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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2004-5082

Preliminary Investigation of Structural Controls of Ground-Water Movement in Pipe Spring National Monument, Arizona

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Prepared in cooperation with the
NATIONAL PARK SERVICE

By Margot Truini, J.B. Fleming, and H.A. Pierce

ABSTRACT

Pipe Spring National Monument, near the border of Arizona and Utah, includes several low-discharge springs that are the primary natural features of the monument. The National Park Service is concerned about the declines in spring discharge. Seismic-refraction and frequency-domain electromagnetic-induction methods were employed in an attempt to better understand the relation between spring discharge and geologic structure. The particular method used for the seismic-refraction surveys was unable to resolve structural features in the monument. Electromagnetic surveys delineated differences in apparent conductivity of the shallow subsurface deposits. The differences are attributable to differences in saturation, lithology, and structure of these deposits.

CONTENTS

Abstract
Introduction
Hydrogeologic setting
Geophysical methods
Structural controls of ground-water movement
Summary and conclusions
Selected references



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