Translations:Dictionary:Blind zone/1/en

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{{#category_index:B|blind zone}}

FIG. H-5. Hidden layers. (a) A layer whose velocity (V3) is lower than that of an overlying layer (velocity inversion) does not produce a head wave. (b) The head wave from a thin layer (V2) without sufficient velocity contrast or too thin may not produce a first arrival and not be observable as a distinct event.