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An earthquake is a seismic event caused by the sudden release of energy in Earth’s lithosphere, usually through fault rupture.
An earthquake is the shaking of Earth’s surface caused by a sudden release of energy in the lithosphere, producing seismic waves. Most earthquakes result from the rupture and movement of geological faults, although volcanic activity, landslides, mining, hydraulic fracturing, and explosions can also generate seismic events. The initial rupture point is the hypocenter, or focus, while the point directly above it on the surface is the epicenter. Earthquakes vary from imperceptible tremors to destructive events capable of damaging infrastructure, triggering landslides, causing soil liquefaction, and generating tsunamis when large offshore earthquakes displace the seabed. Seismicity describes the frequency, types, and sizes of earthquakes in a region over a given period, while seismicity at a specific location can also mean the average rate of seismic energy released per unit volume. Earthquakes occur most frequently near tectonic plate boundaries, especially around the Pacific Ring of Fire, where stress accumulates along normal, reverse or thrust, and strike-slip faults. According to the elastic-rebound theory, tectonic motion gradually stores strain energy until frictional resistance is overcome, causing sudden fault slip and energy release. Earthquake sequences may include foreshocks, mainshocks, aftershocks, or swarms, and approximately 500,000 earthquakes are detected worldwide each year, although only about 100,000 are generally felt.
An earthquake is a seismic event caused by the sudden release of energy in Earth’s lithosphere, usually through fault rupture.
The hypocenter is the underground point where rupture begins, and the epicenter is the surface point directly above it.
Seismicity refers to the frequency, type, size, and average seismic energy release of earthquakes in a region.
Earthquakes are concentrated near tectonic plate boundaries, particularly the Pacific Ring of Fire.
Normal, reverse or thrust, and strike-slip faults are the principal fault types associated with tectonic earthquakes.
Earthquake effects can include ground shaking, soil liquefaction, landslides, structural damage, loss of life, and tsunamis.
The shaking of Earth’s surface caused by a sudden release of energy that generates seismic waves.
The frequency, type, and size of earthquakes occurring in a particular area over a specified time.
The underground point or focus where an earthquake rupture initially begins.
The point on Earth’s surface located directly above an earthquake’s hypocenter.
The rigid outer layer of Earth in which earthquake-generating strain and ruptures occur.
The theory that stress accumulates in rocks until a fault suddenly slips and releases stored elastic energy.
A fracture or zone of fractures in Earth’s crust along which blocks of rock move relative to each other.
Waves of energy released by an earthquake that travel through Earth and along its surface.
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