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  2. 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.

  3. Focal mechanism - Wikipedia

    en.wikipedia.org/wiki/Focal_mechanism

    The moment tensor solution is displayed graphically using a so-called beachball diagram. The pattern of energy radiated during an earthquake with a single direction of motion on a single fault plane may be modelled as a double couple, which is described mathematically as a special case of a second order tensor (similar to those for stress and strain) known as the moment tensor.

  4. Earthquake - Wikipedia

    en.wikipedia.org/wiki/Earthquake

    The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. 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.

  5. Shadow zone - Wikipedia

    en.wikipedia.org/wiki/Shadow_zone

    The main observational constraint on identifying liquid layers and/or structures within the earth come from seismology. When an earthquake occurs, seismic waves radiate out spherically from the earthquake's hypocenter. [5] Two types of body waves travel through the Earth: primary seismic waves (P waves) and secondary seismic waves (S waves).

  6. Seismic wave - Wikipedia

    en.wikipedia.org/wiki/Seismic_wave

    The mode 0 T 2 describes a twisting of the northern and southern hemispheres relative to each other; it has a period of about 44 minutes. [3] The first observations of free oscillations of the Earth were done during the great 1960 earthquake in Chile. Presently the periods of thousands of modes have been observed.

  7. Why do earthquakes happen? - AOL

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

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  8. What keeps triggering earthquakes in Turkey? An expert ... - AOL

    www.aol.com/news/keeps-triggering-earthquakes...

    “The Earth, very roughly, has four major layers. From surface to the center: crust, mantle, outer and inner cores. ... As the plates move relative to each other, earthquakes happen at plate ...

  9. Megathrust earthquake - Wikipedia

    en.wikipedia.org/wiki/Megathrust_earthquake

    The Aleutian Trench, of the southern coast of Alaska and the Aleutian Islands, where the North American plate overrides the Pacific plate, has generated many major earthquakes throughout history, several of which generated Pacific-wide tsunamis, [22] including the 1964 Alaska earthquake; at magnitude 9.1–9.2, it remains the largest recorded ...