Interpolated Quaternary and Jurassic surfaces below a 4.5 m dextral railroad offset near Summerville, SC

<p>Oblique view of the detrended morphology of the base of the Quaternary encountered in shallow auger holes in a &plusmn;30 km region near Summerville South Carolina (Weems and Lewis, 2002, Weems <em>et al</em>., 2014) and smoothed morphology of the prominent Jurassic reflector from reflection profiles from Chapman and Beales (2011). The smoothed Jurassic reflector is encountered at 560-850 m depth (Vert.= Hor. Scale x50); The Quaternary horizon lies at 3-9 m depth and its vertical scale is exagerrated x 5000.</p> <p>The vertical Summerville/ Gants fault is depicted with two colors. A dislocation model fit to a 4.5 m, 1.5 km scale dextral offset to the railroad (black line crossing the fault) shows that it slipped below &asymp;450 m, and this part of the fault is shaded red.&nbsp; Also shown with a broken dashed line are the eastern and southern edges of the Pneholoway Marine Terrace.</p> <p>The movie rotates about a point near Summerville that was raised by &asymp;1 m in the earthquake, and illustrates the coincidence of the upwarped base of the Quaternary and the Summerville/Gants fault,&nbsp; suggesting that the eastern edge of the Penholoway Terrace has been raised a few meters by earthquakes prior to the 1886 Charleston earthquake.</p>