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Northeast-oriented transpression structure in the northern New Madrid seismic zone; extension of a shear zone across the Reelfoot Fault stepover arm

Edward W. Woolery and Ali Almayahi
Northeast-oriented transpression structure in the northern New Madrid seismic zone; extension of a shear zone across the Reelfoot Fault stepover arm
Bulletin of the Seismological Society of America (October 2014) 104 (5): 2587-2596

Abstract

High-resolution seismic-reflection profiles recently acquired 12 km northeast of the New Madrid seismic zone"s Reelfoot thrust and along the central axis of the Reelfoot rift, imaged steeply dipping N30 degrees E striking faults that have uplifted and arched post-Paleozoic sediments in a manner consistent with a dextral strike-slip component of displacement. The subparallel fault strands have been traced 1.4 km between reflection profiles. In order to evaluate the structure's potential regional scale, the strike was projected northeast 22 km to its intersection with a nearby industry profile. At the intersection, this lower-resolution profile exhibits a discrete 0.75 km wide structure with style and offset similar to the high-resolution lines. The high-resolution images indicate the deformation extends above Paleozoic bedrock, affecting the Late Cretaceous and Eocene Mississippi embayment sediments, as well as the base of the Quaternary. The Paleozoic and Cretaceous horizons show as much as 75 and 50 m of relief, respectively, with the middle Eocene and basal Quaternary disrupted 25 and 15 m, respectively. Geologic and geophysical logs from a borehole adjacent to the seismic lines constrain the depth, velocity, and stratigraphic interpretations. We interpret the faults as a minimum 34 km northeast extension of the Axial fault zone from a throughgoing intersection with the left-stepover Reelfoot thrust.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 104
Serial Issue: 5
Title: Northeast-oriented transpression structure in the northern New Madrid seismic zone; extension of a shear zone across the Reelfoot Fault stepover arm
Affiliation: University of Kentucky, Department of Earth and Environmental Sciences, Lexington, KY, United States
Pages: 2587-2596
Published: 201410
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 27
Accession Number: 2014-091610
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N35°00'00" - N37°00'00", W90°00'00" - W88°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201447
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