Question

When a pebble is thrown into a pond, disturbances are produced at the point of interaction and spread out away
from this point of interaction over the surface of water. In the same manner, waves during earthquake move
outwards from a point on the earth surface.
a) Name these waves and the point on the earth surface.
b) How the intensity of the earthquake vary with the distance from the above mentioned point?
c) What is the point of the origin of earthquake called?
d) Also name the instrument used to find out the source of earthquake?​

Answer 1

Hey, the answers to your questions are as given below.

a) These waves are called Seismic Waves. The point directly above the origin of these waves is called the Epicenter

b) The intensity of Earthquake decreases as the distance from the Epicenter increases

c) The point of origin of an earthquake is called its Epicenter

d) The instrument used is called a Seismograph.

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Answer 2

Answer:

1. When the force of the moving blocks finally overcomes the friction of the jagged edges of the fault and it unsticks, all that stored up energy is released. The energy radiates outward from the fault in all directions in the form of seismic waves like ripples on a pond.
2. The violence of seismic shaking varies considerably over a single affected area. Because the entire range of observed effects is not capable of simple quantitative definition, the strength of the shaking is commonly estimated by reference to intensity scales that describe the effects in qualitative terms.
3. The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. Sometimes an earthquake has foreshocks.
4. Earthquakes are usually measured by seismometers.