The effect of an earthquake on the Earth’s surface is called the intensity. The intensity scale consists of
a series of certain key responses
such as people awakening, movement of furniture, damage to chimneys, and finally – total destruction.
What are the types of intensity scale?
| Intensity Scale Shaking | I Scarcely Perceptible | II Slightly Felt | III Weak | IV Moderately Strong |
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Which scale has 12 levels of intensity?
This scale is composed of 12 increasing levels of intensity based on observed effects.
What is the scale used to measure intensity?
Although several scales have been developed over the years, the two commonly used today in the United States are the moment magnitude scale, which measures magnitude (M), or size, and
the Modified Mercalli scale
, which measures intensity.
What is the range of intensity scale of earthquake?
| Magnitude Earthquake Effects Estimated Number Each Year | 6.1 to 6.9 May cause a lot of damage in very populated areas. 100 | 7.0 to 7.9 Major earthquake. Serious damage. 10-15 | 8.0 or greater Great earthquake. Can totally destroy communities near the epicenter. One every year or two |
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What is the weakest intensity scale?
Scales. The PEIS has ten intensity scales represented in Roman numerals with
Intensity I
being the weakest and Intensity X being the strongest. Perceptible to people under favorable circumstances.
What is the strongest intensity scale?
Intensity X (10)
is the highest value on the MMI. Learn more: Earthquake Magnitude, Energy Release, and Shaking Intensity. Modified Mercalli Intensity Scale.
What is the description of a moderately strong intensity?
Moderately strong
Felt generally by people indoors and by some people outdoors
. Hanging objects swing considerably. Motorcars may rock slightly. Liquids in containers are slightly disturbed.
What does the Mercalli intensity Scale depend on?
Intensity depends on
your distance from the epicenter and the geologic area
. The Modified Mercalli scale measures the earthquake’s effect on people, property and ground damage. Roman numerals are used to rate the intensity and damage. An earthquake may have a different intensity rating at different locations.
What are the earthquake intensity scale and their description?
| magnitude level category effects | 4.0–4.9 light felt by all; minor breakage of objects | 5.0–5.9 moderate some damage to weak structures | 6.0–6.9 strong moderate damage in populated areas | 7.0–7.9 major serious damage over large areas; loss of life |
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How do you measure earthquake intensity?
The Richter scale defines the magnitude of an earthquake to be
R=log(IcIn)
where Ic is the intensity of the earthquake and In is the intensity of a standard earthquake.
What is the difference between Richter scale and Mercalli scale?
While the Mercalli scale describes the intensity of an earthquake based on its observed effects, the Richter scale describes the earthquake’s magnitude by measuring the seismic waves that cause the earthquake.
What is the relationship between magnitude and intensity?
Magnitude measures the energy released at the source of the earthquake
. Magnitude is determined from measurements on seismographs. Intensity measures the strength of shaking produced by the earthquake at a certain location. Intensity is determined from effects on people, human structures, and the natural environment.
Is a 4.5 earthquake strong?
Events with
magnitudes greater than 4.5 are strong enough to be recorded by a seismograph anywhere in the world
, so long as its sensors are not located in the earthquake’s shadow. The following describes the typical effects of earthquakes of various magnitudes near the epicenter. … Recorded by seismographs.
What is the largest earthquake ever recorded?
| Mag Alternative Name | 1. 9.5 Valdivia Earthquake | 2. 9.2 1964 Great Alaska Earthquake, Prince William Sound Earthquake, Good Friday Earthquake | 3. 9.1 Sumatra-Andaman Islands Earthquake, 2004 Sumatra Earthquake and Tsunami, Indian Ocean Earthquake | 4. 9.1 Tohoku Earthquake |
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What is the Richter scale range?
Scientific definitions for Richter scale
The scale has no upper limit but usually ranges from
1 to 9
. Because it is logarithmic, an earthquake rated as 5 is ten times as powerful as one rated as 4. An earthquake with a magnitude of 1 is detectable only by seismographs; one with a magnitude of 7 is a major earthquake.
