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The 2020 Sparta earthquake occurred in North Carolina on August 9 at 08:07 EDT. The epicenter of this relatively uncommon intraplate earthquake was near the small town of Sparta, Alleghany County. The thrust-faulting earthquake had a moment magnitude of 5.1, occurring at a shallow depth of 4.7 miles (7.6 km). Rupture occurred on the previously ...
The location and depth of this event show that it was an intraplate earthquake that occurred as a result of shallow strike-slip faulting within the Eurasian plate. The calculated focal mechanism for the event indicates that rupture occurred on a nearly vertical fault striking either to the southeast or southwest. [1]
The 1888 earthquake in Río de la Plata was an intraplate quake, [8] from reactivated faults in the Quilmes Trough, far from the boundaries of the South American plate. With a magnitude greater than 5.0 it was felt "in the cities of Buenos Aires, La Plata and other small towns and villages along the Rio de Plata coastal regions."
An earthquake with a moment magnitude of 7.0 [4] [note 1] occurred on 30 October 2020 about 14 km (8.7 mi) northeast of the Greek island of Samos.Although Samos was closest to the epicentre, it was the large Turkish city İzmir, 70 km (43 mi) northeast that was heavily affected—more than 700 residential and commercial structures were seriously damaged or destroyed.
The New Madrid seismic zone (NMSZ), sometimes called the New Madrid fault line (or fault zone or fault system), is a major seismic zone and a prolific source of intraplate earthquakes (earthquakes within a tectonic plate) in the Southern and Midwestern United States, stretching to the southwest from New Madrid, Missouri.
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Stress drop is a measure of the stress across a fault before and after an earthquake rupture. While intraplate and interplate earthquakes obey similar length proportional scaling laws, interplate earthquakes exhibit stress drop values that are systematically smaller by a factor of 6. [ 6 ]
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