Question

2 multiple-choice 1 point
how many seismographs are needed to triangulate the origin of an earthquake?
2
1
3
4

Explanation:

To triangulate an earthquake's origin (epicenter), each seismograph provides a distance from the station to the epicenter, forming a circle. Two circles intersect at two points, leaving ambiguity. Three circles intersect at a single unique point, which is the precise epicenter.

Answer:

3