans—that generates seismic waves.

3.A) Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little.

4.A) Traveling through the interior of the earth, body waves arrive before the surface waves emitted by an earthquake. These waves are of a higher frequency than surface waves. The first kind of body wave is the P wave or primary wave.

5.A) The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus. See also epicenter.

6.A) A seismic zone is used to describe an area where earthquakes tend to focus; for example, the New Madrid Seismic Zone in the Central United States. A seismic hazard zone describes an area with a particular level of hazard due to earthquakes.

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