Yes, and when one is being off due to repairs and/or tunning, other remains on. All the seismographs are always on, and were has to be repaired and/or tunned, there is always a backup one on.
No. Without a 3rd peice of data from another station, there will always be 2 different possible locations of the epicenter. You must have 3 seismographs to collect the data.
Seismographs can detect earthquakes from far beyond 100 miles if sensitive enough. Sometimes many instruments at great distances are used to calculate the severity of the quake.
The three types of the Seismographs are: - magnitude,shaking and focus.
The two types of seismographs are analog seismographs, which use a pen and rotating drum to record seismic activity on paper, and digital seismographs, which use electronic sensors to detect and record seismic waves digitally.
Multiple seismographs
They learn about the one and only God.
Darkrai is the only one who can learn it by level, although Smeargle can use Sketch to learn it as well.
seismogram are the records or paper copies that are produced by seismographs used to calculate the location and magnitude of an earthquack
Scientists learn about the Earth's interior through the use of seismographs. Since seismic waves travel at various speeds when passing through different types of material, scientists will be able to formulate the conditions of the Earth's interior.
seismologists
Pikachu