triangulation method 12345678901234.pptx

triangulation method

1. METHOD Triangulation EARTHQUAKE'S EPICENTER

2. Describe and relate the distribution of active volcanoes, earthquake epicenters, and major mountain belts to Plate Tectonic Theory (S10ES – Ia-j-36.1) MOST ESSENTIAL LEARNING COMPETENCY:

3. Compare & contrast: Epicenter - focus

4. Compare & contrast: seismogram - seismograph

5. HOW DO THE SEISMOLOGIST LOCATE THE EPICENTER OF THE EARTHQUAKE?

6. TRIANGULATION METHOD A method that involves taking seismographic measurements from at least three separate seismic stations. Seismologists measure the distance and the time it takes seismic waves to reach the recording stations, and triangulate the measurements to calculate the location of the epicenter.

7. HOW TO LOCATE? -Determine the time interval between the arrival of the P & S waves on the seismograms from at least three different stations. -Measure the interval to the closest second & then use a graph to convert the S-P interval to the epicentral distances. -Once you have the epicentral distances, you can draw circles to represent each distance on a map. -When you have drawn all three circles & located the point where all 3 intersects you have successfully located the epicenter of the earthquake.

8. TRY THIS! What point on the surface of the earth that lies directly above the origin of the earthquake?

9. TRY THIS! What point on the surface of the earth that lies directly above the origin of the earthquake? EPICENTER

10. What is needed to determine the distance of the epicenter from a seismic station? TRY THIS!

11. What is needed to determine the distance of the epicenter from a seismic station? TRY THIS! THE DIFFERENCE IN THE ARRIVAL TIME OF P-WAVE AND S-WAVE

12. TRY THIS! What is needed to determine the exact location of epicenter of an earthquake?

13. TRY THIS! What is needed to determine the exact location of epicenter of an earthquake? THE DISTANCE OF THE EPICENTER FROM THREE DIFFERENT SEISMIC STATIONS

14. do this activity: find the center