. Early geophysical papers of the Society of Exploration Geophysicists . -3fp*== ^ 0 Fig. 4.—Seismograms illustrating method used to determine emergence angle. Angles given represent tilt of seismograph from vertical position. A, low sensitivity; B, high sensitivity; C, timing line. 816

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Keywords: ., bo, bookcentury1900, booksubjectpetroleum, booksubjectprospecting