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The Tyrrhenian Sea west of Italy is host to a large number of deep-focus earthquakes as deep as 520 kilometres (320 mi) below the surface. [16] However, very few earthquakes occur in the region less than 100 kilometres (62 mi) deep, the majority originating from a depth of around 250–300 kilometres (160–190 mi).
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]
Shallow earthquakes cause more damage than intermediate- and deep-focus ones since the energy generated by the shallow events is released closer to the surface and therefore produces stronger shaking than is produced by quakes that are deeper within the Earth. [1] [12] The peak ground acceleration generated was 993 gal (1.01 g). [13]
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]
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A primary example of this is located along Japan's largest island of Honshu, where the Wadati–Benioff zone is characterized by two well-defined lines of earthquake foci, with a distance between each line of 30–40 kilometers. [11] A study of the global prevalence of double Benioff zones has found that they are common in subduction zones ...
Footage and Images From 7.0 and 5.8 Earthquakes in Alaska. For premium support please call: 800-290-4726 more ways to reach us
Detailed satellite images give a bird’s-eye view Turkish towns before and after the earthquakes hit, and of relief efforts. Satellite images show shocking destruction caused by Turkey ...