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  2. Hypocenter - Wikipedia

    en.wikipedia.org/wiki/Hypocenter

    Hypocenter (Focus) and epicenter of an earthquake. An earthquake's hypocenter or focus is the position where the strain energy stored in the rock is first released, marking the point where the fault begins to rupture. [3] This occurs directly beneath the epicenter, at a distance known as the hypocentral depth or focal depth. [3]

  3. Depth of focus (tectonics) - Wikipedia

    en.wikipedia.org/wiki/Depth_of_focus_(tectonics)

    In seismology, the depth of focus or focal depth is the depth at which an earthquake occurs. Earthquakes occurring at a depth of less than 70 km (43 mi) are classified as shallow-focus earthquakes, while those with a focal depth between 70 km (43 mi) and 300 km (190 mi) are commonly termed mid-focus or intermediate-depth earthquakes. [1]

  4. Epicenter - Wikipedia

    en.wikipedia.org/wiki/Epicenter

    The magnitude of an earthquake is related to the total area of its fault rupture. [8] Most earthquakes are small, with rupture dimensions less than the depth of the focus so the rupture doesn't break the surface, but in high magnitude, destructive earthquakes, surface breaks are common. [8]

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

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

    What does magnitude mean in an earthquake? Magnitude is a measurement of the strength of an earthquake. Officially it's called the moment magnitude scale. It's a logarithmic scale, meaning each ...

  6. Earthquake - Wikipedia

    en.wikipedia.org/wiki/Earthquake

    The initial point of rupture is called the hypocenter or focus, while the ground level directly above it is the epicenter. Earthquakes are primarily caused by geological faults, but also by volcanic activity, landslides, and other seismic events. The frequency, type, and size of earthquakes in an area define its seismic activity, reflecting the ...

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

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

    Moderately damaging earthquakes strike between New York and Wilmington, Delaware, about twice a century, the USGS said, and smaller earthquakes are felt in the region roughly every two to three years.

  8. Focal mechanism - Wikipedia

    en.wikipedia.org/wiki/Focal_mechanism

    The data for an earthquake is plotted using a lower-hemisphere stereographic projection. The azimuth and take-off angle are used to plot the position of an individual seismic record. The take-off angle is the angle from the vertical of a seismic ray as it emerges from the earthquake focus.

  9. Deep-focus earthquake - Wikipedia

    en.wikipedia.org/wiki/Deep-focus_earthquake

    A deep-focus earthquake in seismology (also called a plutonic earthquake) is an earthquake with a hypocenter depth exceeding 300 km. They occur almost exclusively at convergent boundaries in association with subducted oceanic lithosphere .