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GEOREF RECORD

Geology, geotechnical engineering, and natural hazards of Memphis, Tennessee, USA

Abstract

The generally flat landscape of the Memphis, TN, area hides a fascinating geologic history. Cambrian rifting resulted in the concealed faults of the Reelfoot rift, currently the active component of the New Madrid Seismic Zone, lying immediately northwest of the city. Memphis also sits within the Mississippi Embayment. Subsidence of the embayment brought about deposition of the thick Late Cretaceous and Cenozoic sedimentary sequence underlying the city. This sequence provides one of the finest groundwater aquifers in the world, the Memphis Sand. Pliocene ancestral Ohio River alluvium (Upland Complex) is an excellent source of sand and gravel for the region. Plio-Pleistocene fluvial degradation by the Mississippi River and its tributaries, in addition to deposition of Pleistocene loess sheets, have produced the subtle topography of Memphis and Shelby County. Memphis geology makes geotechnical engineering design challenging because loess is highly sensitive to disturbance. Exploratory sampling techniques tend to cause disturbance to loess during sampling and sample extraction. Thus, conventional sampling techniques yield variable engineering property test results (e.g., strength and compressibility). The city of Memphis and Shelby County have together become a major commodities distribution center for the United States, North America, and the global economy. The principal natural hazards are the frequent severe weather and the prospect of a repeat of the >7M 1811-1812 New Madrid earthquakes. These unavoidable exposures to severe weather, urban and riverine flooding, and earthquakes combined with social conditions tend to amplify the consequences of hazard events.


ISSN: 1078-7275
EISSN: 1558-9161
Coden: ENGEA9
Serial Title: Environmental & Engineering Geoscience
Serial Volume: 18
Serial Issue: 2
Title: Geology, geotechnical engineering, and natural hazards of Memphis, Tennessee, USA
Affiliation: University of Memphis, Department of Earth Sciences, Memphis, TN, United States
Pages: 113-158
Published: 201205
Text Language: English
Publisher: Association of Environmental & Engineering Geologists and The Geological Society of America, College Station, TX, United States
References: 130
Accession Number: 2012-056711
Categories: Engineering geologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, geol. sketch maps
N34°58'60" - N35°23'60", W90°17'60" - W89°40'00"
Secondary Affiliation: Fugro Atlantic, USA, United StatesMemphis Stone & Gravel Company, USA, United StatesU. S. Census Bureau, USA, United StatesEncana Oil & Gas, USA, United StatesUniversity of Kentucky, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Association of Engineering Geologists and the Geological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201229
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