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  2. What causes earthquakes? The science behind why seismic ... - AOL

    www.aol.com/causes-earthquakes-science-behind...

    Earthquakes occur when the plates that make up the Earth's crust move around. These plates, called tectonic plates, can push against each other. ... Earthquakes occur when two plates suddenly slip ...

  3. Earthquake - Wikipedia

    en.wikipedia.org/wiki/Earthquake

    In its most general sense, the word earthquake is used to describe any seismic event that generates seismic waves. Earthquakes can occur naturally or be induced by human activities, such as mining, fracking, and nuclear tests. The initial point of rupture is called the hypocenter or focus, while the ground level directly above it is the epicenter.

  4. Seismic wave - Wikipedia

    en.wikipedia.org/wiki/Seismic_wave

    The path that a wave takes between the focus and the observation point is often drawn as a ray diagram. Each path is denoted by a set of letters that describe the trajectory and phase through the Earth. In general, an upper case denotes a transmitted wave and a lower case denotes a reflected wave. The two exceptions to this seem to be "g" and "n".

  5. Earthquake cycle - Wikipedia

    en.wikipedia.org/wiki/Earthquake_Cycle

    The earthquake cycle refers to the phenomenon that earthquakes repeatedly occur on the same fault as the result of continual stress accumulation and periodic stress release. [ 1 ] [ 2 ] Earthquake cycles can occur on a variety of faults including subduction zones and continental faults.

  6. Earthquakes happen all the time, you just can't feel them. A ...

    www.aol.com/earthquakes-happen-time-just-cant...

    About 55 earthquakes a day – 20,000 a year – are recorded by the National Earthquake Information Center.Most are tiny and barely noticed by people living where they happen. But some are strong ...

  7. Why do earthquakes happen? - AOL

    www.aol.com/causes-earthquake-natural-disaster...

    Movement of tectonic plates against each other sends seismic waves rippling across earth’s surface. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways ...

  8. Fault (geology) - Wikipedia

    en.wikipedia.org/wiki/Fault_(geology)

    This results in the hanging wall flat (or a portion thereof) lying atop the foot wall ramp as shown in the fault-bend fold diagram. Thrust faults form nappes and klippen in the large thrust belts. Subduction zones are a special class of thrusts that form the largest faults on Earth and give rise to the largest earthquakes.

  9. Elastic-rebound theory - Wikipedia

    en.wikipedia.org/wiki/Elastic-rebound_theory

    In geology, the elastic-rebound theory is an explanation for how energy is released during an earthquake. As the Earth's crust deforms, the rocks which span the opposing sides of a fault are subjected to shear stress. Slowly they deform, until their internal rigidity is exceeded.