Study the data showing the difference in the arrival time of P-wave and S-wave on three seismic recording stations. Time difference in Distance of epicen- the arrival time of P- tre from the station Recording station wave and S-wave (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:

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2e descr
ons. Th
Learning Taak 1: Study the activity. Follow the procedure before answering the
questions.
n the
Find the Epicenter
(Adapted and modified from the Learner's Materlal)
zon
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.
Distance of epicen-
Time difference in
tre from the station
the arrival time of P-
Recording station
(km)
wave and S-wave
40
Occidental Mindoro
32
Samar
36
Zambonga del Norte
1. Compute the distance of the epicenter from each of the stations using
this formula:
d = 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
PIVOT 4A CALABARZON
8.
Transcribed Image Text:2e descr ons. Th Learning Taak 1: Study the activity. Follow the procedure before answering the questions. n the Find the Epicenter (Adapted and modified from the Learner's Materlal) zon 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. Distance of epicen- Time difference in tre from the station the arrival time of P- Recording station (km) wave and S-wave 40 Occidental Mindoro 32 Samar 36 Zambonga del Norte 1. Compute the distance of the epicenter from each of the stations using this formula: d = 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 PIVOT 4A CALABARZON 8.
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