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6.9–7.5 VII–IX 40 Moderate Stover & Coffman 1993 uses various seismic scales. ... California earthquake forecast; Field Act; Geography of California;
The largest recorded megathrust earthquake was the 1960 Valdivia earthquake, estimated between magnitudes 9.4–9.6, centered off the coast of Chile along the Peru-Chile Trench, where the Nazca plate subducts under the South American plate. [26]
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).
In this area the M L scale gives anomalous results for earthquakes which by other measures seemed equivalent to quakes in California. Nuttli resolved this by measuring the amplitude of short-period (~1 sec.) Lg waves, [ 35 ] a complex form of the Love wave which, although a surface wave, he found provided a result more closely related to the mb ...
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 ...
The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or strength of an earthquake – an event occurring at greater or lesser depth. (The "M w" scale is ...
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 ...
The list incorporates high-quality earthquake source (i.e., origin time, location and earthquake magnitude) and fatality information from several sources. 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.