|
|
||||||||
U.S. Geological Survey, Box 25046 MS966, Denver, Colorado 80225
U.S. Geological Survey, MS 977, 345 Middlefield Road, Menlo Park, California 94025
Abstract
Measurements of the Fourier amplitude spectra of Lg phases recorded at high frequency (0.5 to 14.0 Hz) by broadband seismic stations are used to determine regional attenuation relationships for southern California, the Basin and Range Province, the central United States, and the northeastern United States and southeastern Canada. Fourier spectral amplitudes were measured every quarter octave from Lg phases windowed between 3.0 and 3.7 km sec1 and recorded in the distance range of 150 to 1000 km. Attenuation at each frequency is determined by assuming a geometrical spreading exponent of 0.5 and inverting for Q and source and receiver terms. Both southern California and the Basin and Range Province are well described by low Lg Q and frequency-dependent attenuation. Lg spectral amplitudes in southern California are fit at low frequencies (0.625 to 0.875 Hz) by a constant Lg Q of 224 and by a frequency-dependent Lg Q function Q = 1877+7f0.55(±0.03) in the frequency band 1.0 to 7.0 Hz. The Basin and Range Province is characterized by a constant Lg Q of 192 for frequencies of 0.5 to 0.875 Hz and by the frequency-dependent Lg Q function Q = 23511+11f0.56(±0.04) in the frequency band 1.0 to 5.0 Hz. A change in frequency dependence above 5.0 Hz is possible due to contamination of the Lg window by Pn and Sn phases. Lg spectral amplitudes in the central United States are fit by a mean frequency-independent Lg Q of 1291 for frequencies of 1.5 to 7.0 Hz, while a frequency-dependent Lg Q of Q = 105283+91(f/1.5)0.22(±0.06) fits the Lg spectral amplitudes for the northeastern United States and southeastern Canada over the passband 1.5 to 14.0 Hz. Attenuation measurements for these areas were restricted to frequencies >1.5 Hz due to larger microseismic noise levels at the lower frequencies.
This article has been cited by other articles:
![]() |
K.-Y. Chun and G. A. Henderson Lg Attenuation near the North Korean Border with China, Part II: Model Development from the 2006 Nuclear Explosion in North Korea Bulletin of the Seismological Society of America, October 1, 2009; 99(5): 3030 - 3038. [Abstract] [Full Text] [PDF] |
||||
![]() |
G. M. Atkinson and M. Morrison Observations on Regional Variability in Ground-Motion Amplitudes for Small-to-Moderate Earthquakes in North America Bulletin of the Seismological Society of America, August 1, 2009; 99(4): 2393 - 2409. [Abstract] [Full Text] [PDF] |
||||
![]() |
S. R. Ford, D. S. Dreger, K. Mayeda, W. R. Walter, L. Malagnini, and W. S. Phillips Regional Attenuation in Northern California: A Comparison of Five 1D Q Methods Bulletin of the Seismological Society of America, August 1, 2008; 98(4): 2033 - 2046. [Abstract] [Full Text] [PDF] |
||||
![]() |
R. R. Castro, C. Condori, O. Romero, C. Jacques, and M. Suter Seismic Attenuation in Northeastern Sonora, Mexico Bulletin of the Seismological Society of America, April 1, 2008; 98(2): 722 - 732. [Abstract] [Full Text] [PDF] |
||||
![]() |
Q. Miao and C. A. Langston Empirical Distance Attenuation and the Local-Magnitude Scale for the Central United States Bulletin of the Seismological Society of America, December 1, 2007; 97(6): 2137 - 2151. [Abstract] [Full Text] [PDF] |
||||
![]() |
C. K. Saikia, A. Pitarka, and G. A. Ichinose Effects of Irregular Structure of the Mississippi Embayment on Ground-Motion Amplification Bulletin of the Seismological Society of America, August 1, 2006; 96(4A): 1448 - 1473. [Abstract] [Full Text] [PDF] |
||||
![]() |
C. Cramer An Assessment of the Impact of the 2003 EPRI Ground-Motion Prediction Models on the USGS National Seismic-Hazard Maps Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 1159 - 1169. [Abstract] [Full Text] [PDF] |
||||
![]() |
G. I. Aleqabi and M. E. Wysession QLg Distribution in the Basin and Range Province of the Western United States Bulletin of the Seismological Society of America, February 1, 2006; 96(1): 348 - 354. [Abstract] [Full Text] [PDF] |
||||
![]() |
B. Halldorsson and A. S. Papageorgiou Calibration of the Specific Barrier Model to Earthquakes of Different Tectonic Regions Bulletin of the Seismological Society of America, August 1, 2005; 95(4): 1276 - 1300. [Abstract] [Full Text] [PDF] |
||||
![]() |
T. W. Chung, Y. K. Park, I. B. Kang, and K. Lee Crustal in South Korea Using the Source Pair/Receiver Pair Method Bulletin of the Seismological Society of America, April 1, 2005; 95(2): 512 - 520. [Abstract] [Full Text] [PDF] |
||||
![]() |
Frequency-Dependent Lg Q within the Continental United States Bulletin of the Seismological Society of America, October 1, 2004; 94(5): 1630 - 1643. |
||||
![]() |
A. Frankel How Can Seismic Hazard around the New Madrid Seismic Zone Be Similar to That in California? Seismological Research Letters, September 1, 2004; 75(5): 575 - 586. [Full Text] [PDF] |
||||
![]() |
R. L. Street, R. A. Bauer, and E. W. Woolery Short Note: Magnitude Scaling of Prehistorical Earthquakes in the Wabash Valley Seismic Zone of the Central United States Seismological Research Letters, September 1, 2004; 75(5): 637 - 641. [Abstract] [Full Text] [PDF] |
||||
![]() |
The Dependence of PGA and PGV on Distance and Magnitude Inferred from Northern California ShakeMap Data Bulletin of the Seismological Society of America, October 1, 2003; 93(5): 2043 - 2055. |
||||
![]() |
M. C. Chapman, P. Talwani, and R. C. Cannon Ground-Motion Attenuation in the Atlantic Coastal Plain near Charleston, South Carolina Bulletin of the Seismological Society of America, June 1, 2003; 93(3): 998 - 1011. [Abstract] [Full Text] [PDF] |
||||
![]() |
T.-W. Chung and K. Lee A Study of High-Frequency Q (super -1) Lg in the Crust of South Korea Bulletin of the Seismological Society of America, June 1, 2003; 93(3): 1401 - 1406. [Abstract] [Full Text] [PDF] |
||||
![]() |
The 26 January 2001 M 7.6 Bhuj, India, Earthquake: Observed and Predicted Ground Motions Bulletin of the Seismological Society of America, August 1, 2002; 92(6): 2061 - 2079. |
||||
![]() |
Regional Estimates of Radiated Seismic Energy Bulletin of the Seismological Society of America, May 1, 2002; 92(4): 1241 - 1255. |
||||
![]() |
M. Raoof, R. B. Herrmann, and L. Malagnini Attenuation and excitation of three-component ground motion in southern California Bulletin of the Seismological Society of America, August 1, 1999; 89(4): 888 - 902. [Abstract] [PDF] |
||||
![]() |
J. Xie Spectral inversion of Lg from earthquakes: A modified method with applications to the 1995, western Texas earthquake sequence Bulletin of the Seismological Society of America, December 1, 1998; 88(6): 1525 - 1537. [Abstract] [PDF] |
||||
![]() |
R. A. W. Haddon Reply to comment by G. M. Atkinson, et al. on "Earthquake source spectra in eastern North America" by R. A. W. Haddon Bulletin of the Seismological Society of America, December 1, 1997; 87(6): 1703 - 1708. [PDF] |
||||
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |