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1. Compute the distance of the epicenter from cach of the stations using this formula: d - time differencex 100 km 8 seconds where: d - distance (km) td - time difference in the arrival time of P-wave and S-wave (seconds) This 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.

1. Compute the distance of the epicenter from cach of the stations using this formula: d - time differencex 100 km 8 seconds where: d - distance (km) td - time difference in the arrival time of P-wave and S-wave (seconds) This 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.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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Learning Task 1: Study the activity. Follow the procedure before answering the questions. Find the Epicenter (Adapted and modified from the Learner's Material) Materials: Hypothetical records of earthquake waves Philippine map Drawing compass and ruler Marking pens (3 different colors) Procedure: Study the data showing the difference in the arrival time of P-wave and S-wave on three seismic recording stations. Time difference in the arrival time of P- wave and S-wave Distance of epicen- tre from the station Recording station (km) Occidental Mindoro 40 Samar 32 Zambonga del Norte 36 1. Compute the distance of the epicenter from each of the stations using this formula: d i • time difference x 100 km 8 seconds where: d - distance (km) td - time difference in the arrival time of P-wave and S-wave (seconds) This 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. 2. Choose one of the recording stations and measure the computed dis- tance on the scale (the scale of the map is 1 cm: 100 km). Set your compass for that computed distance. Center your compass on the sta- tion you have chosen. Draw a circle. 3. 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
Transcribed Image Text:Learning Task 1: Study the activity. Follow the procedure before answering the questions. Find the Epicenter (Adapted and modified from the Learner's Material) Materials: Hypothetical records of earthquake waves Philippine map Drawing compass and ruler Marking pens (3 different colors) Procedure: Study the data showing the difference in the arrival time of P-wave and S-wave on three seismic recording stations. Time difference in the arrival time of P- wave and S-wave Distance of epicen- tre from the station Recording station (km) Occidental Mindoro 40 Samar 32 Zambonga del Norte 36 1. Compute the distance of the epicenter from each of the stations using this formula: d i • time difference x 100 km 8 seconds where: d - distance (km) td - time difference in the arrival time of P-wave and S-wave (seconds) This 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. 2. Choose one of the recording stations and measure the computed dis- tance on the scale (the scale of the map is 1 cm: 100 km). Set your compass for that computed distance. Center your compass on the sta- tion you have chosen. Draw a circle. 3. 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
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