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- W2101492786 abstract "Research Article| July 01, 1997 Seismic Interpretation of the Deep Structure of the Wabash Valley Fault System Glenn W. Bear; Glenn W. Bear Department of Geological Sciences Indiana University 1005 East 10th Street Bloomington, IN 47405 (G.W.B.) Search for other works by this author on: GSW Google Scholar John A. Rupp; John A. Rupp Indiana Geological Survey 611 North Cottage Grove Bloomington, IN 47405 (J.A.R.) Search for other works by this author on: GSW Google Scholar Albert J. Rudman Albert J. Rudman Department of Geological Sciences Indiana University 1005 East 10th Street Bloomington, IN 47405 (A.J.R.) Search for other works by this author on: GSW Google Scholar Seismological Research Letters (1997) 68 (4): 624–640. https://doi.org/10.1785/gssrl.68.4.624 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Glenn W. Bear, John A. Rupp, Albert J. Rudman; Seismic Interpretation of the Deep Structure of the Wabash Valley Fault System. Seismological Research Letters 1997;; 68 (4): 624–640. doi: https://doi.org/10.1785/gssrl.68.4.624 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietySeismological Research Letters Search Advanced Search Abstract Interpretations of newly available seismic reflection profiles near the center of the Illinois Basin indicate that the Wabash Valley Fault System is rooted in a series of basement-penetrating faults. The fault system is composed predominantly of north-northeast-trending high-angle normal faults. The largest faults in the system bound the 22-km wide 40-km long Grayville Graben. Structure contour maps drawn on the base of the Mount Simon Sandstone (Cambrian System) and a deeper pre-Mount Simon horizon show dip-slip displacements totaling at least 600 meters across the New Harmony fault. In contrast to previous interpretations, the N-S extent of significant fault offsets is restricted to a region north of 38° latitude and south of 38.35° latitude. This suggests that the graben is not a NE extension of the structural complex composed of the Rough Creek Fault System and the Reelfoot Rift as previously interpreted. Structural complexity on the graben floor also decreases to the south. Structural trends north of 38° latitude are offset laterally across several large faults, indicating strike-slip motions of 2 to 4 km. Some of the major faults are interpreted to penetrate to depths of 7 km or more. Correlation of these faults with steep potential field gradients suggests that the fault positions are controlled by major lithologic contacts within the basement and that the faults may extend into the depth range where earthquakes are generated, revealing a potential link between specific faults and recently observed low-level seismicity in the area. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article." @default.
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- W2101492786 title "Seismic Interpretation of the Deep Structure of the Wabash Valley Fault System" @default.
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