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Earthquake - Magnitude, Intensity, Effects: The violence of seismic shaking varies considerably over a single affected area. Because the entire range of observed effects is not capable of simple quantitative definition, the strength of the shaking is commonly estimated by reference to intensity scales that describe the effects in qualitative terms.
Two different viewpoints underpin the most important measurements related to earthquakes: magnitude and intensity. To scientists, an earthquake is an event inside the earth. To the rest of us, it is an extraordinary movement of the ground. Magnitude measures the former, while intensity measures the latter.
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- Magnitude
- Energy Release
- Intensity
- Examples
- What Would It Take to Make A Magnitude N Earthquake?
The time, location, and magnitude of an earthquake can be determined from the data recorded by seismometer. Seismometers record the vibrations from earthquakes that travel through the Earth. Each seismometer records the shaking of the ground directly beneath it. Sensitive instruments, which greatly magnify these ground motions, can detect strong ea...
Another way to measure the size of an earthquake is to compute how much energy it released. The amount of energy radiated by an earthquake is a measure of the potential for damage to man-made structures. An earthquake releases energy at many frequencies, and in order to compute an accurate value, you have to include all frequencies of shaking for t...
Whereas the magnitude of an earthquake is one value that describes the size, there are many intensity values for each earthquake that are distributed across the geographic area around the earthquake epicenter. The intensity is the measure of shaking at each location, and this varies from place to place, depending mostly on the distance from the fau...
These examples illustrate how locations (and depth), magnitudes, intensity, and faults (and rupture) characteristics are dependent and related. Intensity of Shaking Depends on the Local Geology Intensity of Shaking Depends on Depth of the Earthquake The shaking from the M6.7 Northridge, CA earthquake was more intense and covered a wider area than t...
If we sum all of the energy release from all of the earthquakes over the past ~110 years, the equivalent magnitude ~ Mw9.95. If the San Andreas Fault were to rupture end-to-end (~1400km), with ~10m of average slip, it would produce an earthquake of Mw 8.47. If the South American subductionzone were to rupture end-to-end (~6400km), with ~40m of aver...
Scientists describe the intensity of an earthquake using the Richter Scale. It measures earthquakes on a scale of 1 to 10. People barely feel a magnitude 3 earthquake, and windows might rattle at magnitude 4. A magnitude 6 earthquake is considered major, causing houses to move and chimneys to fall.
- what if earthquakes never had a role in natural phenomenons?Earthquakes don't happen by themselves. They appear after rocks and tectonic plates meet. That happens because of the movement of mantle under crus...
- so im guessing by the way earthquakes are rated 1 through 10 which one will cause the most damage th...While the 1 to 10 part is true, it's not quite so simple as a 4 being a little bit stronger than a 3. The scale is exponential. That means, the dif...
- What causes the ground to push together?Tectonic plates are large slabs of rock that lie underneath us, named after the geographical location in which they are found. They make up what is...
- If earthquakes have to do with tectonic plate movement, can they be used to detect volcanoesYes, so the informaton of earthquake is used to predict volcanic activities.
Earthquake Intensity Database. 1638 - 1985. Download Database (MS Excel format; 15MB) Earthquake intensities are numerical values assigned to the effects of earthquakes on people and their works, and on the natural environment. Intensities are evaluated using the Modified Mercalli Intensity Scale of 1931, which contains levels of effects ...
Open Educational Resources. The outcome for this section will be covered by several Open Educational Resources. Review and reflect on each one as you prepare to complete the assessment for this module. Reading: Earthquake Intensity. Reading: Magnitude vs. Intensity.
