Skip to Main Content
GEOREF RECORD

Coulomb stress transfer and modeled permanent vertical surface deformation from the August 2011, Mineral, Virginia, earthquake

Lisa Schleicher Walsh, Laurent G. J. Montesi and Aaron J. Martin
Coulomb stress transfer and modeled permanent vertical surface deformation from the August 2011, Mineral, Virginia, earthquake (in The 2011 Mineral, Virginia, earthquake, and its significance for seismic hazards in eastern North America, J. Wright Horton (editor), Martin C. Chapman (editor) and Russell A. Green (editor))
Special Paper - Geological Society of America (2015) 509: 305-329

Abstract

Occurring only 13 months apart, the moment magnitude, M (sub w) 3.4 Germantown, Maryland (16 July 2010), and M (sub w) 5.8 Mineral, Virginia (23 August 2011), earthquakes rocked the U.S. national capital region, drawing renewed attention to the occurrence of intraplate seismicity in the Mid-Atlantic region of the eastern United States. We model the Coulomb stress transferred by these earthquakes to fault zones in the Mid-Atlantic region that were active during the Cenozoic. In most cases, the Mineral earthquake brought these preexisting Cenozoic faults further from failure. This unloading, like all changes in stress located more than 30 km from the epicenter, was very small ( approximately 1-3 mbar) and therefore unlikely to affect the occurrence of earthquakes at the regional scale. Between 30 and 15 km away, however, the maximum Coulomb failure stress change ranged one to three orders of magnitude greater ( approximately 0.05-6 bar), levels on par with the stress changes that triggered historical earthquakes in California. The Mineral earthquake generated an increase in Coulomb failure stress of approximately 0.5 bar 10 km from the rupture, approximately 5 bar 5 km from the rupture, and approximately 20 bar at the edge of the rupture on receiver faults oriented like the mainshock. The geographic location of the aftershock-defined Northwest fault in the epicentral region may be explained by Coulomb stress transfer from the mainshock. Elastic dislocation modeling of surface deformation caused by the Mineral earthquake indicates a maximum of approximately 7 cm of permanent vertical surface displacement directly above the center of the rupture.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 509
Title: Coulomb stress transfer and modeled permanent vertical surface deformation from the August 2011, Mineral, Virginia, earthquake
Title: The 2011 Mineral, Virginia, earthquake, and its significance for seismic hazards in eastern North America
Author(s): Walsh, Lisa SchleicherMontesi, Laurent G. J.Martin, Aaron J.
Author(s): Horton, J. Wright, Jr.editor
Author(s): Chapman, Martin C.editor
Author(s): Green, Russell A.editor
Affiliation: University of Maryland, Department of Geology, College Park, MD, United States
Affiliation: U. S. Geological Survey, Reston, VA, United States
Pages: 305-329
Published: 2015
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 140
Accession Number: 2015-036175
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 6 tables, geol. sketch maps
N37°43'00" - N38°10'00", W78°19'60" - W77°40'00"
N38°55'60" - N39°21'00", W77°31'60" - W76°52'60"
Secondary Affiliation: Virginia Polytechnic Institute and State University, Department of Geosciences, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201517
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal