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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]
Earthquakes. 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.
v. t. e. Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at a given location. Magnitudes are usually determined from measurements of an earthquake's ...
Earthquake shaking table at the National Technical University, Athens, Greece. There are several different experimental techniques that can be used to test the response of structures and soil or rock slopes to verify their seismic performance , one of which is the use of an earthquake shaking table (a shaking table , or simply shake table ).
After the 1989 earthquake damaged that facility, artists founded the Luggage Store Gallery at 1007 Market, at the intersection of 6th Street, Market, Taylor and Golden Gate Avenue. In 1989 the Tenderloin Reflection and Education Center (TREC) spun off from St Anthony foundation and operated a cultural center including dance, music, writing ...
Earthquakes. The moment magnitude scale ( MMS; denoted explicitly with M or Mw or Mwg, and generally implied with use of a single M for magnitude [1]) is a measure of an earthquake 's magnitude ("size" or strength) based on its seismic moment. Mw was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori.
Seismic base isolation, also known as base isolation, [ 3] or base isolation system, [ 4] is one of the most popular means of protecting a structure against earthquake forces. [ 5] It is a collection of structural elements which should substantially decouple a superstructure from its substructure that is in turn resting on the shaking ground ...
In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, of which PGA is a measure, rather than the magnitude of the earthquake itself. For moderate earthquakes, PGA is a reasonably good determinant of damage; in severe earthquakes, damage is more often correlated with peak ground velocity. [3]
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