earth quake

EARTH QUAKES

Presentation by AJA.V.P

Prepared by SARATH BABU.M.G

Introduction Any sudden disturbance

below the earth surface prodce vibration or shaking in he crust.

This sudden movement of the ground is called Earth Quake

Earth Quakes Origin The place origin of an

earthquake inside the earth is called its Focus

The point on the earth’s surface vertically above the focus is called the Epicenter

Seismic waves•When earthquakes occur, waves of energy SEISMIC WAVES travel outward from the earthquake focus

Major Seismic waves

Seismology The earth quakes are studied by a a

special of science is known as “Seismology”.

The word ‘seismology’ derived from the Greek word ‘seismos’ meaning ‘earth quake’.

The instrument recording the shock waves is called the Seismograph.

The instrument which used to measure the intensity of earthquake is known as ‘Richer Scale’

EFFECTS

Effects Formation of cracks or fissures in the region of epicenter

Effects Earth quake cause landslides

Effects Seismic sea waves (TUSNAMIS)

Effects Damage to human life and structures

EffectsFaults, thrust and folds

Other Effects More devastating fires Change in surface drainage and underground

circulation of water Depression forming lakes

Distribution

Distribution About 60 % of all

earthquakes are observed in the vast region of the pacific ocean as a ‘Ring of Fire’.

Major and Minor earthquakes are in Chile, California, Alaska, Japan, Philippines and New Zealand.

Distribution Some of the earth

quakes in India are : Kachchh earthquake (1819) Assam earthquake (1897) Kangra earthquake (1905) Bihar earthquake (1934) Assam earthquake (1950) Latur earthquake(1993)

Kashmir earth quake (2005)

Conclusion

Conclusion

More seismic stations can be established for issuing warning to the people of coming earthquakes. Sometimes our observations , like sudden changes in atmospheric conditions and abnormal behaviour of animals can help us to forecast the arrival of an earth quake.

Questions

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