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Earthquake Measurement

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Presentation on theme: "Earthquake Measurement"— Presentation transcript:

1 Earthquake Measurement
Chapter 8 Section 2

2 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

3 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

4 S-P Time Method Used to find the epicenter Compare the results of
different seismograms of the same earthquake and find the common point

5 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

6 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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