GEOLOGY

Detailed explanation-1: -In theory, at least three stations are required to determine the epicentre of an earthquake.

Detailed explanation-2: -Introduction: The epicenter is the point on Earth’s surface directly above an earthquake. Seismic stations detect earthquakes by the tracings made on seismographs. Tracings made at three separate seismic stations are needed to locate an earthquake epicenter.

Detailed explanation-3: –You need a minimum of three seismograph stations to locate the epicenter of an earthquake using a travel-time graph.-Determining the location of the epicenter is sometimes referred to as “triangulation."

Detailed explanation-4: -Explainthat at least three stations are necessary to find the epicenter of an earthquake. Also explain that although three stations is the minimum, often seismologists use more than three, and the more they use the more accurate the location of the epicenter becomes.

Detailed explanation-5: -Three seismographs are needed. A circle is drawn from each of the three different seismograph locations, where the radius of each circle is equal to the distance from that station to the epicenter. The spot where those three circles intersect is the epicenter (Figure 13.12).