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Megathrust earthquakes occur at convergent plate boundaries, where one tectonic plate is forced underneath another. 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.
The 1971 San Fernando earthquake (also known as the 1971 Sylmar earthquake) occurred in the early morning of February 9 in the foothills of the San Gabriel Mountains in southern California. The unanticipated thrust earthquake had a magnitude of 6.5 on the M s scale and 6.6 on the M w scale, and a maximum Mercalli intensity of XI (Extreme).
Earthquake locations are taken from the Centennial Catalog [1] and the updated Engdahl, van der Hilst and Buland earthquake catalog, [2] which is complete to December 2005. From January 2006, earthquake locations are from the United States Geological Survey's Preliminary Determination of Epicenters (PDE) [3] monthly listing.
Earthquakes in the New Madrid and Wabash Valley seismic zones from 1974 to 2002, with magnitudes larger than 2.5. The zone had four of the largest earthquakes in recorded North American history, with moment magnitudes estimated to be as large as 7 or greater, all occurring within a 3-month period between December 1811 and February 1812. Many of ...
A magnitude 6.2 earthquake struck the South Sandwich Islands on March 8 at a depth of 10.0 km (6.2 mi). A magnitude 6.0 earthquake struck Sergeyevka, Primorsky Krai, Russia [10] on March 9 at a depth of 441.2 km (274.1 mi). A magnitude 6.0 earthquake struck The Gulf of California on March 13 at a depth of 26.1 km (16.2 mi).
The 2011 Tohoku earthquake was the largest earthquake ever recorded in Japan, and is the fourth largest earthquake in recorded history, a tsunami up to 40.5 m (133 ft) high caused 19,745 deaths with 6,242 people injured, and 2,556 people missing.
In most states, all electors vote with the state’s popular opinion. If 51 percent of voters in California choose Hillary Clinton, all 55 of California’s electors will vote for Clinton — and none will vote for Donald Trump. (Historically, a few so-called faithless electors have voted against popular opinion. They never changed the outcome ...
A magnitude 6.7 earthquake struck Chile, near Valparaíso, on April 17, at a depth of 37 km. [51] One person died of a heart attack and another due to the loss of power at a local hospital. [citation needed] A magnitude 6.8 earthquake struck Papua New Guinea, about 137 km north of Lae, on April 17 at a depth of 208.2 km. [52]