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GEOREF RECORD

Factors influencing the distribution of debris avalanches associated with the 1969 Hurricane Camille in Nelson County, Virginia

Jeffrey J. Gryta and Mervin J. Bartholomew
Factors influencing the distribution of debris avalanches associated with the 1969 Hurricane Camille in Nelson County, Virginia (in Landslide processes of the Eastern United States and Puerto Rico, Arthur P. Schultz (editor) and Randall W. Jibson (editor))
Special Paper - Geological Society of America (1989) 236: 15-28

Abstract

Examination of the central Virginia Blue Ridge shows that both regional and local factors affected the development of 1,107 debris avalanches during Hurricane Camille in 1969. Major factors influencing the triggering of debris avalanches were rainfall, topographic relief, and contrasting lithologic associations between the Pedlar massif with its metavolcanic cover and the Lovingston massif. Within areas of high rainfall and high chute density, secondary factors affect the susceptibility of individual rock units and chute orientations within those rock units. Units that have high to moderate susceptibility generally have a prominent biotite or amphibole foliation and/or multiple rock fabrics (compositional layering and foliation). Units showing a moderate to low susceptibility are generally more massive and/or lack a well-defined biotite foliation. Rock fabrics influenced preferred chute orientations in most rock types. Chute azimuths are moderately concentrated within a 75 degrees arc between N60 degrees E and S45 degrees E, subparallel to the direction of dip of the regional foliation. These Camille results suggest that most of the Pedlar massif has a moderate susceptibility to shallow-seated landsliding. By contrast, the topographically rugged areas of the Lovingston massif have high to moderate susceptibility.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 236
Title: Factors influencing the distribution of debris avalanches associated with the 1969 Hurricane Camille in Nelson County, Virginia
Title: Landslide processes of the Eastern United States and Puerto Rico
Author(s): Gryta, Jeffrey J.Bartholomew, Mervin J.
Author(s): Schultz, Arthur P.editor
Author(s): Jibson, Randall W.editor
Affiliation: Kent State Univ., Dep. Geol., Kent, OH, United States
Affiliation: U. S. Geol. Surv., Reston, VA, United States
Pages: 15-28
Published: 1989
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2236-5
References: 34
Accession Number: 1989-062171
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N37°31'60" - N38°02'60", W79°10'00" - W78°37'60"
Secondary Affiliation: Mont. Coll. Miner., Sci. and Technol., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
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