In which seismogram is the time probe placed at the beginning of the p waves?

seismogram a
seismogram b
seismogram c
seismogram d

Answer;

Seismogram C

Explanation;

In Seismogram C the time probe is placed at the beginning of the P waves because the C line doesn't  start till u see the signal wave.

A seismogram is a graph output or a record written by a seismograph in response to ground motions produced by an earthquake, explosion, or other ground-motion sources.. It is a record of the ground motion at a measuring station as a function of time.

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