Note on Earthquake

  • Note
  • Things to remember
  • Videos
  • Exercise
  • Quiz

The shaking and vibrating of the earth's surface is called an earthquake. The shaking may vary between very small tremors to a violent vibration.

Types of earthquake

On the basis of the nature of shaking, earthquakes are classified as vertical and horizontal. In the vertical earthquake, the vibration is up and down and in the horizontal earthquake, the vibration is lateral. Horizontal earthquake is more devastating because collapsing of buildings occur more in it.

Safety measures of earthquake
  1. Earthquake resistant buildings should be made.
  2. If we are outside the houses at the time of an earthquake, we should move towards the open place.
  3. If we are inside the house at the time of an earthquake, we should try to protect our life by hiding our body under the door frame, table etc.
  4. If we are in a classroom at the time of the earthquake, we should protect ourselves by crawling under school furniture.
  5. The doors of classroom and other public places should be made in such a way that they open outward.

  • The shaking and vibrating of the earth's surface is called earthquake.
  • On the basis of nature of shaking, earthquakes are classified into vertical and horizontal.
  • The doors of classroom and other public places should be made in such a way that they open outward.
.

Very Short Questions

Earthquake is defined as shaking or vibrating of earth surface.
Any three causes of earthquake are:
i) Tectonic activities: The surface of earth is affected by the tectonic forces. Tectonic forces include compression and tension in the plates. Due to these forces, faults occur on the earth crust, which make certain portion of the plate to rise up and some other portion to fall down. Such phenomenon produce vibration on the earth surface and earthquake occurs.
ii) Volcanic eruption: During volcanic eruption, lava comes out with a force resulting disturbances on the adjoining area of the earth crust causing an earthquake. Generally, volcanic eruption is followed by earthquake.
iii) Other causes: Other causes of earthquake are: Expansion and contraction of rocks, structures of the land surface, flood, landslide and soil erosion, artificial explosion during the construction of tunnels, roads, mine etc. it disturbs the earth surface and cause earthquake.

The point on the surface of the earth vertically above the hypocenter is called an epicenter of the earthquake.
The science that deals with the study of an earthquake is called seismology.

The scale that measures the magnitude of earthquake is called Richter scale.

On the basis of nature of shaking earthquakes are classified into two types. They are:
i) Vertical earthquake
ii) Horizontal earthquake
In vertical earthquake, the vibration is up and down and in horizontal earthquake, the vibration is lateral. Horizontal earthquake is more devasting than vertical earthquake.

The effects of earthquake on environment are listed below:
i) It may form cracks on the earth's surface and weaken the rocks for landslide.
ii) It destroys life and property.
iii) It destroys development structures like roads, canals, communication networks, electrical supply and water supply.
iv) It collapses monuments, buildings, temple, towers and industries.
v) Water resources get contaminated during earthquake which leads many types of diseases.

Safety measures of earthquake are listed below:
i) Earthquake resistant buildings should be built.
ii) Education concerning the safety measures of earthquake should be introduced in the school curriculum.
iii) The public should be made aware of way of self-protection from earthquake.
iv) Skillful volunteer manpower should be developed and kept alert for emergency rescue.

Precautions to be adopted during earthquake are as follows:
i) As far as possible crouch under the table and protect head from injury. Stand on the frame of door until the shaking stops and stand from the sides of window and outer wall ofhouse.
ii) Help to evaluate disabled people like children, old aged people.
iii) Stay far from big rocks, glasses and weak walls.
iv) Turn off gases, electric current and water supply as soon as possible.
v) Stay in a safety place with patience and follow the instruction broad cast from radio by the government.

0%
  • The shaking and vibrating of the earth surface is called ______.

    earthquake


    cyclone


    volcano


    hurricane


  • Into how many types are earthquakes classified, on the basis of nature of shaking?

    4
    3
    2
    6
  • Which one of them is a computerized instrument used for measuring earthquake?

    Spygnomanometer


    hydrometer


    Seismograph


    seismogram


  • Earthquakes having magnitude more than ______ richter scale are more devastating.

    7


    2


    10


    13


  • Magnitude of earthquake is measured in the unit termed as _______.

    celcius scale


    meter scale


    kelvin scale


    Richter scale


  • You scored /5


    Take test again

DISCUSSIONS ABOUT THIS NOTE

You must login to reply

Forum Time Replies Report
why does it occurs


You must login to reply