Yes they do. they do this because if the waves come from the earthquake, which they do. they can just trace the waves back to the earthquake and find the epicenter
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By measuring the time difference between the arrival of P-waves and S-waves at a seismic station, seismologists can calculate the distance from the station to the earthquake's epicenter. P-waves travel faster than S-waves, so the greater the time lag between their arrivals, the farther the station is from the epicenter. By using data from multiple stations, seismologists can triangulate the location of the epicenter.
To find the epicenter of an earthquake using triangulation, seismologists analyze the arrival times of seismic waves at three or more seismic stations. By comparing the differences in arrival times, they can determine the distances from each station to the epicenter. By drawing circles with the stations as the center and their respective distances as the radius, the intersection of these circles represents the estimated epicenter of the earthquake.
Scientists use seismic waves to find an earthquake epicenter. By analyzing the arrival times of primary (P) and secondary (S) seismic waves at different seismic stations, scientists can triangulate the epicenter of the earthquake.
This job would normally be undertaken by a type of geophysicist known as a seismologist rather than a geologist. For information on how seismologists locate seismic waves, see the related question.
3. With 2 you can get possible locations (where the 2 circles intersect). With the 3rd reading, that circle will intersect the other two circles at one of those 2 candidate locations. See the link for a description.http://www.geo.mtu.edu/UPSeis/locating.html
By measuring the time difference between the arrival of P-waves and S-waves at a seismic station, seismologists can calculate the distance from the station to the earthquake's epicenter. P-waves travel faster than S-waves, so the greater the time lag between their arrivals, the farther the station is from the epicenter. By using data from multiple stations, seismologists can triangulate the location of the epicenter.
To find the epicenter of an earthquake using triangulation, seismologists analyze the arrival times of seismic waves at three or more seismic stations. By comparing the differences in arrival times, they can determine the distances from each station to the epicenter. By drawing circles with the stations as the center and their respective distances as the radius, the intersection of these circles represents the estimated epicenter of the earthquake.
Scientists use seismic waves to find an earthquake epicenter. By analyzing the arrival times of primary (P) and secondary (S) seismic waves at different seismic stations, scientists can triangulate the epicenter of the earthquake.
seismic waves
By finding the arrival time of the P waves and S waves :)
P waves travel faster than S waves and arrive at seismograph stations first. By measuring the time difference between the arrival of P and S waves at multiple stations, seismologists can determine the distance to the epicenter of an earthquake. Trilateration is then used to pinpoint the exact location where the seismic waves originated.
This job would normally be undertaken by a type of geophysicist known as a seismologist rather than a geologist. For information on how seismologists locate seismic waves, see the related question.
3. With 2 you can get possible locations (where the 2 circles intersect). With the 3rd reading, that circle will intersect the other two circles at one of those 2 candidate locations. See the link for a description.http://www.geo.mtu.edu/UPSeis/locating.html
To locate the epicenter you use the speed of waves that travel from the epicenter to the seismic sensor locations. With two sensors you are able to narrow the location to two places (when on a surface using intersecting hyperbolas). With a third sensor you have the location on a surface and below ground. This third sensor is why they call it tri - angulation but the angles are hard to find without HS trigonometry and other mathematics.
Triangulation. First, they calculate the time between the first and second - primary and secondary - seismic waves created in an earthquake and use this information to determine how far the seismometer is from the epicenter of the earthquake. A circle is drawn around the seismometer so that it is in the center and the radius is equal to the calculated distance. Using this information from three different seismometers, two more circles are drawn and the intersecting point of the three circles is where the epicenter of the earthquake is located.
The difference in arrival times of P-waves and S-waves can be used to find an earthquake's epicenter. P-waves travel faster than S-waves, so by measuring the time lag between the arrival of the two wave types at different seismic stations, scientists can triangulate the epicenter of the earthquake.
The S-P time method is perhaps the simplest method seismologists use to find an earthquake's epicenter. +++ No it's not. That finds its Focus. The Epicentre is the point of maximum movement on the land surface above the slip itself.