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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.
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
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 largest shock measured 5.5 on the moment magnitude scale, with five others of magnitude 5+. [2] The maximum perceived intensity was X ( Extreme ) on the Mercalli intensity scale . The earthquake sequence, centred between the towns of Gibellina , Salaparuta and Poggioreale , killed at least 231 people, possibly more than 400, with between ...
With the exception of poor building sites, the zone of Mercalli scales intensities of VII or more all lay west of the Andes in a strip running from Lota (37° S) southwards. The area of intensities of VII or more did not penetrate into the Central Valley north of Lleulleu Lake (38° S) and south of Castro (42.5° S). [22]
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 maximum intensities are based on the Modified Mercalli intensity scale. Earthquake magnitudes are based on data from the USGS. Compared to other years Number of ...
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 ...