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Frequency-dependent seismic attenuation in the Eastern United States as observed from the 2011 central Virginia earthquake and aftershock sequence

Daniel E. McNamara, Lind S. Gee, Harley M. Benz and Martin Chapman
Frequency-dependent seismic attenuation in the Eastern United States as observed from the 2011 central Virginia earthquake and aftershock sequence
Bulletin of the Seismological Society of America (February 2014) 104 (1): 55-72

Abstract

Ground shaking due to earthquakes in the eastern United States (EUS) is felt at significantly greater distances than in the western United States (WUS) and for some earthquakes it has been shown to display a strong preferential direction. Shaking intensity variation can be due to propagation path effects, source directivity, and/or site amplification. In this paper, we use S and Lg waves recorded from the 2011 central Virginia earthquake and aftershock sequence, in the Central Virginia Seismic Zone, to quantify attenuation as frequency-dependent Q(f). In support of observations based on shaking intensity, we observe high Q values in the EUS relative to previous studies in the WUS with especially efficient propagation along the structural trend of the Appalachian mountains. Our analysis of Q(f) quantifies the path effects of the northeast-trending felt distribution previously inferred from the U.S. Geological Survey (USGS) "Did You Feel It" data, historic intensity data, and the asymmetrical distribution of rockfalls and landslides.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 104
Serial Issue: 1
Title: Frequency-dependent seismic attenuation in the Eastern United States as observed from the 2011 central Virginia earthquake and aftershock sequence
Affiliation: U. S. Geological Survey, Denver, CO, United States
Pages: 55-72
Published: 201402
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 77
Accession Number: 2014-018560
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N36°34'60" - N39°28'00", W83°34'60" - W75°15'00"
Secondary Affiliation: Virginia Polytechnic Institute and State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201412
Program Name: USGSOPNon-USGS publications with USGS authors
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