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ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION COAST AND GEODETIC SURVEY, ROCKVILLE, MARYLAND 20852
DEPARTMENT OF GEOPHYSICS AND GEOPHYSICAL ENGINEERING SAINT LOUIS UNIVERSITY, ST. LOUIS, MISSOURI 63156
Abstract
The November 9, 1968 earthquake in south-central Illinois occurred in the New Madrid zone, a seismic zone associated with northeast-trending geological structure. Landforms in the epicentral area consist of nearly flat, glacial lake plains surrounding low, loess-covered hills. An extensive post office canvass and a field inspection of the epicentral area indicate that the strongest shaking (MM VII) took place in the Wabash and Ohio Valleys and adjacent lowlands of south-central Illinois. Characteristic damage included broken chimneys, fallen plaster, and occasional instances of collapsed parapets and overthrown tombstones. Observed rotations of tombstones and other objects in the epicentral area suggest a quadrant distribution of clockwise and counter-clockwise rotations.
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