Some medium properties of the Hohenzollerngraben (Swabian Jura, W. Germany) inferred from QP/QS analysis

Hoang-Trong, Pho

doi:10.1016/0031-9201(83)90104-8

Cited by 12 publications

(1 citation statement)

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“…Besides the divergence, seismic waves lose energy due to the attenuation caused by scattering and intrinsic absorptions along the transmission path. The intrinsic absorption depends on rock type (Assefa et al, 1999), material state (Del Pezzo et al, 1995), temperature (Roth et al, 2000), thermoelasticity (Aki, 1980;Frankel et al, 1990), effects of fluids (Hoang-Trong, 1983), and frictional heating (Fukuchi et al, 2005). On the other hand, scattering attenuation represents loss of energy of a direct wave caused by reflection, refraction, and conversion due to inhomogeneous medium and/or existence of cracks and fractures.…”

Section: Theory and Methodology For Strong-motion Data Analysismentioning

confidence: 97%

Estimation of Source Parameters, Quality Factor (QS), and Site Characteristics Using Accelerograms: Uttarakhand Himalaya Region

Sharma

Chopra

Roy

2013

Bulletin of the Seismological Society of America

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A study of source, path, and site characteristics was conducted for the Uttarakhand Himalaya region using accelerogram data from 15 earthquakes (M L ≥ 3:5). These earthquakes were recorded at the 16-station accelerograph network operated by the Indian Institute of Technology, Roorkee, during 2005-2011. The average seismic moment (M 0 ) of the studied earthquakes ranges between 1:20 × 10 22 and 1:02 × 10 24 dyn·cm, and the average moment magnitude (M w ) is between 4.0 and 5.3. The estimated corner frequency (f c ) varies from 1.1 to 3.3 Hz, radius of rupture (r d ) from 0.5 to 1.4 km, and stress drop (Δσ) from 6 to 172 bars, indicating continuous seismic energy release in the Uttarakhand region. The interdependence between estimated source parameters is shown by determining scaling laws for the studied region. The constant Q 0 of the shear-wave quality factor (Q S Q 0 f n ) varies between 40 and 300 and exponent n varies between 0.85 and 1.5, providing an average relation of Q S 174f 1:27 . However, least-square fitting of the observed data set in the frequency range 0.1-20 Hz gives Q S as 159f 1:16 . The value of Q S demonstrates that the region is heterogeneous, seismically active, and attenuative. The high-frequency spectral falloff factor (γ) varies from 1.3 to 2.1 and the upper crustal attenuation factor (κ) from 0.023 to 0.07 s at different sites, with an average of 0.044 s. The site response characteristics are estimated by horizontal-to-vertical spectral ratio (HVSR) and generalized inversion (GINV) techniques; results obtained from both the techniques show 1:1 correspondence. The site amplification factor varies between 2.3 and 9.4 using HVSR and between 2.6 and 10.9 using GINV among different stations. The predominant frequency ranges from 1.3 to 8.3 Hz with HVSR and from 1.3 to and 9.0 Hz with GINV.

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