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How Earthquakes are Located and Measured

How Earthquakes are Located and Measured. By Jacob and Christian. How Seismologists Measure Earthquakes. Triangulation is the process they use to find the epicenter, or the middle of an earthquake Triangulation requires the seismogram

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How Earthquakes are Located and Measured

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  1. How Earthquakes are Located and Measured By Jacob and Christian

  2. How Seismologists Measure Earthquakes • Triangulation is the process they use to find the epicenter, or the middle of an earthquake • Triangulation requires the seismogram • To pin the exact location, seismologists use three seismograms that are in three different locations • According to Ask.com

  3. How Earthquake Damage is Measured • Mercalli Scale • Measures damage, not magnitude • Earthquakes can be measured from I to XII • Not very accurate • According to our science book

  4. How Earthquake Magnitudes are Measured • To measure magnitude, scientists can use the Richter Scale; a scale that has a base ten system • Magnitude 1=6 ounces of TNT blown up • Magnitude 8=6 million tons of TNT blown up • The Richter Scale measures energy, not damage • According to UPSeis

  5. Formulas for Measuring Earthquakes • Mb=log10 (A/T) + Q (D,h) • Mb is body wave magnitude • A is the amplitude of ground motion in microns • T is the corresponding period in seconds • Q (D, h) is the correction factor in a function of distance: D is degrees, h (in kilometers) of the earthquake • According to USGS

  6. Formulas (continued) • MS = log10 (A/T) + 1.66 log10 (D) + 3.30 • Standard surface wave formula • A, T, and D are the same exact variables as the Mb formula • According to USGS

  7. The End Thank you for watching the power point. Now it is time to go to the jeopardy (one pointer: the bottom four questions are bonuses and information may not be in the power point).

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