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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.
That gave the Mercalli Scale, as well as the European MSK-64 scale that followed, a quantitative element representing the vulnerability of the building's type. [10] Since then, that scale has been called the Modified Mercalli intensity scale (MMS) and the evaluations of the seismic intensities are more reliable.
The Modified Mercalli Intensity scale shows how intense an earthquake is at a specific site, based on what people on the ground would feel. The scale is expressed in Roman numerals. I – Not Felt ...
The second, now known as the Mercalli intensity scale, had ten degrees, and elaborated the descriptions in the Rossi–Forel scale. [4] The Mercalli intensity scale is, in modified form, still used. [5] Unlike the Richter scale, which measures the energy released by an earthquake, the Mercalli intensity scale measures the effects of an
The Mercalli intensity scale uses personal reports and observations to measure earthquake intensity but PGA is measured by instruments, such as accelerographs. It can be correlated to macroseismic intensities on the Mercalli scale [3] but these correlations are associated with large uncertainty. [4] [5]
"Moderate" and "light" shaking, as defined by the Modified Mercalli Intensity Scale, was felt in parts of Malibu, Thousand Oaks, Agoura Hills, Calabasas and Westlake Village. Moderate shaking is ...
The earthquake was assigned a maximum Modified Mercalli intensity of X (Extreme). Shaking was felt across much of Alaska and parts of western Yukon and British Columbia in Canada. [8] The Alaska earthquake was a subduction zone (megathrust) earthquake, caused by an oceanic plate sinking under a continental plate.
Only "weak" shaking was felt in parts of Malibu on Saturday, according to the U.S. Geological Survey, as defined by the Modified Mercalli Intensity Scale. "Weak" shaking is generally defined as ...