The moment

**magnitude**scale –**Mw**or**M w**– developed by Kanamori (1977), is based on an earthquake's seismic moment, M 0, a measure of how much work an earthquake does in sliding one patch of rock past another patch of rock.Moment

**magnitude**scale. The moment**magnitude**scale ( MMS; denoted explicitly with**Mw**or**Mw**, 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. It was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori.e. The Modified Mercalli intensity scale ( MM, MMI, or MCS ), developed from Giuseppe Mercalli 's Mercalli intensity scale of 1902, is a

**seismic**intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the effects of an earthquake at a given location, distinguished from the earthquake's inherent force ...Seismic

**magnitude****scales**. 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. This short article about science can be made longer.Like many other intensity

**scales**, ESI 2007 uses the basic structure of twelve degrees of seismic intensity and is designed for application during field surveys immediately after the seismic event. However, the definitions of intensity degrees in ESI 2007 are based on the observation of distribution and size of environmental effects produced by ...Each is valid for a particular frequency range and type of seismic signal. In its range of validity, each is equivalent to the Richter

**magnitude**. Because of the limitations of all three**magnitude****scales**(ML, Mb, and Ms), a new more uniformly applicable extension of the**magnitude**scale, known as moment**magnitude**, or**Mw**, was developed. In ...