What is the definition of earthquake in geography?
An earthquake is the shaking and vibration of the Earth’s crust due to movement of the Earth’s plates (plate tectonics). The point inside the crust where the pressure is released is called the focus. The point on the Earth’s surface above the focus is called the epicentre.
What is an earthquake energy?
Earthquakes release energy in several forms: The energy in seismic waves that cause the ground to shake. Heat energy associated with friction on the fault slip surface. Gravitational potential energy (the energy stored when lifting something off the ground, for example) may change as a result of the earthquake.
What is an earthquake full definition?
An earthquake is the result of a sudden release of stored energy in the Earth’s crust that creates seismic waves. In its most generic sense, the word earthquake is used to describe any seismic event—whether a natural phenomenon or an event caused by humans—that generates seismic waves.
How would you describe an earthquake?
The shaking will feel violent and it will be difficult to stand up. The contents of your house will be a mess. 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.
What are the 5 causes of earthquake?
5 Main Causes of Earthquakes
- Volcanic Eruptions. The main cause of the earthquake is volcanic eruptions.
- Tectonic Movements. The surface of the earth consists of some plates, comprising of the upper mantle.
- Geological Faults.
- Minor Causes.
What is the impact of earthquakes on humans?
Earthquakes usually cause severe damage to urban centres, resulting in the loss of life and damage to homes and other infrastructure. Although risks are normally associated with cities, the effects on the rural sector and farming communities can be devastating.
Where is energy stored in an earthquake?
This rupture on the fault plane is called the focus and the projection of this point on the ground surface is called the epicenter. When a rupture occurs along a fault, the strain energy stored on either side of the fault is released in the form of seismic waves and heat.
Where does the energy of an earthquake come from?
1) Energy for Earthquakes comes from radioactive energy in Earth’s mantle. Radioactive decay produces heat that causes convection in the mantle. This movement is transferred to Earth’s crust where movement stores up energy in rocks, like a spring being stretched.
What words are related to earthquake?
What is the name of earthquake?
Science Center Objects
|2.||9.2||1964 Great Alaska Earthquake, Prince William Sound Earthquake, Good Friday Earthquake|
|3.||9.1||Sumatra-Andaman Islands Earthquake, 2004 Sumatra Earthquake and Tsunami, Indian Ocean Earthquake|
What are the 3 causes of earthquakes?
What are the 10 causes of earthquake?
Things that cause earthquakes
- Groundwater extraction – decrease in pore pressure.
- Groundwater – increase in pore pressure.
- Heavy rain.
- Pore fluid flow.
- High CO2 pressure.
- Building dams.
- No earthquakes (Seismic quiescence)