Question

Why is the minimum three seismic stations needed to fid the epicenter of earthquake?

Answer 1

 Locating the epicenter. At least three seismic stations are needed to find the earthquake epicenter.

If there is information from only one station, the epicenter of the earthquake could at any point on that circle. If there is information from two stations, the circles intersect at two points, so there are two possible epicenters. With three stations, the circles intercept at only one point, which must be the epicenter

Answer 2

Earthquakes often takes place in the earth. It is very essential to use at least three separated angles and strengths/times because;

• Three stations are required for the "triangulate" process so as to know the location.

• It helps to rightly determine the position of any of the source.
• it can be used to know the epicenter by it showing where it intersects.
• It helps us to be able to calculate the distance from the epicenter to each seismograph.

The exact location of the earthquake's epicenter is known to be in the perimeter of a circle drawn around the recording station.

The radius of the said circle is referred to as the epicentral distance. One S - P measurement will give us an epicentral distance.

Triangulation is therefore needed so that an individual can know the exact arrival time of the P and S waves produced by an earthquake for the three different seismograph stations.

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