L18_SeismicRefractionI-page7

L18_SeismicRefractionI-page7 - direct and head wave Head...

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7 Applied Geophysics – Refraction I Mapping vertical contacts Infinite/large offsets For infinite/large vertical offsets there is no secondary head wave Three segments Direct wave Head wave Diffracted wave Will have the velocity close to the direct wave Reverse the line • Shooting to the same string of geophones from the other end • Two traveltime segments:
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Unformatted text preview: direct and head wave Head wave generated from energy entering the high velocity layer at the vertical interface Applied Geophysics Refraction I Dipping layers Dipping layers still produce head waves but the traveltimes are affected by the dip Shooting up-dip: the velocity appears greater Shooting down-dip: the velocity is reduced...
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