I ran a 60 m seismic line. Energization with hammer. 12 (10 hz vertical 5 m spaced) geophones and 5 shots (15 m spaced). Record length 0.5 s. Thanks to a borehole near a estrata of gravelly silt man-made (0.40 m) and very soft silty clay (to 5 m) and then clay improves its consistency deeper. My seismic traces seemed to be ok, but at office the principal wave train gives 200 m/s and first arrivals refractions are that weak that can not be easily identified. I think the principal train wave shadows them.

My question: ¿What is the meaning of a 200 m/s train wave in geophysics?

  • $\begingroup$ This question might be better suited to SE Earth Science. $\endgroup$
    – Fred
    Jul 19 '19 at 19:13
  • $\begingroup$ I understand. Thank you @Fred. link $\endgroup$ Jul 23 '19 at 18:21
  • $\begingroup$ It is a wave of sound that travels at 200m/s but due to being slower than the train causes an "echo" dispersing the detail of refractive return. $\endgroup$
    – Rhodie
    Jul 29 '19 at 0:01

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