Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 156 MAURICE EWING AND A. P. CRARY EMERGENCE ANGLE A new method was used to measure the emergence angle 0o of the waves. The seismograph was of the type technically known as a 60 40 / f 9 • 2000 4000 Velocity (ft/3ea> Fig. 3.—Velocity-depth relation (Green Pond). geophone. It was originally designed to measure only vertical motions but after an alteration of the spring suspension was made it would c -3fp*== ^ 0 Fig. 4.—Seismograms illustrating method
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 156 MAURICE EWING AND A. P. CRARY EMERGENCE ANGLE A new method was used to measure the emergence angle 0o of the waves. The seismograph was of the type technically known as a 60 40 / f 9 • 2000 4000 Velocity (ft/3ea> Fig. 3.—Velocity-depth relation (Green Pond). geophone. It was originally designed to measure only vertical motions but after an alteration of the spring suspension was made it would c -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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