2
At least three must do so to locate it unambiguously (two stations can narrow it down to one of two locations, which may be good enough if one of them is on a known fault line and the other is nowhere near one).
how many seismograph stations benifit earthquake victims after the damage occurs
3 stations
magnitude and distance betwean the stations, but not right left deviation, assuming the ground is the same.
Providing you have recordings of the earthquake at three different seismometer stations then the epicentre of an earthquake can be found using a technique known as triangulation. For more information, please see the related question.
At least three must do so to locate it unambiguously (two stations can narrow it down to one of two locations, which may be good enough if one of them is on a known fault line and the other is nowhere near one).
To locate the epicenter of an earthquake, you must have SEISMOGRAMS from at least three seismic stations.
how many seismograph stations benifit earthquake victims after the damage occurs
3 stations
magnitude and distance betwean the stations, but not right left deviation, assuming the ground is the same.
Three seismographs stations are needed to pinpoint the location of the epicentre of an earthquake.
determining the distance from the earthquake by three recording stations.
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
failure
The minimum number of seismic stations needed to determine the location of an earthquake's epicenter is THREE.
Providing you have recordings of the earthquake at three different seismometer stations then the epicentre of an earthquake can be found using a technique known as triangulation. For more information, please see the related question.
you need to have 3 seismic stations to triangulate the location of the earthquake and remember a earthquake can be from the inside of the earth but not necessarily at the epicenter because no epicenter is a straight line down.