This document discusses different types of earthquakes. It defines key terms like focus, hypocenter, and epicenter. Earthquakes are classified by depth of focus into shallow, intermediate, and deep. They are also classified genetically into tectonic and non-tectonic. Tectonic earthquakes result from rock deformation during mountain building and make up the majority. They are caused by elastic rebound, sudden shearing during plastic flow, and folding. Non-tectonic include volcanic quakes from magma movement and impact quakes from explosions or meteorite impacts.
Contents:
1. Concept of Earthquake
2. Hazards Associated to Earthquake
- Ground Shaking
- Ground Rapture
- Tsunami
- Earthquake induced landslide
3. What do to BEFORE, DURING, AFTER Earthquake
WHAT IS AN EARTHQUAKE?
Where Do Earthquakes Happen?
Why Do Earthquakes Happen?
How Are Earthquakes Studied?
How To Locate The Earthquake's Epicenter?
SCALES FOR EARTHQUAKE MEASUREMENT
What Are Earthquake Hazards?
Contents:
1. Concept of Earthquake
2. Hazards Associated to Earthquake
- Ground Shaking
- Ground Rapture
- Tsunami
- Earthquake induced landslide
3. What do to BEFORE, DURING, AFTER Earthquake
WHAT IS AN EARTHQUAKE?
Where Do Earthquakes Happen?
Why Do Earthquakes Happen?
How Are Earthquakes Studied?
How To Locate The Earthquake's Epicenter?
SCALES FOR EARTHQUAKE MEASUREMENT
What Are Earthquake Hazards?
What is earthquakes? What is the Elastic Rebound Theory?
Seismographs record earthquake events. Where Do Earthquakes Occur and How Often? What are the Destructive Effects of Earthquakes? How are the Size and Strength of an Earthquake Measured? Can Earthquakes be Predicted? Can Earthquakes be Controlled?
GEOGRAPHY IGCSE: EARTHQUAKES. It contains: earthquakes, energy and epicentre, measuring the power, effects of an earthquake, factors affecting the impact, earthquakes and volcanoes in LEDC and MEDC. Kobe 1995, Kashmir 2005.
The disasters that are existing or occurring in outer space beyond a planet, especially away from the planet Earth are called as extra terrestrial or extra planetary disasters.
Geologically active faults within 50 to 500km distance from Dhaka. Dhaka is among the 20 major world cities that are the greatest risk from earthquakes. Some of these earthquakes especially the 1762, 1812, 1865, 1885 and 1897 happened in Dhaka. If 7-8 grade in Richter Scale earthquake happen in Dhaka 70-80 percent concrete structures would just collapse and 30,00,000 peoples will die.
What is earthquakes? What is the Elastic Rebound Theory?
Seismographs record earthquake events. Where Do Earthquakes Occur and How Often? What are the Destructive Effects of Earthquakes? How are the Size and Strength of an Earthquake Measured? Can Earthquakes be Predicted? Can Earthquakes be Controlled?
GEOGRAPHY IGCSE: EARTHQUAKES. It contains: earthquakes, energy and epicentre, measuring the power, effects of an earthquake, factors affecting the impact, earthquakes and volcanoes in LEDC and MEDC. Kobe 1995, Kashmir 2005.
The disasters that are existing or occurring in outer space beyond a planet, especially away from the planet Earth are called as extra terrestrial or extra planetary disasters.
Geologically active faults within 50 to 500km distance from Dhaka. Dhaka is among the 20 major world cities that are the greatest risk from earthquakes. Some of these earthquakes especially the 1762, 1812, 1865, 1885 and 1897 happened in Dhaka. If 7-8 grade in Richter Scale earthquake happen in Dhaka 70-80 percent concrete structures would just collapse and 30,00,000 peoples will die.
An earthquake is a violent and abrupt shaking of the ground, caused by movement between tectonic plates along a fault line in the earth's crust. Earthquakes can result in the ground shaking, soil liquefaction, landslides, fissures, avalanches, fires and tsunamis.
How do you describe an earthquake?
A large earthquake far away will feel like a gentle bump followed several seconds later by stronger rolling shaking that may feel like sharp shaking for a little while. A small earthquake nearby will feel like a small sharp jolt followed by a few stronger sharp shakes that pass quickly.
Civil Engineering
Earth Quake Data
Earth Layers
Plate Tectonics
Seismic Waves
Effects of Earthquake
Epicenter of Earthquake
Damages by Earthquake
Earthquakes are natural phenomena caused by the sudden release of energy in the Earth's crust, resulting in seismic waves that propagate through the ground. These seismic waves can cause the ground to shake, leading to potentially destructive consequences. Here's a breakdown of key elements related to earthquakes:
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5. Classification of earthquakes on the basis of depth of focus:
Shallow focus Earthquake: If Focus Depth = 0 -70 Km.
Intermediate focus Earthquake: If Focus Depth = 70 -300 Km.
Deep focus Earthquake: If Focus Depth = 300 -700 Km.
7. Types of earthquakes
1 ……..Tectonic Earthquakes
2 .…….Non Tectonic Earthquakes
i ………Volcanic Earthquakes
ii ………Impact Earthquakes
8. Tectonic Earthquakes
Includes all earthquakes resulting from deformation of rocks during mountain
building.
Majority of earthquakes are of tectonic earthquakes because these results due
to flow of accumulated energy (over long period of time).
These are important
Scientifically---- to study the internal structure of the Earth
Socially----------- due to their tremendous effects on human beings.
Tectonic Earthquakes are caused by
!.............. Elastic Rebound
!.............. Sudden shearing during Plastic flow
!.............. Folding
12. •Folding:
When folding takes place, the sudden tensional cracking and
crushing results, due to which stored up energy releases, in the
form of waves. Since such cracks are usually small, i.e. why the
earthquake caused is minor in size.
13. •Sudden Shearing during plastic flow:
Only lithosphere has the strength and the brittle behavior to
fracture in an Earthquake.
Deep within the earth rocks are thought to be plastic. When
elastic limit is exceeded rocks do not always break, rather
they flow. Non elastic movement in which rocks do not part
(faulted) is called plastic flow.
So during plastic flow rocks may take on a permanent
change of shape in addition to its elastic deformation without
parting anywhere, releasing stored up energy in the form of
waves.
14.
15. •Non Tectonic Earthquakes
•Volcanic Earthquakes
It has long been known that Earthquakes are accompanied the
eruption of volcanoes. The movement of magma and gases
within earth especially the spasmodic movement is another
means of shocks.
Shocks may occur before volcanic activity.
A greater number of shocks follow an eruption due to
readjustment within magma and surrounding rocks.
Shocks due to volcanic activity are less sever and destructive
and are upto magnitude of 6.
16. During volcanic activity the shocks can be caused in various ways,
e.g.
•High pressure eruption from a smaller vent.
•Falling of volcanic lava on earth
•Stopping of flow of magma during activity.
•Stoping in magma chamber.
•Crystallization in magma.
•Tensional cracking during cooling of lava.
17. •Impact Earthquakes
This cause of earthquake is on the surface of the earth and is not
due to any inside reason. Earthquakes are lesser in size but some
times are of medium sized. Rare these are lager in size, however
depends upon the size of impacting material.
18. Impact earthquakes are caused in different ways:
•Surface Explosion up to magnitude 5.
•Meteorite Falling smaller magnitude sometimes medium sized.
•Cave ins
•Land slides