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Earth, Planets and Space
Fig. 6 | Earth, Planets and Space

Fig. 6

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

Fig. 6

a The record section of SP1. Region A′ is the expansion of region A, showing that there is a strong reflection after the Pg phase. b The record section of SP3. Region B′ is the expansion of region B, indicating there is a reflection after Pg. It is close to Pg, so it is possibly generated by the very shallow structure. Region C shows a step of Pg, and region D shows that there is a shadow zone between 60 and 80 km, indicating a low-velocity zone (LVZ) in upper crust (Park et al. 2010). Note that this LVZ is not the LVZ above (Figs. 3a, 5); rather this LVZ is much shallower and smaller

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