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**Earthquake Measurement**

Chapter 8 Section 2

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Locating Earthquakes Seismograph- an instrument that records vibrations in the ground and strength of an earthquake Seismogram- a tracing of earthquake motion that is created by a seismograph

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**Determining Time and Location of Earthquake**

Start time is determined by noting the difference in arrival times of P waves and S waves. Seismograms is used to find the epicenter Epicenter- the point on the Earth’s surface directly above the earthquake’s starting point- focus Focus- the point along a fault at which the first motion of an earthquake occurs

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**S-P Time Method Used to find the epicenter Compare the results of**

different seismograms of the same earthquake and find the common point

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**Measuring Earthquake Strength**

Earthquake ground motion Magnitude increases by 1 unit, measured ground motion becomes 10 times larger Example: 0.5 on the Richter Scale produces 10x the ground motion as a 0.4. A 0.6 produces a 100x (10 x 10)the ground motion as a 0.4. Measuring Earthquake Strength

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**Measuring Earthquake Intensity**

The degree in which it is felt by people and the damage it causes Modified Mercalli Intensity Scale to measure Ranked with Roman numerals I being the lowest ( not felt by most people) and XII being the highest (indicates total damage of an area)

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