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Damaging earthquakes are well known in the Pacific Northwest, including several larger than magnitude 7, most notably the M9 1700 Cascadia earthquake and the M7.0–7.3 earthquake in about 900AD on the Seattle Fault. The M6.5 1965 Puget Sound earthquake shook the Seattle, Washington, area, causing substantial damage and seven deaths. This event ...
[26] [6] Meanwhile, the Earthquake Research Committee from the Japanese government said the earthquake ruptured along a 45 km-long, north–south striking fault that dips towards the east. [27] According to the US Geological Survey , the earthquake struck at a depth of 44.0 km (27.3 mi), while the JMA placed its depth at 55 km (34 mi).
On 2 November, approximately 400 earthquakes were recorded, with the largest being magnitude 2.8, continuing the seismic trend. By 3 November, a magnitude 4.3 earthquake occurred, and the area continued to experience significant seismic activity, though there were no signs of magma moving toward the surface.
The earthquake's shallow depth and proximity to Folkestone resulted in structural damage in the town, and one woman suffered a minor head and neck injury. [5] Following the earthquake, a total of 474 properties were reported as damaged, with 73 properties too badly damaged for people to return to, 94 seriously damaged, and 307 suffering from minor structural damage. [6]
The earthquake was initially reported as a 7.3 magnitude by Japan Meteorological Agency, and was later revised to 7.4, while the United States Geological Survey and GFZ Potsdam determined a magnitude of 6.9. There were no deaths as a result of the earthquake, however seventeen people were injured; three of which were in critical condition. [2]
The 1949 Olympia earthquake was a damaging magnitude 6.7 intraslab earthquake that occurred at 52 km depth and caused eight deaths. Another notable intraslab earthquake in the Puget Sound region was the magnitude 6.8 2001 Nisqually earthquake. Intraslab earthquakes in Cascadia occur in areas where the subducting plate has high curvature. [13]
An earthquake, measuring 6.2 ± 0.016 [3] on the moment magnitude scale, hit Central Italy on 24 August 2016 at 03:36:32 CEST (01:36 UTC).Its epicentre was close to Accumoli, with its hypocentre at a depth of 4 ± 1 km, [1] approximately 75 km (47 mi) southeast of Perugia and 45 km (28 mi) north of L'Aquila, in an area near the borders of the Umbria, Lazio, Abruzzo and Marche regions.
In its most general sense, the word earthquake is used to describe any seismic event that generates seismic waves. Earthquakes can occur naturally or be induced by human activities, such as mining, fracking, and nuclear tests. The initial point of rupture is called the hypocenter or focus, while the ground level directly above it is the epicenter.