What is an earthquake Class 9?
An earthquake is the shaking of the surface of Earth due to the sudden release of energy in the Earth’s crust, as a result, seismic waves (also known as S waves)are created.
What is earthquake and its causes?
An earthquake is caused by a sudden slip on a fault. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth’s crust and cause the shaking that we feel. In California there are two plates – the Pacific Plate and the North American Plate.
How do earthquakes affect the environment and human life?
A powerful earthquake can destroy buildings, factories, shops, roads, bridges and schools. These cause many people to become homeless. Furthermore, earthquakes can cause disruption to public services like transport systems and communication connections.
How do earthquake affect humans?
Emergency types 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.
What are the economic impacts of earthquakes?
Effects of an earthquake
| Social impacts | Economic impacts | |
|---|---|---|
| Long-term impacts | Disease may spread. People may have to be re-housed, sometimes in refugee camps. | The cost of rebuilding a settlement is high. Investment in the area may be focused only on repairing the damage caused by the earthquake. Income could be lost. |
What happens after the earthquake?
Aftershocks, landslides and other earth movement can cause items to shift, fires to start, tsunamis to form, and more. Even a minor earthquake can cause pipes to snap and objects inside your home to shift. Find current information after an earthquake from the USGS Hazard Program.
Why is it important to prepare for an earthquake?
Being prepared can reduce the fear, anxiety and losses that accompany disasters. Communities, families, and individuals should know what to do in the event of an earthquake and where to seek shelter during a fire. Each disaster has lasting effects, both to people and property.
Is a magnitude 10 earthquake possible?
No, earthquakes of magnitude 10 or larger cannot happen. The magnitude of an earthquake is related to the length of the fault on which it occurs. The largest earthquake ever recorded was a magnitude 9.5 on May 22, 1960 in Chile on a fault that is almost 1,000 miles long…a “megaquake” in its own right.
When was last magnitude 10 earthquake?
No magnitude 10 earthquake has ever been observed. The most powerful quake ever recorded was a magnitude 9.5 temblor in Chile in 1960. A magnitude 10 quake would likely cause ground motions for up to an hour, with tsunami hitting while the shaking was still going on, according to the research.
Can you feel a 2.0 earthquake?
Normally, earthquakes below magnitude 3 or so are rarely felt. However, smaller quakes from magnitude 2.0 can be felt by people if the quake is shallow (few kilometers only) and if people are very close to its epicenter and not disturbed by ambient factors such as noise, wind, vibrations of engines, traffic etc.
How does an earthquake feel?
A large earthquake nearby will feel like a sudden large jolt followed quickly by more strong shaking that may last a few seconds or up to a couple of minutes if it’s a rare great event. The shaking will feel violent and it will be difficult to stand up.
How strong is a magnitude 3 earthquake?
| Class | Magnitude |
|---|---|
| Strong | 6 – 6.9 |
| Moderate | 5 – 5.9 |
| Light | 4 – 4.9 |
| Minor | 3 -3.9 |