Triangulation Method-L2-Q1.pptx

Lesson 2: Triangulation Method Prepared by: Mervin A. Boco Learning Competency no. 1 Describe the distribution of the active volcanoes, earthquake epicenter,  Earthquak e The vibration of the earth due to rapid release of energy.  Seismic Wave This are...

Lesson 2: Triangulation Method Prepared by: Mervin A. Boco Learning Competency no. 1 Describe the distribution of the active volcanoes, earthquake epicenter,  Earthquak e The vibration of the earth due to rapid release of energy.  Seismic Wave This are waves of energy travel through the Earth’s Activity 1. Find the Center Objective: Locate the epicenter of an earthquake using the Materials: 1.Hypothetical records of earthquake waves 2. Philippine map 3. Drawing compass 4. ruler Procedure 1: Procedure 2: Compute the distance of the epicentre from each of the stations using the formula: d= Td x 100 km 8 sec. d- distance Td- time difference * The formula is suited because 8 seconds is the interval between the times of arrival of the P-wave and S-wave at a distance of 100 km. Procedure 3: Choose one of the recording stations and measure the computed distance on the map scale (1 cm: 100 km). Set your compass for the computed distance. Procedure 4: Center your compass on the station you have Procedure 5: Repeat steps 3 and 4 for the rest of the stations. You should get three circles that intersect or nearly intersect at a point. This intersection is the Questions: 1.Where is the epicentre of this hypothetical earthquake? 2.What difficulty will you encounter if you will only have data from two recording stations? 3.What do you think is the importance of determining the epicentre of an earthquake? Table 1 Table 2 1.Where is the epicentre of the hypothetical earthquake? -If the three circles 2. What difficulty will you encounter if you only have data from two recording stations? Assuming that the two circles will intersect, the circles will intersect at two points. Therefore. There will be two locations that could possibly be the epicenter. 3. What do you think is the importance of determining the epicentre of an earthquake? Locating earthquake epicenters will pinpoint which fault lines are active. Usually, the less active fault lines stores great amount of potential energy that could cause major earthquake once released. Therefore, places near fault lines that remain inactive for a long  TRIANGULATION METHOD 1. In order to locate the epicentre of an earthquake, you need to determine the time interval between the arrival of the P and S waves (the S-P interval) on the seismograms  TRIANGULATION METHOD 2. Once you have the epicentral distances, you can draw circles to represent each distance on a map. The radius of each circles corresponds to the epicentral distance for each seismic recording station. Once you have drawn all three circles and located the point where all three circles intersect, you will have successfully located