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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 (Mw) that can exceed 9.0. [1][2] Since 1900, all earthquakes of magnitude 9.0 or greater have been megathrust earthquakes. [3]
2024 Noto earthquake: 2 7.4 18 Taiwan, Hualien offshore VIII (Severe) 40.0 April 2 2024 Hualien earthquake: 2 7.4 1 Chile, Antofagasta: VII (Very strong) 117.4 July 19 - 3 7.2 0 Peru, Arequipa offshore VI (Strong) 28.0 June 28 - 4 7.1 0 Japan, Miyazaki offshore VIII (Severe) 25.0 August 8 2024 Hyūga-nada earthquake: 4 7.1 0
The 1960 Valdivia earthquake and tsunami (Spanish: Terremoto de Valdivia) or the Great Chilean earthquake (Gran terremoto de Chile) on 22 May 1960 was the most powerful earthquake ever recorded. Most studies have placed it at 9.4–9.6 on the moment magnitude scale , [ 1 ] while some studies have placed the magnitude lower than 9.4.
Peak ground acceleration (PGA) is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. PGA is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake. [1] Earthquake shaking generally occurs in all three directions.
The first, six-level intensity scale was proposed by Egen in 1828 for an earthquake in Rhineland. [4] [5] Robert Mallet coined the term "isoseismal" and produced a map for the 1857 Basilicata earthquake with a three-fold intensity scale and used this and other information to identify the epicentral area (a term he also coined). [6]
First supershear earthquake observed in an oceanic plate boundary 2015-04-24 South of Haida Gwaii: 51.62 -130.77 0 0 6.2 V 2012-11-08 West of Vancouver Island 49.23 -128.48 0 0 6.1 IV [9] 2012-10-30 Haida Gwaii: 52.37 -131.90 0 0 6.2 Aftershock of 7.8 earthquake [10] 2012-10-28 Haida Gwaii 52.67 -132.60 0 0 6.3 V Aftershock of 7.8 earthquake [11]
M w [39] Foreshock to the next earthquake on 22 May. 1960 Concepción earthquakes: 22 May 1960 15:11 (local time) Valdivia, Chile: 6,000 9.5 M w [40] The largest earthquake in recorded history. 1960 Valdivia earthquake: 13 October 1963 15:17 (local time) Kuril Islands, USSR (present-day Russia) 0 8.5 M w [41] One of the largest earthquake in ...
Millions of minor earthquakes occur every year worldwide, equating to hundreds every hour every day. [15] On the other hand, earthquakes of magnitude ≥8.0 occur about once a year, on average. [15] The largest recorded earthquake was the Great Chilean earthquake of May 22, 1960, which had a magnitude of 9.5 on the moment magnitude scale. [16]