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The earthquakes are caused by slip along the thrust fault that forms the contact between the two plates. These interplate earthquakes are the planet's most powerful, with moment magnitudes (M w) that can exceed 9.0. [1] [2] Since 1900, all earthquakes of magnitude 9.0 or greater have been megathrust earthquakes. [3]
M w [59] Doublet earthquake rupturing an outer rise normal fault and the megathrust. [60] 2009 Samoa earthquake and tsunami: 27 February 2010 03:34 (local time) Maule Region, Chile: 550 8.8 M w [61] Including 25 missing. 2010 Chile earthquake: 11 March 2011 14:46 (local time) Tohoku region, Japan: 22,312 9.1 M w [62] Including 2,553 missing.
For example, a magnitude 7.0 quake in Salta, Argentina, in 2011, that was 576.8 km deep, had a maximum felt intensity of V, [19] while a magnitude 2.2 event in Barrow in Furness, England, in 1865, about 1 km deep, had a maximum felt intensity of VIII. [20] The small table is a rough guide to the degrees of the MMI scale.
The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]
Note: earthquakes included for this category are quakes along subduction zones of 8.0 magnitude or greater. Subcategories This category has the following 6 subcategories, out of 6 total.
The 'MHT' is a known hazard and potential source for large earthquakes of magnitude 9.0 or greater. The MHT is also associated with other large 20th century earthquakes in 1950 (M w 8.7) and 1934 (M w 8.4). Within the last thousand years, multiple earthquakes have occurred with magnitudes of at least M w 8.0, as deduced by paleoseismology.
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Megathrust earthquakes in the United States (1 C, 2 P) Pages in category "Megathrust earthquakes in North America" The following 3 pages are in this category, out of 3 total.