Question

Where are the three seismographs used to find the epicenter of this earthquake located?

Answer 1

The given question is incomplete. It is missing an attachment which is added below. According to the attachment provided, the solution is as follows-

The seismologists commonly used the triangulation method from the data that is acquired by the seismograph. This method is used by the help of three seismographs that are placed at three different locations. During the time of the earthquake, these seismographs record the data and forms three distinct circles. These three circles obtained from the three seismographs intersect at a common point, and this point is the epicenter of the earthquake.

Thus, from the image, looking at the three circles and the intersecting point the epicenter can be determined.

Therefore, the three seismographs are used at Minneapolis, Detroit, and Charleston in order to find the earthquake epicenter.

Answer 2

Scientists use triangulation to find the epicenter of an earthquake. When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects. Every earthquake is recorded on numerous seismographs located in different directions. Each seismograph records the times when the first (P waves) and second (S waves) seismic waves arrive. From that information, scientists can determine how fast the waves are traveling. Knowing this helps them calculate the distance from the epicenter to each seismograph.

To determine the direction each wave traveled, scientists draw circles around the seismograph locations. The radius of each circle equals the known distance to the epicenter. Where these three circles intersect is the epicenter.