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In today’s class, we will be talking about earthquake. Enjoy the class!
An earthquake is a sudden shaking of the earth’s surface, which may be violent enough to cause great damage. This is due to a sudden and rapid displacement of crustal rocks beneath the earth’s surface. It occurs as a result of disturbances or movement within and below the earth crusts.
Origin or Focus: This is the point where an earthquake originates i.e. the shock waves are set out from this point.
Epicentre: This is the point on the earth’s surface directly on top of the origin where the effect of the earthquake is greatest.
Seismograph: This is the instrument used to measure the intensity of the earthquake.
Richter scale: This is the scale that indicates the point of an earthquake or the magnitude of the shock.
- Define an earthquake.
- Explain the origin of an earthquake.
Effects of earthquake
- They are disastrous and destructive to life and property.
- They destroy roads, railways, bridges, power line and telecommunication lines.
- They can cause and create large openings on lands.
- They can raise and lower sea levels.
- They also displace parts of the earth’s crust either vertically or laterally.
- They can also raise or lower parts of the ocean floor.
- They can cause landslides and open up deep cracks in surface rocks.
- What are the causes of earthquakes?
- Explain focus, epicentre and seismograph.
- List four effects of an earthquake.
- Differentiate between weather and climate.
- State five elements of climate.
Essential Geography, Pages33-34.
- The intensity of an earthquake is measured with (a) Seismograph(b) Ritcher’s scale (c) Campbell stoke (d) Barometer
- The point an earthquake first appears directly above the surface is called(a) Epicentre (b) Focus (c) Origin (d) Core
- The point at which the earthquake first began is called(a) Focus (b) Epicentre (c) Vent (d) Lithosphere
- Earth tremor is simply the _______ of the earth crust (a) folding (b) shaking (c) weathering (d) formation
- The magnitude of the earthquake is measured by ______ (a) Seismograph (b) Ritcher’s scale (c) Campbell stoke (d) Barometer
- State two causes of earthquake.
- Outline three effects of an earthquake.
In our next class, we will be talking about Volcanicity. We hope you enjoyed the class.
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