Magnitude and Intensity

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7 Terms

1

PhiVolcs

Is a national institution that monitors and forecasts volcanic eruptions, earthquakes, and tsunamis.

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2

Magnitude

a measure of the total energy released by an earthquake at its source (focus).

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3

Ritcher Scale

  • Charles F. Richter in 1935

  • Measure earthquake magnitude based on seismic wave amplitude

  • Ranging from less than micro earthquakes to over catastrophicearthquakes)

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4

Seismograph

Is a device that measures and records vibrations in the ground caused by earthquakes.

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5

Intensity

the strength of an earthquake as felt by people and the damage it causes to the environment and structures.

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6

Modified Mercalli Intensity Scale

  • Proposed by
    Giuseppe Mercalli in
    1902

  • Measure the
    intensity of ground
    shaking caused by an
    earthquake

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7

Philippine Earthquake Intensity Scale

Philippine version of the Mercalli scale that has only 10 stages

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