A.1
B.2
C.3
D.4
Chosen Answer:
The answer is C. You need at least 3 station to triangulate the position. Having just one station gives you only distance information. This outlines a circle with radius being that distance. With two stations (at different locations), you can have two circles each with their own radis equal to the distance from the epicentre to individual stations. However, there are two intersecting points. Finally having three stations (at different locations), three circles would have only one intersecting point – the epicentre.
by: Oscar
on: 7th January 13