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  2. Earthquake cycle - Wikipedia

    en.wikipedia.org/wiki/Earthquake_Cycle

    [3] [4] Depending on the size of the earthquake, an earthquake cycle can last decades, centuries, or longer. [ 1 ] [ 5 ] The Parkfield portion of the San Andreas fault is a well-known example where similarly located M6.0 earthquakes have been instrumentally recorded every 30–40 years.

  3. Tropical cyclone - Wikipedia

    en.wikipedia.org/wiki/Tropical_cyclone

    Each year on average, around 80 to 90 named tropical cyclones form around the world, of which over half develop hurricane-force winds of 65 kn (120 km/h; 75 mph) or more. [1] Worldwide, tropical cyclone activity peaks in late summer, when the difference between temperatures aloft and sea surface temperatures is the greatest.

  4. Cyclogenesis - Wikipedia

    en.wikipedia.org/wiki/Cyclogenesis

    Although the formation of tropical cyclones is the topic of extensive ongoing research and is still not fully understood, there are six main requirements for tropical cyclogenesis: sea surface temperatures that are warm enough, atmospheric instability, high humidity in lower to middle levels of the troposphere, enough Coriolis force to develop ...

  5. Cyclone - Wikipedia

    en.wikipedia.org/wiki/Cyclone

    Occluded fronts form late in the cyclone life cycle near the center of the cyclone and often wrap around the storm center. Tropical cyclogenesis describes the process of development of tropical cyclones. Tropical cyclones form due to latent heat driven by significant thunderstorm activity, and are warm core.

  6. Earthquake - Wikipedia

    en.wikipedia.org/wiki/Earthquake

    The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time. 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

  7. Tropical cyclogenesis - Wikipedia

    en.wikipedia.org/wiki/Tropical_cyclogenesis

    Depth of 26 °C isotherm on October 1, 2006. There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower to middle levels of the troposphere, enough Coriolis force to sustain a low-pressure center, a preexisting low-level focus or disturbance, and low vertical wind shear. [3]

  8. Fujiwhara effect - Wikipedia

    en.wikipedia.org/wiki/Fujiwhara_effect

    Diagram of the Fujiwhara effect, showing how 2 tropical cyclones interact with each other. [1]When cyclones are in proximity of one another, their centers will circle each other cyclonically (counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere) [2] about a point between the two systems due to their cyclonic wind circulations.

  9. Geological event - Wikipedia

    en.wikipedia.org/wiki/Geological_event

    This is a record of an earthquake (a geological event) that disturbed the strata. Geological events range in time span by orders of magnitude, from seconds to millions of years, and in spatial scale from local to regional and, ultimately, global. [2]