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This is the first technical report of a two-year study of the geology of the Lake Monti cello region, South Carolina. This work was undertaken in order to determine the geological factors responsible for the induced seismic activity at Lake Monti cello. During the period 3/1/80-9/1/80 we 1) conducted geological field mapping in -the Chapin, Little Mountain, and Jenkinsville quadrangles, 2) measured a detailed magnetic profile across the Chapin and Little Mountain quadrangles, and 3) measured the orientations of approximately 4200 joint fractures at 39 different stations in the Chapin, Little Mountain, Jenkinsville, and Pomaria quadrangles. We have distinguished ten distinctive lithologic units in the rocks of the study area, and preliminary geologic maps showing the distribution of these units are presented for the Chapin, Little Mountain and portions of the Jenkinsville quadrangles. The rocks of the study area were strongly deformed during the Early to Mid Paleozoic. As a result of this deformation, Tnany of the lithologic units contain a strong metamorphic foliation, and were folded into a tight syncline, the axis of which passes through the southern parts of the Chapin and Little Mountain quadrangles. During the Late Paleozoic, the rocks in the study area were again deformed during one or more episodes of flexural folding and a series of large adamellite piutons were emplaced in the northern parts of the study area. The latest Paleozoic and Mesozoic history of the area was characterized by brittle faulting and by the emplacement of northwest trending diabase dikes. During this period it appears that a north trending fault (the Wateree Creek fault) developed in the central part of the Chapin quadrangle. The latest movement on the Wateree Creek fault may postdate the emplacement of the diabase dikes of Jurassic (?) age. The Wateree Creek fault trends in the general direction of Lake Monticello and may be an important factor in the induced seismic activity at Lake Monticello. Additional geological studies are being conducted in an attempt to further document the extent and geological history of the Wateree Creek fault. It is emphasized that the conclusions presented here are tentative and subject to change as the work progresses.

Geological studies in an area of induced seismicity at Monticello Reservoir, South Carolina