Magnitude
It is desirable to have a scale for rating an earthquake in term of its energy, i.e., magnitude
Richter (1935; see Richter 1958) first proposed a magnitude scale bases solely on amplitudes of ground motion recored by a seismograph.
He defined local magnitude as:
Where a is the maximum amplitude in millimetres recorded on a wood-Anderson seismograph for an earthquake at an epicentral distance of ........................ is the maximum amplitude at km for a standard earthquake (see Kayal 2008).
The local magnitude is thus a number characteristic of the earthquake , and independent of the location of the recording station.
based on this, Richter developed a monogram to estimate local magnitude, named M.
This scale is still popular, but with the advent of digital recording systems, various scales based on theoretical considerations are now being used.
In particular, the moment magnitude scale is widely use, as this scale is stable even for higher magnitude earthquake (7.0 and above), where M becomes saturated.
In addition, body wave magnitude and surface wave magnitude scales are also used in international earthquake cata logues, such as those of the international seismological Centre (ISC) and the US Geological Suevey.
MagnitudeIt is desirable to have a scale for rating an earthquake in term of its energy, i.e., magnitudeRichter (1935; see Richter 1958) first proposed a magnitude scale bases solely on amplitudes of ground motion recored by a seismograph.He defined local magnitude as: Where a is the maximum amplitude in millimetres recorded on a wood-Anderson seismograph for an earthquake at an epicentral distance of ........................ is the maximum amplitude at km for a standard earthquake (see Kayal 2008).The local magnitude is thus a number characteristic of the earthquake , and independent of the location of the recording station.based on this, Richter developed a monogram to estimate local magnitude, named M.This scale is still popular, but with the advent of digital recording systems, various scales based on theoretical considerations are now being used.In particular, the moment magnitude scale is widely use, as this scale is stable even for higher magnitude earthquake (7.0 and above), where M becomes saturated.In addition, body wave magnitude and surface wave magnitude scales are also used in international earthquake cata logues, such as those of the international seismological Centre (ISC) and the US Geological Suevey.
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