Near-source attenuation of high-frequency body waves beneath the New Madrid Seismic Zone

Pezeshk, Shahram; Sedaghati, Farhad; Nazemi, Nima

doi:10.1007/s10950-017-9717-6

Cited by 13 publications

(2 citation statements)

References 74 publications

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“…There are several applications of the stochastic method within earthquake engineering and seismology. Tavakoli and Pezeshk (2005) and Pezeshk et al (2011Pezeshk et al ( , 2015Pezeshk et al ( , 2018 used the stochastic method as part of the hybrid empirical method (HEM) introduced by Campbell (2003) to develop GMMs for the CENA using the empirical ground-motion prediction equations for Western North America (WNA). The HEM is used to map empirical estimates of ground motion from a region with numerous strong-motion recordings (the host region) to be suitable for a region with sparse strong-motion recordings (the target region).…”

Section: Applications Of the Stochastic Methodsmentioning

confidence: 99%

An equivalent point-source stochastic model of the NGA-East ground-motion models

Pezeshk,

Assadollahi,

Zandieh

2024

Earthquake Spectra

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The main objective of this study is to estimate seismological parameters in Central and Eastern North America (CENA), including the geometrical spreading, anelastic attenuation, stress parameter, and site attenuation parameters. In this study, we use particle swarm optimization (PSO) to invert a weighted average of the median 5%-damped pseudo-spectral acceleration (PSA) predicted from the Next Generation Attenuation-East (NGA-East) ground-motion models (GMMs) to develop a point-source stochastic GMM with a well-constrained set of ground-motion parameters. Magnitude-specific inversions are performed for moment magnitude ranges M = 4.0–8.0, rupture distances Rrup = 1–1000 km, and periods T = 0.01–10 s, and National Earthquake Hazard Reduction Program site class A conditions. The result of this study yields a single stochastic GMM that yields PSA values similar to the median NGA-East GMMs. The parameters derived from this study can be used for the hybrid empirical method (HEM) applications. This study is the first to perform a formal inversion using the GMMs developed for the NGA-East project. The approach has been validated using simulated small-to-moderate magnitude and large-magnitude data derived from the NGA-West2 GMMs.

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Section: Applications Of the Stochastic Methodsmentioning

confidence: 99%

An equivalent point-source stochastic model of the NGA-East ground-motion models

Pezeshk,

Assadollahi,

Zandieh

2024

Earthquake Spectra

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“…For the USArray seismic stations located near CUSSO, we find Lg phases that are highly attenuated (Q Lg phase is 200; , and Lg horizontal motion is amplified in the frequency band 0.5-4.5 Hz, while the Lg vertical amplification varies as a function of frequency: for f < 2.5 Hz, Lg is amplified, and for f > 2.5 Hz, Lg is de-amplified (Yassminh et al, 2019). Specifically, across the NMSZ for earthquakes distance less than 500 km, the horizontal and vertical QLg were estimated to be 390 and 410 for f > 3 Hz, respectively (Bisrat et al, 2014;Langston, 2003;Nazemi et al, 2017;Pezeshk et al, 2018). For high frequency body waves (P and S), site amplification is more significant than path-based attenuation in the Mississippi embayment.…”

Section: Discussionmentioning

confidence: 99%

Regional site response and uppermost mantle seismic structure of central and eastern united states

Yassminh¹

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This dissertation examines seismological data from regional earthquake sources in order to examine the seismological character of the crust and uppermost mantle in central and eastern United States. Firstly, site amplification of regional highfrequency Lg seismic phases is estimate ed using a Reverse-Two Station (RTS) method. RTS results show topography and sediment thickness are likely to affect amplification and both factors likely frequency-dependent. There is a negative correlation between the RTS-measured amplification and shallow shear-wave velocity. It appears that both regional topography (i.e., long-wavelength topography) and deeper subsurface seismic structures (basins and sediments) have a large impact on site amplification. Subsequently, Pn and Sn travel time tomography is used to estimate the upper most mantle P-wave (Pn) velocity, S-wave (Sn) velocity, and the velocity ratio (VPn/VSn). In addition to velocity, effective attenuation of Sn phase (Q[superscript -1]sn) is also measured. The result shows regions of high velocity such as southern Georgia, eastern South Carolina and NMSZ and low Q[subscript Sn] values. The V[subscript Pn]/V[subscript Sn] ratio shows values higher than the average in regions such as the Mississippi Embayment, New England, and south Appalachian. V[subscript Pn]/V[subscript Sn] ratios are lower than the average in regions such as northwestern CEUS, South Georgia and eastern Texas. We estimated the uppermost mantle temperature by applying a constrained grid-search algorithm includes the observed V[subscript Sn], V[subscript Pn] and Q[subscript Sn] with the calculated velocities of specific compositional models. The uppermost mantle temperature result, [about]300-500C, beneath the northern mid-continent, and the highest temperature, 1100 C, beneath New England

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Investigation of coda and body wave attenuation functions in Central Asia

et al. 2019

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Near-source attenuation of high-frequency body waves beneath the New Madrid Seismic Zone

Cited by 13 publications

References 74 publications

An equivalent point-source stochastic model of the NGA-East ground-motion models

An equivalent point-source stochastic model of the NGA-East ground-motion models

Regional site response and uppermost mantle seismic structure of central and eastern united states

Investigation of coda and body wave attenuation functions in Central Asia

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