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Earthquake Part 2: Distribution, Classification
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This lesson deals with continental plates, distribution and classification of earthquakes and lot more.

Bhumika Saini
B Tech from MNIT, Jaipur. Appeared in CSE interview thrice. Loves teaching and playing badminton.

U
nice sir jee
Thank you ! Could you please explain how content of water in soil affects the damage caused by an earthquake?
Abhishek Kumar
2 years ago
Look, Shear strength of a soil describe the magnitude of the shear stress that a soil can sustain. The shear resistance of soil is a result of friction and interlocking of particles. Due to the excessive amount of water, the pore hole of soil is completely filled with water and subsequently loose their strength which leads to the more disastrous structural damage.
Abhishek Kumar
2 years ago
Ab earthquakeke samay aise hi time kharab hai 'S waves' or upar se soil ke interlocking (bonding) water ke karan easily slip karta hai.
can anyone explain what was the reason behind the earthquake in Gujarat in 2001?? Gujarat is perhaps neither on the convergent boundary nor on the divergent boundary??
mam kindly clarify--- it is written in ncert that deep-trenches = deep seated earthquakes ; mid-oceanic ridges =quake foci has shallow depth but we know that explosive earthquakes occur at trenches and also that shallow depth foci are more destructive. isn't this contradictory ??
solid work ma'am, thx for your deep knowledge about volcano and eq. It helps us a lot.
I used majid Hussain for more than 2 hrs in this topics and did a lots of note making and googling...but u made it all in half an hour...thank u...extremely useful for me
1. Causes of earthquake - Plate tectonics provides the most logical explanation of volcanoes and earthquakes. There are 3 types of plate boundaries along which earthquake occurs - There are 3 types of plate boundaries along 1.convergent 3 Transform 2 Divergent

2. The Continental Plates Norch Anerican Plate late Pacific Plate African Nazca South Plate Amcrican Indian Austin lian Plate Plate Antarctic Plate spreading boundary Converging boundary/transform boundary

3. SCHEMATIC CROSS SECTION OF PLATE TECTONICS CONTINENTAL RIFT ZONE YOUNG DIVERGENT PLATE BOUNDARY) DIVERGENT CONVERGENT PLATE BOUNDARY TRANSFORM PLATE BOUNDARY PLATE BOUNDARY CONVERGENT PLATE BOUNDARY SHIELD VOLCANO STRATO CONTINENTAL CRUST OCEANIC CRUST HOTSPOT ASTHENOSPHERE MANTLE

4. Three Basic Types of Plate Boundaries UTHOSPHERE OCEANIC CRUST MANTLE

5. Distribution of Earthquakes -80% of all earthquakes occur in the circum-Pacific belt - most of these result from convergent margin activity ~15% occur in the Mediterranean-Asiatic belt . remaining 5% occur in the interiors of plates and on spreading ridge centers

6. Classification of earthquakes On basis of causative factors On basis of depth On basis of human casualities of focus . Natural . Moderate(o- . Moderate (deaths<50,00) . Volcanic . Tectonic artificial 5okm) Intermediate(50- 25okm) Deep focus( 250- 7o0km) . Highly hazardous( 51,000-1,oo,oo) Most hazardous( (>1,00,00)

7. Damage caused by earthquakes - Slope instability and landslides Damage to human structures . Damage to towns and cities Loss of human lives Fires - Deformation of ground surface Flash floods - Tsunamis

8. Damage -Amount & duration of shaking water content of soil Population concentration - Building construction Distance from Epicenter - Depth of focus

9. Addressing the Hazard Identity areas at risk/vulnerability mapping . Structural adaptations arning systems Satellite transponder Signal key Worning signal Detection signal Ground relay station User of system seismometer) Data acquisition and e processing (worningnn | IwarningD issued from here! |

10. Thank you