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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 and 300 km (43 and 186 mi) are commonly termed "mid-focus" or "intermediate-depth" earthquakes.
Earthquakes are common on the West Coast, with multiple plate boundaries like the San Andreas fault making geologic activity more likely. They are rarer on the East Coast, but they do happen ...
A type of seismic zone is a Wadati–Benioff zone which corresponds with the down-going slab in a subduction zone. [2] The world's greatest seismic belt, known as the Circum-Pacific seismic belt, [3] is where a majority of the Earth's quakes occur.
Earthquakes are common along convergent boundaries. A region of high earthquake activity, the Wadati–Benioff zone, generally dips 45° and marks the subducting plate. Earthquakes will occur to a depth of 670 km (416 mi) along the Wadati-Benioff margin. [citation needed] Both compressional and extensional forces act along convergent boundaries.
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] Fault ruptures in large earthquakes can extend for more than 100 km (62 mi). [8]
East Coast residents were jolted Friday by a 4.8-magnitude earthquake centered near Lebanon, New Jersey, with weak rumblings felt as far away as Baltimore and the Massachusetts-New Hampshire border.
Since March 5, 11 earthquakes have occurred in the commonwealth, with ten below a 2.0 magnitude. The most recent earthquake over a 3.0 magnitude was on May 29, 2023 near Calhoun in McLean County.
Earthquakes frequently occur in the region at depths of up to 670 kilometres (420 mi) beneath the surface. [13] Several large earthquakes have taken place here, including the M w 8.2 1994 Bolivia earthquake (631 km deep), the M w 8.0 1970 Colombia earthquake (645 km deep), and M w 7.9 1922 Peru earthquake (475 km deep).