2. October 09, 2014 Agenda 1.Roll 2.PowerPoint Titled Earthquake Measurement 3.Video “Great Quakes”

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4. Subject Area: Earthquake Measurement EQ: What is the epicenter of an Earthquake? Questions: 1.How are earthquakes detected? 2.How do you locate an earthquake? 3.How is the strength of an earthquake measured?

5. Earthquake Measurement After an earthquake occurs, seismologists try to find out when and where it started. They use earthquake sensing devices to determine where the earthquake started and how strong it was. Chapter 7, Section 2

6. Locating Earthquakes Seismographs are instruments located at or near the surface of the Earth that record seismic waves. When the waves reach the seismograph, the seismograph creates a seismogram. A seismogram is a tracing of earthquake motion created by a seismograph. Partner Share: What is the difference between a seismogram and a seismograph ? The difference between a seismogram and a seismograph is …

7. Locating Earthquakes Seismologists use seismograms to calculate where an earthquake started. They also use the seismogram to find where an earthquake’s epicenter. An epicenter is the point on the Earth’s surface directly above the earthquake’s starting point. Partner Share: What is an epicenter ? An epicenter is …

8. Locating Earthquakes A focus is the point inside the Earth where the earthquake began. Partner Share: What is the focus ? A focus is …

9. Locating Earthquakes After the seismograms are placed on a graph, seismologists can see how far away from each station the earthquake was by reading the distance axis and then find the epicenter.

10. Measuring the Earthquakes Strength Seismograms are not only used to find an earthquakes epicenter it is also used to determine the earthquakes strength. The Richter scale is used for measuring an earthquakes strength. There is a pattern related to the amount of energy released by an earthquake and the magnitude of the earthquake. An earthquake with the magnitude of 6.0 on the Richter scale releases 1000 times as much energy as an earthquake with the magnitude of 4.0. Partner Share: What the Richter scale used for ? The Richter scale is used for …

11. Earthquakes in the USA

12. Earthquakes in the last week

13. Great Quakes Questions for your Science Notebook Great Quakes What did you know? Skip 5 lines What did you learn? Skip 5 lines What do you want to know? Skip 5 lines