E-3 Southwestern Pennsylvania to Baltimore Canyon Trough

Glover, Lynn; Klitgord, Kim D.; Sheridan, Robert E.; Costain, John K.; Çoruh, Cahit; Holbrook, W. S.; Poag, C. Wylie; Farrar, Sophie; Evans, Nicholas H.; Mixon, Robert B.; Hutchinson, Deborah R.; Gates, Alexander E.; Pavlides, Louis; Musser, D. L.; Drake, Avery Ala; Benson, R.N.; Froelich, A.J.; Wehr, F. L.; Dawson, J. W.; Schneider, Chris; Bartholomew, Mervin J.; Gibson, Richard G.; Simmons, Noel G; Spears, David B.; Speed, R. C.

doi:10.1130/dnag-cot-e-3

Cited by 3 publications

(1 citation statement)

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“…ratios are not unusual (Kassab & Weller, 2015;Zaitsev et al, 2017). Combined with the surface lithology (King& Beikman 1974;Glover & Klitgord 1995) in the ACP and the studies on low sedimentary Vp/Vs. ratios (Gregory, 1976;Christensen, 1996;Salem, 2000;Brocher, 2005;Mavko et al, 2009;Kassab & Weller, 2015), we inferred that the low Vp/Vs.…”

Section: Comparisons With the Existing Resultsmentioning

confidence: 83%

Characterizing the shallow structure with the multimodal dispersion curves and the body wave refraction traveltimes from deep seismic sounding data

Guo

Li²,

Zhao³

et al. 2023

Front. Earth Sci.

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Deep seismic sounding (DSS) profiles are one of the most powerful tools for detecting crustal structures, and they have been deployed worldwide. Generally, the analysis of DSS data mainly focuses on body waves, while the surface waves are considered noise. We suggest that the surface waves in DSS data can be used to constrain subsurface structures. In this study, we use a DSS profile in the Piedmont and Atlantic Coastal Plain as an example to present the usage of the DSS surface wave. Multimodal dispersion curves were extracted from the DSS data with the Frequency-Bessel transform method, and were used in Monte Carlo joint inversions with body wave refraction traveltimes to constrain the shallow structures. Through the inversion, a horizontal stratum on the surface was identified in the Piedmont, and a two-layer sedimentary structure was identified in the Atlantic Coastal Plain. Comparisons with existing studies verified the accuracy of the shallow structures obtained in this study, demonstrating that the shallow velocity structure could be well constrained with the additional constraints provided by the multimodal dispersion curves. Thus, we believe that further research on the surface waves recorded in DSS surveys is warranted.

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Section: Comparisons With the Existing Resultsmentioning

confidence: 83%

Characterizing the shallow structure with the multimodal dispersion curves and the body wave refraction traveltimes from deep seismic sounding data

Guo

Li²,

Zhao³

et al. 2023

Front. Earth Sci.

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show abstract

Multimodal dispersion curves extracted from deep seismic sounding profile to characterize the sedimentary structure

Guo¹,

Li²,

Zhao³

et al. 2021

Preprint

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

Guo

Zhao

Wang

et al. 2019

Earth Planets Space

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The eastern North American rifted margin is a passive tectonic margin that has experienced Paleozoic ocean closure and Mesozoic continent rifting. To understand evolution of this continental margin, we modeled the two-dimensional P-wave and S-wave seismic velocity structure of the crust with a seismic wide-angle reflection/refraction profile located in North Carolina and Virginia. There is a seismic low-velocity zone (LVZ) at 10-12 km depth beneath the western segment of the profile. We infer the LVZ to be the base of a Paleozoic metasedimentary succession beneath the eastern Piedmont and westernmost coastal plain. The P-wave velocity and Poisson's ratio suggest a felsic composition for the upper and middle crust beneath the seismic profile, and an intermediate composition for the lower crust. Overall, the measured crustal velocities and the lateral homogeneity of the crust, especially the middle and lower crust, indicate that Laurentian middle and lower crust extends beneath the entire coastal plain. The lack of a basal crustal layer with a high seismic velocity indicates that no magmatic intrusions have underplated the eastern Piedmont and coastal plain. The comparison with South China Sea, which is a wide rift, and Kenya Rift, which is a narrow rift, indicates that eastern North American margin has the character of a narrow rift. We infer that narrow rifts and wide rifts may have similar crustal compositions, but show strong differences in crustal thickness and the distribution of basal crustal mafic intrusion. These differences may be related to differences in extensional rate during rifting. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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E-3 Southwestern Pennsylvania to Baltimore Canyon Trough

Cited by 3 publications

References 0 publications

Characterizing the shallow structure with the multimodal dispersion curves and the body wave refraction traveltimes from deep seismic sounding data

Characterizing the shallow structure with the multimodal dispersion curves and the body wave refraction traveltimes from deep seismic sounding data

Multimodal dispersion curves extracted from deep seismic sounding profile to characterize the sedimentary structure

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

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