36. This view shows a 0.7-m-wide dike from lateral spreading along the banks of the Wabash River. Site was not modified by man before photograph was taken. White vertical scale in slide is 1 m. Sand and gravel were vented onto the ground surface in the earthquake of 6,100 yr BP; subsequently, after the earthquake, about 1 m of overbank silty clay was deposited onto the vented sediment as a result of frequent flooding. The vented sand and gravel portion is the dark, thin band parallel to the modern ground surface. Six dikes of width exceeding 0.5 m were found at scattered sites in the meizoseismal zone of the 6,100 yr BP earthquake. The widest dike was 2.5 m. (Slide courtesy of Cheryl A. Munson, Indiana University.)