3. Choose one of the recording stations and measure the computed distance on the map scale (the scale of the map in Figure 3 is 1.5 cm: 200 km). Set your compass for that computed distance. 4. Center your compass on the station you have chosen. Draw a circle. 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 epicenter. Talwan CHINA 100 200 km 100 200 mi China Palawan BABUYAN LANDS Aparri San Fernando, Baguio Luzon Angeles Quezon City MANILA Batangas Mindoro Panay Legaspi Samar floilo Bacolod Guimaras Island Puerto Princesa Negros Leyte Cebu City Butuan fligan Cagayan de Oro Mindanao Davao, Mount Apo Zamboanga Basilan Jolo MALAYSIA INDONESIA http://earthquake.usgs.gov Figure 3. Map of the Philippines HOR
Answer (1)
Choose one recording station and measure the computed distance using the map scale (1.5 cm = 200 km).Set your compass to that distance.Center the compass on the recording station and draw a circle.Repeat for the other stations.The point where the three circles intersect is the earthquake epicenter.
