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When all body waves are excited at the same time the s-wave arrives after the p-wave to the sensors sensor, hence the name "secondary".
See also
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Physics / Mechanics / Continuum mechanics / Mechanical waves / Body wave
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When all body waves are excited at the same time the s-wave arrives after the p-wave to the sensors sensor, hence the name "secondary".
...
Physics / Mechanics / Continuum mechanics / Mechanical waves / Body wave
...