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1 Department of Earth
Sciences
Carleton University
Ottawa, Ontario K1S 5B6,
Canada
gmatkinson{at}aol.com
(G.M.A.)
2 U.S. Geological Survey
345
Middlefield Rd.
Menlo Park, California
94025
boore{at}usgs.gov
(D.M.B.)
New earthquake ground-motion relations for hard-rock and soil sites in
eastern North America (ENA), including estimates of their aleatory
uncertainty (variability)
have been developed based on a stochastic finite-fault model. The model
incorporates new information obtained from ENA seismographic data
gathered over
the past 10 years, including three-component broadband data that provide new
information
on ENA source and path effects. Our new prediction equations are
similar
to the previous ground-motion prediction equations of
Atkinson and Boore (1995),
which were based on a stochastic point-source model. The main difference is that
high-frequency amplitudes (f 
5 Hz) are less than previously
predicted (by about
a factor of 1.6 within 100 km), because of a slightly lower average stress
parameter
(140 bars versus 180 bars) and a steeper near-source attenuation. At frequencies
less
than 5 Hz, the predicted ground motions from the new equations are generally
within
25% of those predicted by
Atkinson and Boore (1995). The
prediction equations
agree well with available ENA ground-motion data as evidenced by
near-zero average
residuals (within a factor of 1.2) for all frequencies, and the lack of any
significant
residual trends with distance. However, there is a tendency to positive
residuals for
moderate events at high frequencies in the distance range from 30 to 100 km (by
as
much as a factor of 2). This indicates epistemic uncertainty in the prediction
model.
The positive residuals for moderate events at <100 km could be eliminated by an
increased stress parameter, at the cost of producing negative residuals in other
magnitude-distance ranges; adjustment factors to the equations are provided that
may
be used to model this effect.
Online material: Database of response spectra for hard-rock sites in ENA.
This article has been cited by other articles:
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  G. M. Atkinson Ground-Motion Prediction Equations for Eastern North America from a Referenced Empirical Approach: Implications for Epistemic Uncertainty Bulletin of the Seismological Society of America, June 1, 2008; 98(3): 1304 - 1318. [Abstract] [Full Text] [PDF]
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 G. M. Atkinson, S. I. Kaka, D. Eaton, A. Bent, V. Peci, and S. Halchuk A Very Close Look at a Moderate Earthquake near Sudbury, Ontario Seismological Research Letters, January 1, 2008; 79(1): 119 - 131. [Full Text] [PDF]
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Z. Wang and M. Zhou Comment on "Why Do Modern Probabilistic Seismic-Hazard Analyses Often Lead to Increased Hazard Estimates?" by Julian J. Bommer and Norman A. Abrahamson Bulletin of the Seismological Society of America, December 1, 2007; 97(6): 2212 - 2214. [Full Text] [PDF]
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H. P. Hong and K. Goda Orientation-Dependent Ground-Motion Measure for Seismic-Hazard Assessment Bulletin of the Seismological Society of America, October 1, 2007; 97(5): 1525 - 1538. [Abstract] [Full Text] [PDF]
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T. I. Allen, P. R. Cummins, T. Dhu, and J. F. Schneider Attenuation of Ground-Motion Spectral Amplitudes in Southeastern Australia Bulletin of the Seismological Society of America, August 1, 2007; 97(4): 1279 - 1292. [Abstract] [Full Text] [PDF]
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G. M. Atkinson and D. M. Boore Earthquake Ground-Motion Prediction Equations for Eastern North America Bulletin of the Seismological Society of America, June 1, 2007; 97(3): 1032 - 1032. [Full Text] [PDF]
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