Geophysical modeling of the Franklin Township buried valley, and associated aquifer, Portage County, Ohio

Conference · Wed Jan 01 04:00:00 EST 1992 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:5973439

Yan, Yuejun; Palmer, D F ^[1]

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1. Kent State Univ., OH (United States). Dept. of Geology

A detailed geophysical survey was conducted in Franklin Township, Portage County, Ohio to delineate a buried valley. A combination of the gravity, electrical resistivity, and surface refraction seismic modeling has been applied to determine the bedrock topography, the lithology of the bedrock, the nature of the glacial fill, and the thickness of the associated aquifer. Three dimensional gravity modeling defines the size and shape of the glacial fill with low density compared to the surrounding bedrock and provides a bedrock topography map with a high resolution. The calculated bedrock topography coincides with the water well data available in the area. Resistivity modeling was used to search for a least-squares fit between the measured and the theoretical curves to evaluate the layer thickness and resistivity. The resistivity profile indicates that there exists an aquifer with the thickness about 50 feet within the glacial fill. The level of the soil moisture and the water table is suggested by the resistivity data as well. The seismic profile supports the bedrock boundary calculated by gravity modeling, and shows that the upper part of the bedrock consists of three layers, upper sandstone, shale, and lower sandstone. The comprehensive geophysical interpretation infers that the pre-glacial valley, cut through Sharon Sandstone, Meadville Shale to Berea Sandstone, was extended and deepened at the northern end, and filled with glacial material derived from the north during the later glacial period, resulting in a thick aquifer in the glacial fill.

• OSTI ID: 5973439
• Report Number(s): CONF-921058--
• Conference Information: Journal Name: Geological Society of America, Abstracts with Programs; (United States) Journal Volume: 24:7
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
AQUIFERS
BASEMENT ROCK
BOUNDARY CONDITIONS
DEPTH
DEVELOPED COUNTRIES
DIMENSIONS
ELECTRICAL SURVEYS
GEOLOGIC FORMATIONS
GEOLOGIC MODELS
GEOLOGY
GEOPHYSICAL SURVEYS
GRAVITY SURVEYS
LITHOLOGY
NORTH AMERICA
OHIO
PETROLOGY
RESISTIVITY SURVEYS
SEISMIC SURVEYS
SURVEYS
USA
VALLEYS