Tracing young faults in the Atlantic Coastal Plain sediments: Use of composite refraction-reflection stack sections

Conference · Tue Mar 01 04:00:00 EST 1994 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:6786001

Stephenson, D E ^[1]; Coruh, C; Costain, J K; Domoracki, W J ^[2]

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1. Westinghouse Savannah River Co., Aiken, SC (United States)
2. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)

Study of the basement faults that penetrate upward into the Atlantic Coastal Plain sediments might constrain the timing of deformation in the form of folding and faulting. Composite refraction-reflection stack sections are produced by reprocessing available seismic data to investigate basement faults that penetrate upward into Atlantic coastal Plain sediments near Aiken, South Carolina. The purpose of the refraction stack was to recover events as shallow as possible while reprocessing of the reflected arrivals was designed to image reflections from depths as deep as the Moho. Seismic data processing for refracted head wave arrivals produced refraction stack sections that constrain the upward penetration depth of the faults image and interpreted in crystalline basement and Triassic sediments. The faulting, in general, is not limited to the Triassic Dunbarton basin, which is interpreted to be bounded by reverse (at the NW) faults. Other faults are also imaged in the sediments and extend upward. Displacement imaged along faults decreases rapidly upward from the basement. The composite refraction-reflection stack sections exhibit that the depth of upward penetration of the faults varies: most of them are associated with deformation at times as small as 50 ms two-way time (about 25 m), while two faults (the Atta and Steel Creek) penetrate to depths that include a shallow refracted horizon. Imbricated upper crustal structures, the buried Triassic Dunbarton basin, and reverse and normal faults suggest that the subsurface is overprinted by compression followed by extension and later by compression.

• OSTI ID: 6786001
• Report Number(s): CONF-9404221--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 26:4
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
DATA ANALYSIS
DEVELOPED COUNTRIES
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
NORTH AMERICA
SEISMIC SURVEYS
SOUTH CAROLINA
SURVEYS
US EAST COAST
USA