Coda Q in the southern Appalachians

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Geophysical Research Letters (American Geophysical Union); (USA)

DOI:https://doi.org/10.1029/GL016i006p00531· OSTI ID:5668036

Chapman, M C; Rogers, M J.B. ^[1]

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1. Virginia Polytechnic Institute and State Univ., Blacksburg (USA)

The attenuation of seismic code waves in the Southern Appalachian region was studied. Signal sources were five local and regional earthquakes and one explosion located in Ohio, Virginia and South Carolina. The data were recorded digitally by a network of seven stations in western Virginia. Joint least squares estimates of the quality factor Q, relative recording site responses and coda source amplitudes were obtained in five frequency bands using the single scattering model, and assuming body wave geometrical spreading. The results indicate a frequency dependent coda Q, represented by Q = 811 f{sup 0.42}, 1.5 {le} f {le} 12 Hz, for lapse times in the range 1.5 to 2.50 seconds. Site responses determined relative to the average network response differ by less than a factor of 2 in the range 3 to 12 Hz at five of the seven stations. However, the differences in the response of the other two sites increase with frequency, amount in to a factor of 5 at 12 Hz. Estimated relative coda source amplitude spectra exhibit similar shapes, consistent with the assumption that the scattering process is independent of path in the study region.

• OSTI ID: 5668036
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 16:6; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
AMPLITUDES
APPALACHIAN BASIN
ATTENUATION
DEVELOPED COUNTRIES
EARTHQUAKES
EXPLOSIONS
FEDERAL REGION III
FEDERAL REGION IV
FEDERAL REGION V
FREQUENCY DEPENDENCE
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
NORTH AMERICA
OHIO
SEDIMENTARY BASINS
SEISMIC EVENTS
SEISMIC SOURCES
SEISMIC SURVEYS
SEISMIC WAVES
SOUTH CAROLINA
SURVEYS
TIME DEPENDENCE
USA
VIRGINIA