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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 "M w" scale is ...
Seismic intensity scales categorize the intensity or severity of ground shaking (quaking) at a given location, such as resulting from an earthquake. They are distinguished from seismic magnitude scales , which measure the magnitude or overall strength of an earthquake, which may, or perhaps may not, cause perceptible shaking.
The first, six-level intensity scale was proposed by Egen in 1828 for an earthquake in Rhineland. [ 4 ] [ 5 ] Robert Mallet coined the term "isoseismal" and produced a map for the 1857 Basilicata earthquake with a three-fold intensity scale and used this and other information to identify the epicentral area (a term he also coined). [ 6 ]
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Many earthquake magnitude scales have been developed or proposed, with some never gaining broad acceptance and remaining only as obscure references in historical catalogs of earthquakes. Other scales have been used without a definite name, often referred to as "the method of Smith (1965)" (or similar language), with the authors often revising ...
Central Weather Administration seismic intensity scale [1] [2] [3] Intensity (震度分級) Strong Ground Acceleration (cm/s 2,gal) Ground Speed (cm/s) Effects on People Effects Indoors Effects Outdoors; 0 Micro (無感) below 0.8 gal Not felt. 1 Very minor (微震) 0.8-2.5 gal Felt only by a few people at rest, vibrates slightly. 2 Minor ...
The 1893 Malatya earthquake occurred at 02:30 local time on 3 March in Malatya, Eastern Anatolia Region of Turkey. It had a surface wave magnitude of 7.1 and maximum felt intensity of X (Extreme) on the Mercalli intensity scale. This destructive earthquake caused 885 deaths and 164 injuries.
ShakeMap for the 2001 Nisqually earthquake. In seismology, strong ground motion is the strong earthquake shaking that occurs close to (less than about 50 km from) a causative fault.