Earth Quake
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Transcript of Earth Quake
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EARTH QUAKES
Presentation by AJA.V.P
Prepared by SARATH BABU.M.G
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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
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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
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Seismic waves•When earthquakes occur, waves of energy SEISMIC WAVES travel outward from the earthquake focus
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Major Seismic waves
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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’
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EFFECTS
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Effects Formation of cracks or fissures in the region of epicenter
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Effects Earth quake cause landslides
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Effects Seismic sea waves (TUSNAMIS)
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Effects Damage to human life and structures
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EffectsFaults, thrust and folds
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Other Effects More devastating fires Change in surface drainage and underground
circulation of water Depression forming lakes
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Distribution
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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.
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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)
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Conclusion
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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.
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Questions
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THANK YOU