Crustal attenuation and site effects at Parkfield, California

Abercrombie, Rachel E.

doi:10.1029/1999jb900425

Cited by 34 publications

(30 citation statements)

References 30 publications

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“…Abercrombie (1997) suggested that if the frequency independent Q is the case, then the spectral ratios between two different recording depths will have a linear slope on a log-linear plot. This kind of analysis has been successfully used by numerous researchers such as Hauksson et al (1987), Aster and Shearer (1991), Abercrombie (2000), and Wang et al (2012). These studies show that the shear-wave exponential attenuation models show the linear nature of a log spectral ratio generally appearing in the frequency band of 2 -30 or 40 Hz, and suggest weak frequency dependence of Q in this frequency band.…”

Section: Spectral Ratio Methodsmentioning

confidence: 98%

“…In past decades several studies on earthquake engineering have used downhole instruments for analyzing near-surface V and Q values (Liu et al 1992;Fletcher 1995;Jongmans and Malin 1995;Abercrombie 1997). The optimal and simplest method for investigating V and Q values is comparing recordings from wellhead and borehole stations, which can eliminate the unknown source effect and straightforwardly estimate the Q and V on the connecting path (Abercrombie 2000;Wang et al 2012). Since 2007, the Central Weather Bureau (CWB) of Taiwan has developed more than 30 borehole stations throughout Taiwan to improve the quality of recorded seismic signals and reduce the level of background noise.…”

Section: Introductionmentioning

confidence: 99%

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Near-Surface Attenuation and Velocity Structures in Taiwan from Wellhead and Borehole Recordings Comparisons

Wang¹,

Fong²,

Wu³

et al. 2016

Terr. Atmos. Ocean. Sci.

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By analyzing the data from 28 seismic borehole stations deployed by the Central Weather Bureau Seismic Network throughout Taiwan from 2007 to 2014, we estimated the near-surface velocity (Vp and Vs) and attenuation (Qp and Qs) structures from surface to depths of approximately 300 m. To ensure that the deeper recordings were on the ray path between the seismic source and upper receiver, only events with an incidence angle of less than 35° were selected. Local magnitudes of analyzed events were between 1.1 and 6.6. The subsurface Qp and Qs were well modeled in the 5 -40 Hz frequency band using the spectral ratio of direct P-and S-waves, respectively, at each station, under frequency-independent Q and ω 2 source model assumptions. The estimated Vp in the Coastal Plain, the Western Foothills, the Longitudinal Valley, and the Yilan Plain were approximately 1000 -2000 m s -1 , which was lower than the Vp of 2500 -4000 m s -1 in the Central Mountain Range. In addition, the Vs in the plain areas were lower than that in the Central Mountain Range. The low Vp and Vs and high Vp/Vs ratio in the Coastal Plain and the Western Foothills can be attributed to the unconsolidated soil and high pore-fluid content of subsurface sediments in the plain areas. In contrast to the velocity distribution, low Qp and Qs were observed in the Central Mountain Range. The low Qp and Qs with low Vp/Vs and low Qs/Qp ratios in the Central Mountain Range was consistent with the high thermal temperature observed in the field investigation. The obtained velocity and attenuation structures near surface could also provide important constraints in validation of the crustal structure of Taiwan.

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Section: Spectral Ratio Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Near-Surface Attenuation and Velocity Structures in Taiwan from Wellhead and Borehole Recordings Comparisons

Wang¹,

Fong²,

Wu³

et al. 2016

Terr. Atmos. Ocean. Sci.

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“…Abercrombie (1997) used borehole recordings to determine spectral ratios of direct P-to S-waves and found that they are well modeled with a frequency-independent Q P distribution in the borehole increasing from Q P $ 26-133 at depths between the upper 300 m and 1.5-3 km. Abercrombie (2000), in another borehole study near the San Andreas Fault, found that attenuation on the northeastern side of the fault is about twice that on the southwestern side. Abercrombie (2000), in another borehole study near the San Andreas Fault, found that attenuation on the northeastern side of the fault is about twice that on the southwestern side.…”

Section: Q or Attenuation Determinations For Seismic Waves In The Crustmentioning

confidence: 95%

Deep Earth Structure – Q of the Earth from Crust to Core

Romanowicz¹,

Mitchell²

2007

Treatise on Geophysics

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“…Q associated with strong motion is different from seismological measurements because the typical seismological Lg and Coda wave estimates of Q sample different volumes of the crust surrounding the station and different paths than typical propagation paths of strong-motion signals (Trifunac, 1994) (Abercrombie, 2000).…”

Section: G3=anelastic Attenuationmentioning

confidence: 99%

Update of the Graizer-Kalkan ground-motion prediction equations for shallow crustal continental earthquakes

Graizer¹,

Kalkan²

2015

Open-File Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS (1-888-275-8747) For an overview of USGS information products, including maps, imagery, and publications, visit http: //www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Graizer, V., and Kalkan, E., 2015, Update of the Graizer-Kalkan ground-motion prediction equations for shallow crustal continental earthquakes: U.S. Geological Survey Open-File Report 2015-1009, 79 p., http://dx.doi.org/10.3133/ofr20151009. ISSN 2331ISSN -1258 iii AcknowledgmentsWe wish to thank Martin Chapman, Jon Ake, and Dogan Seber for fruitful discussions on different aspects of ground-motion attenuation. Special thanks are extended to Stephen Harmsen and Nick Gregor for independent testing of our model. David Boore, Art Frankel, Kuo-Wan Lin, and Nilesh Shome have reviewed the material presented in this report; their valuable comments and suggestions helped to improve its technical quality and presentation. We also thank Paul Spudich for his help with mixed-effects residuals analysis, Jessica Dyke for her editing, and Brad Aagaard for his final review. (2015) Site-specific 5-percent damped pseudo spectral acceleration (SA) response spectra generated using the MatLAB code in appendix C for a vertically dipping strike-slip magnitude (M) 6.0 earthquake at closest fault distance to rupture plane (R)=4. AbstractA ground-motion prediction equation (GMPE) for computing medians and standard deviations of peak ground acceleration and 5-percent damped pseudo spectral acceleration response ordinates of maximum horizontal component of randomly oriented ground motions was developed by Kalkan (2007, 2009) to be used for seismic hazard analyses and engineering applications. This GMPE was derived from the greatly expanded Next Generation of Attenuation (NGA)-West1 database. In this study, Graizer and Kalkan's GMPE is revised to include (1) an anelastic attenuation term as a function of quality factor (Q 0 ) in order to capture regional differences in large-distance attenuation and (2) a new frequency-dependent sedimentary-basin scaling term as a function of depth to the 1.5-km/s shear-wave velocity isosurface to improve ground-motion predictions for sites on deep sedimentary basins. The new model (GK15), developed to be simple, is applicable to the western United States and other regions with shallow continental crust in active tectonic environments and may be used for earthquakes with moment magnitudes 5.0-8.0, distances 0-250 ...

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Crustal attenuation and site effects at Parkfield, California

Cited by 34 publications

References 30 publications

Near-Surface Attenuation and Velocity Structures in Taiwan from Wellhead and Borehole Recordings Comparisons

Near-Surface Attenuation and Velocity Structures in Taiwan from Wellhead and Borehole Recordings Comparisons

Deep Earth Structure – Q of the Earth from Crust to Core

Update of the Graizer-Kalkan ground-motion prediction equations for shallow crustal continental earthquakes

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