Tag: earthquakes

Questions Related to earthquakes

Anatomy of earthquake includes ______.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. P-waves

  2. S-waves

  3. T-waves

  4. All of these

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Correct Option: A,B
Explanation:
Multiple Answers
A. P-waves
B. S-waves

Two types of particle motion result in two types of body waves: Primary and Secondary waves.

Primary waves (P-waves) are compressional waves that are longitudinal in nature. P waves are pressure waves that travel faster than other waves through the earth to arrive at seismograph stations first, hence the name "Primary". These waves can travel through any type of material, including fluids, and can travel at nearly twice the speed of S waves. In air, they take the form of sound waves, hence they travel at the speed of sound.

Secondary waves (S-waves) are shear waves that are transverse in nature. Following an earthquake event, S-waves arrive at seismograph stations after the faster-moving P-waves and displace the ground perpendicular to the direction of propagation. Depending on the preoperational direction, the wave can take on different surface characteristics; for example, in the case of horizontally polarized S waves, the ground moves alternately to one side and then the other. S-waves can travel only through solids, as fluids (liquids and gases) do not support shear stresses

The point of origin of waves of earthquake is called as ________________.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. Seismic focus

  2. Seismic line

  3. Seismic centre

  4. None of these

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Correct Option: A
Explanation:

The Focus or Seismic Focus is also called the hypocenter of an earthquake. The vibrating waves travel away from the focus of the earthquake in all directions. The waves can be so powerful they will reach all parts of the Earth and cause it to vibrate like a tuning fork. The focus is the exact point inside the crust of the earth where the quake begins.

In 1906 San Andreas Fault of California gave rise to major earthquake because of __________.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. plate tectonic

  2. folding and faulting

  3. volcanic activity

  4. none of these

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Correct Option: B

The vibration of earthquakes, last from a few seconds to several minutes, called as ______.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. duration

  2. period

  3. hour

  4. none of these

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Correct Option: A
Explanation:

Duration is the vibration of earthquakes which can be felt by human beings that last from a few seconds to several minutes. Generally, the greater the intensity of the shocks, the longer they last. The average duration of shocks of sufficient intensity to produce much damage is perhaps from one to two minutes.

There are annually 8,000-10,000 earthquakes in the world, which comes to about an earthquake every hour known as, ____________.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. Earthquake velocity

  2. Earthquake frequency

  3. Earthquake wave

  4. None of these

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Correct Option: B
Explanation:

There are annually 8,000 - 10,000 earthquakes in the world, which comes to about an earthquake every hour. And there are many more that go undetected because there are no stations to record them over the oceans covering a very large surface of our earth. This is known as the Earthquake Frequency

On the Earth's surface the maximum damage occurs at ____________.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. epicentre

  2. focus

  3. both a and b

  4. none of these

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Correct Option: A
Explanation:

The epicenter is the point on the earth's surface vertically above the focus of the earthquake. Maximum damage is caused at the epicenter.

A line connecting all points on the surface of the earth where the intensity of shock produced by earthquake waves is the same.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. Isosismic line

  2. Isohyte lines

  3. Isobars

  4. Isotherm lines

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Correct Option: A
Explanation:

Isoseismic Line is the line connecting all points on the surface of the earth where the intensity is the same. These lines show great irregularity in their form. 

India is divided into how many seismic zones according to the earthquake zoning map _________.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. 3

  2. 4

  3. 5

  4. 7

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Correct Option: B

On April 25th, 2015 a 7.8 Richter scale earthquake hit _______.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. Gujarat

  2. Maharashtra

  3. Nepal

  4. Sikkim

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Correct Option: C

Find the odd one out and give explanation for your choice.

geography our changing earth earthquake and volcanoes earthquake earthquakes

  1. Tectonics

  2. Centrifugal Force

  3. Solar energy

  4. Precipitation

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Correct Option: A