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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: Crustal structure of the eastern Piedmont and Atlantic coastal plain in North Carolina and Virginia, eastern North American margin

Fig. 3

Record section generated by the westernmost shot SP1 and easternmost shot SP2 are plotted at a reduction velocity 6 km/s, and the amplitudes are normalized for each trace. The white dashed lines indicate the picked travel times. These is no filter for the P-wave record section, while an Ormsby band-pass filter of 2–12 Hz is used for the S-wave record section to enhance the signal-to-noise ratio. a The P-wave record section of SP1. Six principal seismic phases (Pg, P1P, P2P, P3P, P4P, and PmP) have been identified based on the reciprocal traveltimes. b The S-wave record section of SP1. Six principal seismic phases (Sg, S1S, S2S, S3S, S4S, and SmS) have been identified. c The P-wave record section of SP2. Six principal seismic phases (Pg, P1P, P3P, P4P, PmP, and Pn) have been identified. The uppermost mantle refraction Pn is only visible in the record section of SP2. d The S-wave record section of SP2. After a filter, only four principal seismic phases (Sg, S2S, SmS, and Sn) have been identified

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