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1. • • 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.
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     8.9: Magnitude vs. Intensity - Geosciences LibreTexts

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   What is the magnitude of an earthquake?

   • Magnitude is the size of the earthquake. An earthquake has a single magnitude. The shaking that it causes has many values that vary from place to place based on distance, type of surface material, and other factors. See the Intensity section below for more details on shaking intensity measurements. Types of Magnitudes

   Earthquake Magnitude, Energy Release, and Shaking Intensity

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   How are earthquake magnitudes determined?

   • Earthquake magnitudes are determined by measuring the amplitudes of seismic waves. The amplitude is the height of the wave relative to the baseline (Figure 9.13). Wave amplitude depends on the amount of energy carried by the wave. The amplitudes of seismic waves reflect the amount of energy released by earthquakes.

   9.2 Measuring Earthquakes – Principles of Earth Science

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   How big a quake is considered a major earthquake?

   • Quakes that range from 6.1 to 6.9 magnitude can cause "a lot of damage in very populated areas," while a 7.0 to 7.9 magnitude earthquake is considered a major earthquake causing serious damage. Next is an 8.0 or greater magnitude, which is considered a massive quake that can "totally destroy communities" near its epicenter.

   How are earthquakes measured? Get the details on magnitude scales …

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   Why do earthquakes have a moment magnitude scale?

   • Moment magnitude can capture the difference between short earthquakes and longer ones resulting from larger ruptures, even of both types of earthquakes generate the same amplitude of waves. The moment magnitude scale is also better for earthquakes that are far from the seismic station.

   9.2 Measuring Earthquakes – Principles of Earth Science

   openoregon.pressbooks.pub/earthscience/chapter/9-2-measuring-earthquakes/

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3. www.usgs.gov › programs › earthquake-hazardsEarthquake Magnitude, Energy Release, and Shaking Intensity

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   An earthquake has a single magnitude. The shaking that it causes has many values that vary from place to place based on distance, type of surface material, and other factors. See the Intensity section below for more details on shaking intensity measurements. Types of Magnitudes.

4. www.cbsnews.com › news › how-are-earthquakesHow are earthquakes measured? Get the details on magnitude ...

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   Apr 5, 2024 · The quake had a magnitude of 4.8, according to the U.S. Geological Survey, and it was followed by several aftershocks, including one with a magnitude of 4.0. No major damage was reported as of...

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5. geo.libretexts.org › Bookshelves › Geology8.9: Magnitude vs. Intensity - Geosciences LibreTexts

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   Magnitude and Intensity measure different characteristics of earthquakes. 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.

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7. www.usgs.gov › index › faqsHow are earthquakes recorded? How are earthquakes measured ...

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   FAQ. What is the difference between earthquake magnitude and earthquake intensity? What is the Modified Mercalli Intensity Scale? Magnitude scales, like the moment magnitude, measure the size of the earthquake at its source. An earthquake has one magnitude. The magnitude does not depend on where the measurement is made.

8. openoregon.pressbooks.pub › earthscience › chapter9.2 Measuring Earthquakes – Principles of Earth Science

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   Earthquake magnitudes are determined by measuring the amplitudes of seismic waves. The amplitude is the height of the wave relative to the baseline (Figure 9.13). Wave amplitude depends on the amount of energy carried by the wave.

9. k12.libretexts.org › Bookshelves › Science_and6.18: Earthquake Magnitude Scales - K12 LibreTexts

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   Jan 11, 2021 · The moment magnitude scale is the favored method of measuring earthquake magnitudes. It measures the total energy released by an earthquake. Moment magnitude is calculated by two things. One is the length of the fault break. The other is the distance the ground moves along the fault.