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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. [11]
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
"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 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]
The estimated magnitude for the earthquake is 7.0 on the surface-wave magnitude scale. [1] It was followed by 18 months of aftershocks. [3] Intensity estimates on the Mercalli scale are: VIII–IX for Antioch; [1] [3] VII for both Daphne, a suburb of Antioch, and the port town of Seleucia Pieria.
The old Modified Mercalli intensity scale (MM), a relic of the pre-instrument days, remains useful in the sense that each intensity-level provides an observable difference in seismic damage. After many years of trying every possible manipulation of accelerometer-time histories, it turns out that the extremely simple peak ground velocity (PGV ...
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. [9] The Alaska earthquake was a subduction zone (megathrust) earthquake, caused by an oceanic plate sinking under a continental plate.