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what is earthquake ??
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Answer:
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Earthquake is a sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.”
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Answer:
An earthquake is the sudden movement of the Earth's tectonic plates, resulting in shaking of the ground. This shaking can result in the damage of various structures such as buildings and further breakdown of the Earth's surface.The study of earthquakes is called seismology.Earthquakes are usually quite brief, but there may be many over a short time frame. The sudden release of tension in the tectonic plates sends waves of energy that travel through the Earth. Seismology studies the cause, frequency, type and size of earthquakes.
There are large earthquakes and small earthquakes. Large earthquakes can take down buildings and cause death and injury. Earthquakes are measured using observations from seismographs. The magnitude of an earthquake and the intensity of shaking is usually reported on the Richter scale. The Richter Scale was invented by Charles Francis Richter in 1935. On the scale, 2 is scarcely noticeable, and magnitude 5 (or more) causes damage over a wide area.
An earthquake under the ocean can cause a tsunami, which can cause just as much destruction as the earthquake itself in mountainous areas. Earthquakes can also cause landslides. Earthquakes are part of the Earth's natural rock cycle. The impact of an earthquake can be measured by a seismometer. It detects the vibrations caused and it puts these movements on a seismograph. The strength, or magnitude, of an earthquake, is measured using the Richter scale. The Richter scale is numbered 0-9. The largest earthquake ever measured was a 9.5 on the scale a 10 has never been recorded.
Scientists cannot predict an earthquake before it happens. But we do know where earthquakes might happen in the future, like close to fault lines.An earthquake under the ocean can cause a tsunami, this can cause just as much destruction as the earthquake itself.
history
Earthquakes sometimes hit cities and kill hundreds or thousands of people. Most earthquakes happen along the Pacific Ring of Fire but the biggest ones mostly happen in other places. Tectonically active places are places where earthquakes or volcanic eruptions are quite frequent.
Causes of an earthquake
Earthquakes are caused by tectonic movements in the Earth's crust. The main cause is when tectonic plates ride one over the other, causing orogeny (mountain building), and severe earthquakes.
The boundaries between moving plates form the largest fault surfaces on Earth. When they stick, motion between the plates leads to increasing stress. This continues until the stress rises and breaks, suddenly allowing sliding over the locked portion of the fault. This releases the stored energy as shock waves. The San Andreas fault in San Francisco, and Rift valley fault in Africa are faults like this.
1. Volcanic Earthquakes : Earthquakes which are caused by volcanic eruptions are quite devastating. However, these are confined to areas of active volcanoes.
2. Collapse Earthquakes : In areas of intense mining activity, often the roofs of underground mines collapse and minor tremors take place. These are called collapse earthquakes.
Explanation:
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