how many seismograph stations benifit earthquake victims after the damage occurs
There are 14838 seismograph stations of which 11559 are open and 3279 are closed, as of 11th March at 2030 UTC/GMT. Source: United States Geographical Survey.
It takes 3 stations.
yes
TWO
three
Three stations would best pinpoint the epicentre by triangulation.
At least 3 stations are required to find the epicenter
yes because the waves sometimes travel very fast
P-waves are the first seismic waves to arrive at a seismograph station.
yes it can
Three seismograph stations are needed to determine the location of an epicenter because each seismograph can determine distance to the epicenter but not direction. The point where the three circles intersect is the epicenter of the earthquake. +++ Focus - not epicentre, which is the point of maximum movement on the surface above the slip itself.